diff --git a/README.md b/README.md
index 6e9f84c..a4a095b 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 # LinuxCNC Web/WASM
 
+五轴机床 INI 参数化设计（XYZAC / XYZBC）的当前工作入口：
+[`项目文档、任务矩阵与验收证据`](docs/trt-parametric/README.md)。本专项按该索引接续。
+
 本仓库的目标是将 LinuxCNC `2.10.0~pre0` 的仿真行为移植到浏览器。当前已完成 posemath/TP、rs274ngc interpreter 和 fixed-tick motion queue 核心切片；这仍不是 LinuxCNC 全功能完成声明。
 
 完整仿真功能范围、任务分解和 M0-M8 里程碑见 [`完整仿真移植实施计划`](docs/linuxcnc-web-wasm-complete-simulation-plan.md)；技术实施接续入口为 [`nextTask1.md`](nextTask1.md)。
diff --git a/coverage/trt-parametric/browser.report.json b/coverage/trt-parametric/browser.report.json
new file mode 100644
index 0000000..2359e5c
--- /dev/null
+++ b/coverage/trt-parametric/browser.report.json
@@ -0,0 +1,73 @@
+{
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+}
diff --git a/coverage/trt-parametric/failure.png b/coverage/trt-parametric/failure.png
new file mode 100644
index 0000000..a5aef68
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diff --git a/coverage/trt-parametric/layout-1440.png b/coverage/trt-parametric/layout-1440.png
new file mode 100644
index 0000000..767fc94
Binary files /dev/null and b/coverage/trt-parametric/layout-1440.png differ
diff --git a/coverage/trt-parametric/layout-390.png b/coverage/trt-parametric/layout-390.png
new file mode 100644
index 0000000..c424dca
Binary files /dev/null and b/coverage/trt-parametric/layout-390.png differ
diff --git a/coverage/trt-parametric/worker.report.json b/coverage/trt-parametric/worker.report.json
new file mode 100644
index 0000000..6e53886
--- /dev/null
+++ b/coverage/trt-parametric/worker.report.json
@@ -0,0 +1,1595 @@
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+              16.452707062156886
+            ]
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+            "joints": [
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+              20.29381346014368
+            ]
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+          {
+            "tick": 121,
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+            "joints": [
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+              22.214366659137085
+            ]
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+          {
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+            "pose": {
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+              "u": 0,
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+            "joints": [
+              3.725882114537516,
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+              16.089946572086987,
+              24.13491985813048
+            ]
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+          {
+            "tick": 141,
+            "pose": {
+              "x": 10.422189222849552,
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+              "u": 0,
+              "v": 0,
+              "w": 0
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+              3.925104483940789,
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+              17.37031537141592,
+              26.05547305712388
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+            "tick": 151,
+            "pose": {
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+              "u": 0,
+              "v": 0,
+              "w": 0
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+            "joints": [
+              4.104605440791584,
+              6.798029356063859,
+              12.121634254689384,
+              18.650684170744853,
+              27.97602625611728
+            ]
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+          {
+            "tick": 161,
+            "pose": {
+              "x": 11.913625063560401,
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+              "z": 5.9568125317802005,
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+              "u": 0,
+              "v": 0,
+              "w": 0
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+            "joints": [
+              4.255414604167775,
+              7.415870566552133,
+              12.894767684082103,
+              19.85604177260067,
+              29.784062658901004
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+          {
+            "tick": 171,
+            "pose": {
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+              "y": 8,
+              "z": 6,
+              "a": 0,
+              "b": 20,
+              "c": 30,
+              "u": 0,
+              "v": 0,
+              "w": 0
+            },
+            "joints": [
+              4.272248646388174,
+              7.49038105676658,
+              12.98778096429175,
+              20,
+              30
+            ]
+          }
+        ],
+        "offsets": {
+          "tool_offset": 0,
+          "x_rot_point": 9,
+          "y_rot_point": -7,
+          "z_rot_point": 13,
+          "x_offset": 15,
+          "y_offset": 0,
+          "z_offset": -4
+        },
+        "final": {
+          "tick": 171,
+          "pose": {
+            "x": 12,
+            "y": 8,
+            "z": 6,
+            "a": 0,
+            "b": 20,
+            "c": 30,
+            "u": 0,
+            "v": 0,
+            "w": 0
+          },
+          "joints": [
+            4.272248646388174,
+            7.49038105676658,
+            12.98778096429175,
+            20,
+            30
+          ]
+        },
+        "preview_hash": "fnv1a64:2595e1a5d1cf33eb",
+        "trace_hash": "fnv1a64:f89774102510f899",
+        "model_samples": 4
+      },
+      "repeat_hash": "fnv1a64:f89774102510f899",
+      "first_divergent_tick": 11
+    }
+  ],
+  "state_hash": "fnv1a64:d6d3dd87c1c1c0e2"
+}
diff --git a/coverage/trt-parametric/xyzac-trt-model.png b/coverage/trt-parametric/xyzac-trt-model.png
new file mode 100644
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diff --git a/coverage/trt-parametric/xyzbc-trt-model.png b/coverage/trt-parametric/xyzbc-trt-model.png
new file mode 100644
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diff --git a/docs/trt-parametric/01-项目功能内容.md b/docs/trt-parametric/01-项目功能内容.md
new file mode 100644
index 0000000..5855d08
--- /dev/null
+++ b/docs/trt-parametric/01-项目功能内容.md
@@ -0,0 +1,34 @@
+# 项目功能内容
+
+## 目标与边界
+
+在同一控制界面支持 XYZAC/XYZBC 参数化机床。INI 是机床几何输入的唯一来源；LinuxCNC WASM 是解释器、运动学、轨迹和状态的唯一计算权威。React 负责参数草稿、命令和状态显示，Three.js 负责几何投影。
+
+配置文件位于 `linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/`。
+
+| 参数 | XYZAC | XYZBC | 单位 |
+| --- | --- | --- | --- |
+| x-rot-point / y-rot-point / z-rot-point | 支持 | 支持 | mm |
+| x-offset | 原生算法不支持 | 支持 | mm |
+| y-offset | 支持 | 原生算法不支持 | mm |
+| z-offset | 支持 | 支持 | mm |
+
+不支持的偏置在界面禁用；不得把无效参数呈现为可影响运动的参数。刀长仍由现有刀具链路管理，不混入这六项几何参数。
+
+## 用户流程
+
+1. 选择机床，读取对应 INI 的 `[HAL] HALCMD` 参数及源位置。
+2. 结构预览旁按“旋转中心”和“轴间偏置”分组，显示 mm、已生效值及待应用状态。
+3. 修改参数，验证有限数字、支持范围和文件一致性。
+4. 在机床关闭、程序空闲时应用，重新初始化配置和解析当前 G 代码；应用后重新回零。
+5. 保存/导出修改后的 INI；重新读取磁盘文件时使用最新参数。
+
+浏览器虚拟工作区与宿主磁盘须明确区分：应用到 Worker 不等于已写回仓库文件；支持文件句柄的浏览器可保存已选文件，其他环境导出 INI。
+
+## 验收行为
+
+- 修改有效参数后，Worker 快照参数、结构旋转中心及非零旋转姿态的 WASM 关节解一致变化。
+- G 代码文本和编程坐标不必变化；同一程序的机器关节轨迹应随有效参数变化。禁止人为平移 G 代码来伪造结果。
+- 参数错误、程序运行/暂停、机床开启时不允许应用；失败不得显示成功或展示过期参数为已生效。
+- 两种机床参数相互隔离；保留当前程序；重新加载产生新预览，清理旧运行轨迹。
+- 桌面和移动布局无重叠，3D 非空、可交互，保存和重新读取可复现参数。
diff --git a/docs/trt-parametric/02-项目程序开发详细步骤.md b/docs/trt-parametric/02-项目程序开发详细步骤.md
new file mode 100644
index 0000000..229505c
--- /dev/null
+++ b/docs/trt-parametric/02-项目程序开发详细步骤.md
@@ -0,0 +1,25 @@
+# 项目程序开发详细步骤
+
+## TRT-P01 配置源与上下文
+
+审计 `sim-case-loader.mjs` 的固定参数、`SimSession.LOAD_WORKSPACE`、`WasmXyzacKinematics`、原生 TRT 方程和 Three.js 模型。建立六份文档及索引，记录工作区原有改动。
+
+## TRT-P02 INI 参数入口
+
+复用 `parseIni` 和 `WorkspaceRuntime`，按顺序读取重复 HALCMD；识别旋转中心 setp 和偏置 net/sets。数值、重复赋值、缺项和不支持项必须可诊断，不默默回落到固定几何。编辑时仅替换定位到的参数数值，保留文件其他内容。配置读取器同时供加载器和 Worker 使用，Worker 从收到的文件再次读取，拒绝外部独立 offsets 覆盖。
+
+## TRT-P03 应用与 G 代码
+
+复用 `LOAD_WORKSPACE` 与 `PROGRAM_LOAD`，不新增 JS 运动算法。重新加载配置前验证输入及状态；重建 WASM 运动学、预览和运行环境。验证 RTCP 开启下非零 A/B/C 的同一段 G 代码产生不同关节轨迹，身份运动学模式不应伪装为 RTCP。
+
+## TRT-P04 结构预览
+
+从 Worker 快照读取六项参数。用旋转中心父节点及局部偏置表达模型层级，保持线性轴和刀具来源不变。验证零角度、单轴旋转和复合旋转，路径仍附着在转台坐标系。这里的矩阵只用于图形投影。
+
+## TRT-P05 参数界面
+
+在机床结构预览处放置紧凑参数区：旋转中心三项、偏置三项；无效偏置禁用。提供应用、重新读取、导入和保存 INI。维护草稿与已生效状态，异步期间禁止重复应用或切换，错误可见。保持当前 G 代码，应用后要求重新回零。
+
+## TRT-P06 验收与接续
+
+执行参数读取/写回负例、真实 WASM Worker 两机型测试、结构模型断言、React typecheck/build 和 Playwright 桌面/移动截图及 canvas 像素检查。证据统一写入 `coverage/trt-parametric/`，实际命令和产物登记到 05。记录未满足项，不用旧报告替代本轮测试。
diff --git a/docs/trt-parametric/03-推进台账.md b/docs/trt-parametric/03-推进台账.md
new file mode 100644
index 0000000..13a44ed
--- /dev/null
+++ b/docs/trt-parametric/03-推进台账.md
@@ -0,0 +1,23 @@
+# 推进台账
+
+## R02 / 2026-09-17 / 仓库保存
+
+- 用户授权：将本轮成果保存到 `https://gitea.meswork.com/wangdequan/linuxcncWebWASM.git`。
+- 保存范围：TRT 参数化代码、测试、六份项目文档及索引、`coverage/trt-parametric/` 验收报告与截图。
+- 检查：远程 `origin` 与指定仓库一致；提交前已获取远程 main，差异格式检查通过。功能验证沿用 E02/E03/E04，代码未再变更。
+- 原有两份大体积 tick trace、linuxcnc 子模块本地改动、临时脚本和用户图片继续留在本地，不并入本次专项提交。
+- 目标分支：`main`；推送完成以 Git 远程分支提交 ID 与本地 HEAD 一致为准。
+- 后续开发仍按 TRT-R01 接续。
+
+## R01 / 2026-09-17 / 已完成
+
+- 目标：建立上下文，完成 INI → WASM → G 代码/机床预览参数链路。
+- 已检查：加载器当前使用固定 offsets；WASM ABI 已有全部旋转中心和偏置字段；模型缺失旋转中心投影。
+- 已改文件：本目录六份文档、README；根 README 增加入口；新增 `web/workspace/trt-geometry.mjs`、`web/react/src/TrtGeometryPanel.tsx`、`web/react/src/test_trt_parametric.mjs`、`scripts/test_trt_parametric_browser.mjs`。
+- 接入改动：`sim-case-loader.mjs`、`sim-session.mjs`、`App.tsx`、`legacy.d.ts`、`styles.css`、`xyzac-machine-model.ts`、`XyzacMachineView.tsx`；更新相关加载、回零、两机型程序、模型和浏览器回归测试。
+- 完成行为：INI 参数读写和 Worker 二次校验；应用时重载当前程序、清理轨迹并失效回零；旧几何 checkpoint/trace 拒绝恢复；分组参数界面、文件导入和原生 INI 保存。
+- 结构修正：三个 rot-point 进入转台层级；XYZBC 的固定 90 度仅作用于铸件，旋转坐标系按 WASM 保持一致；补齐原生 yslide 的 150 mm 高度。
+- 验证：E02/E03/E04。两机型真实 WASM 程序、确定性重放、结构/刀尖一致性、船体程序、参数保存导入、桌面/移动布局和 3D 像素/交互通过。React 类型和构建通过。
+- 中间失败及处理：旧测试假定 HOME 同步完成，改为等待真实 homing tick；缺失图片测试改用显式 emc2.gif 输入，避免依赖用户修改过的 INI；机型选择测试改为等待 Worker 成功后断言。浏览器新测试改为等待重载完成并排除 hidden 文件 input 的布局断言。
+- 原有改动：两份 coverage tick trace、linuxcnc 子模块内多处 INI/C++/Tcl 改动、临时测试脚本和 PNG 均保留，不作为本轮产物。
+- 下一步：TRT-R01。既有 `test_xyzac_recovery.mjs` 虽退出 0，但报告 `endpoint_at_checkpoint_equal=false`；不能作为完整恢复等价证据。该问题单独登记，不扩展本轮到 TP 恢复重构。
diff --git a/docs/trt-parametric/04-任务矩阵.md b/docs/trt-parametric/04-任务矩阵.md
new file mode 100644
index 0000000..95b7a42
--- /dev/null
+++ b/docs/trt-parametric/04-任务矩阵.md
@@ -0,0 +1,13 @@
+# 任务矩阵
+
+状态只使用：待办、进行中、已验收、阻塞。已验收必须引用 05 中的证据编号。
+
+| 编号 | 内容 | 依赖 | 状态 | 验收标准 | 证据 |
+| --- | --- | --- | --- | --- | --- |
+| TRT-P01 | 来源审计与上下文文档 | 无 | 已验收 | 六份文档、索引、源语义和现存缺口可追溯 | E01 |
+| TRT-P02 | INI 唯一参数入口 | P01 | 已验收 | 两机型参数读写、无效输入拒绝、取消固定值覆盖 | E02 |
+| TRT-P03 | Worker 与 G 代码重新解析 | P02 | 已验收 | 文件参数进入 WASM；同程序旋转姿态关节解随参数改变；状态门控有效 | E02 |
+| TRT-P04 | 参数化结构投影 | P02 | 已验收 | 旋转中心及偏置驱动两模型；转台路径层级一致 | E02 |
+| TRT-P05 | 参数编辑及文件流程 | P03,P04 | 已验收 | 分组布局、应用/重新读取/导入/保存、保留程序、错误反馈 | E03 |
+| TRT-P06 | 回归及证据收口 | P03,P04,P05 | 已验收 | 专项、相关回归、构建、桌面/移动交互截图和像素检查通过；既有恢复偏差独立登记 | E02,E03,E04 |
+| TRT-R01 | 既有 checkpoint 恢复状态精度 | P06 | 待办 | 定位 HAL tick 与 TP queue/progress 恢复差异；将恢复测试的相等性变为有效断言，再验证固定 tick 连续与恢复轨迹 | E04：遗留项 |
diff --git a/docs/trt-parametric/05-验收证据.md b/docs/trt-parametric/05-验收证据.md
new file mode 100644
index 0000000..92beb18
--- /dev/null
+++ b/docs/trt-parametric/05-验收证据.md
@@ -0,0 +1,58 @@
+# 验收证据
+
+只登记实际执行结果。job_id/report_id 由真实运行产生；没有的字段记“不适用”，不编造 PDF 或截图。
+
+## E01 来源审计 / 2026-09-17
+
+- 命令：`git status --short --branch`、`git -C linuxcnc status --short`、`rg -n 'offset|rot_point' wasm-core/src/sim_kinematics.c`。
+- 基线：主仓库 HEAD `9232f290279459765333b2ac274aa762ec06d6c0`。
+- 发现：`web/workspace/sim-case-loader.mjs` 中 CASE_KINEMATICS 固定几何值；`web/react/src/xyzac-machine-model.ts` 未投影 rot-point。
+- 方程：`wasm-core/src/sim_kinematics.c` 的 XYZAC 使用 dy/dz，XYZBC 使用 dx/dz，二者均使用三个 rot-point。
+- 结果：审计完成；这不是功能验收。
+- job_id / report_id / PDF / 截图：不适用。
+
+## E02 参数链路与结构投影
+
+- 命令：`node web/react/src/test_trt_parametric.mjs`。
+- report_id：`trt-parametric-worker-v1`；产物：`coverage/trt-parametric/worker.report.json`。
+- 结果：XYZAC/XYZBC 的参数读写、无效数值/缺项/重复项拒绝、CRLF/注释保留、INI 引用、Worker 忽略外部 offsets 覆盖通过。
+- 同程序基线与新参数在 tick 11 出现首个关节差异；编程终点相同；新参数的固定 tick 重放逐项一致。
+- 每个配置检查零角度、单倾转、单 C 旋转、复合旋转共四种姿态，WASM 逆解驱动的模型编程点与刀尖误差小于 `1e-7` 场景单位。
+- 运行后的重载清空预览、重置回零状态；机床开启时重载被拒绝。
+- `ctest --test-dir build-native -R 'sim_kinematics' --output-on-failure`：已有 native 二进制 5/5 通过，不等同于新建官方 native trace 对照。
+- `node web/react/src/test_xyzac_threejs.mjs`：通过。
+- 参数修改后恢复旧 checkpoint、compact power-off checkpoint、trace 均拒绝，当前几何及未回零状态不变。
+- WASM 文件 SHA-256：`ab1b90a6a2474b954849ee75d1163e11ee37c4653dd074bba3483d52d9dec2a9`。本轮使用已有核心，不修改 C ABI。
+- worker.report.json SHA-256：`e5cba3c7fe4aa04408cc1f7a574d4044090bbdc4bf85fbcb8f0cd3cd48b27aa0`。
+
+## E03 浏览器端到端
+
+命令：
+
+```bash
+PLAYWRIGHT_MODULE=/home/mes006/.npm/_npx/e41f203b7505f1fb/node_modules/playwright/index.mjs node scripts/test_trt_parametric_browser.mjs
+```
+
+- 页面：`http://127.0.0.1:5174/`；report_id：`trt-parametric-browser-v1`。
+- 报告：[browser.report.json](../../coverage/trt-parametric/browser.report.json)。SHA-256：`957c93d24202823880630937e74b8c3f23e5786bc9d1d7a7219dff98f9d573aa`。
+- 两机型均验证应用、保持程序路径、导出原生 INI、重新读取、重新导入应用、开机禁用/关机解锁。
+- 导出的 INI 保留 `LIB:basic_sim.tcl`，不泄露 Web `_cmds.hal` 替换；导出分别为 4867 和 4875 字符。
+- 1440×1000 与 390×844 布局无页面横向溢出；参数控件均位于视口内；canvas 分别为 472×360 和 368×378，颜色数 1691/1804，旋转前后像素 hash 改变；pageerror 为零。
+- 最终截图：[桌面](../../coverage/trt-parametric/layout-1440.png)、[移动端](../../coverage/trt-parametric/layout-390.png)、[XYZAC](../../coverage/trt-parametric/xyzac-trt-model.png)、[XYZBC](../../coverage/trt-parametric/xyzbc-trt-model.png)。均已人工查看。
+- `failure.png` 保留中间测试失败截图；最终结论以 report 和 layout 截图为准。
+- job_id / PDF：不适用。浏览器保存对话框本身需要用户选择磁盘位置；自动测试验证下载回退及其文件内容。
+
+## E04 相关回归与边界
+
+| 命令 | 结果 |
+| --- | --- |
+| `npm --prefix web/react run build` | TypeScript 和生产构建通过；现有大 chunk 警告仍在 |
+| `node web/workspace/test_sim_case_loader.mjs` | 通过 |
+| `node web/worker/test_xyzac_trt_case.mjs` | 通过，TASK_READY、五关节、M428/M429/M430 和直接切换 |
+| `node web/worker/test_boat_trt_programs.mjs` | XYZAC/XYZBC 均完成程序 |
+| `node web/worker/test_xyzac_program_replace.mjs` | 通过，失败解析不保留旧预览 |
+| `PLAYWRIGHT_MODULE=... node scripts/test_xyzbc_panel_browser.mjs` | 通过，双 canvas、轴序、转台路径附着、无 HUD |
+| `git diff --check -- README.md web scripts docs/trt-parametric` | 通过 |
+| `node web/worker/test_xyzac_recovery.mjs` | 退出 0，但其内部输出恢复前后 HAL tick / TP progress / queue 状态不同，`endpoint_at_checkpoint_equal=false`；登记 TRT-R01，不能声称恢复完全等价 |
+
+本次未重跑全仓历史发布 gate、全部浏览器矩阵或官方 native 对照。专项测试验证浏览器仿真，不是实际机床控制验收。
diff --git a/docs/trt-parametric/06-决策记录.md b/docs/trt-parametric/06-决策记录.md
new file mode 100644
index 0000000..ff40bb0
--- /dev/null
+++ b/docs/trt-parametric/06-决策记录.md
@@ -0,0 +1,33 @@
+# 决策记录
+
+## D01 / 2026-09-17 / 几何参数唯一入口
+
+INI 文件内容是几何输入来源，Worker 再次解析文件后传入已有 WASM ABI。移除生产加载链路的固定 offsets，避免界面、预览和执行各自持有参数。
+
+## D02 / 2026-09-17 / 保持原生参数含义
+
+XYZAC 不支持 x-offset，XYZBC 不支持 y-offset。六项都可见，但不支持项禁用且不允许非零值。三个 rot-point 在 WASM 已有支持；原 Vismach 不支持不构成本次 Web 参数化的限制。新需求覆盖旧设计文档中不得开放 rot-point 编辑的历史约束。
+
+## D03 / 2026-09-17 / 配置更改采用重载
+
+先做关机、空闲状态下的完整重载，不在运行中热修改几何。重建配置、重新解析当前程序并重新回零，以免旧轨迹或回零结果与新结构混用。参数变化改变机器解，编程坐标的路径允许保持相同。
+
+## D04 / 2026-09-17 / 文件保存边界
+
+浏览器应用到 Worker 只修改虚拟配置，不冒充宿主文件已保存。采用显式文件导入和保存/导出；直接修改仓库 INI 后重新读取也应生效。静态部署无需增加写磁盘服务。
+
+## D05 / 2026-09-17 / 证据与范围
+
+本专项不改历史发布 gate 或 context lock，不宣称全 LinuxCNC 对等。每轮以任务矩阵和实测证据接续，未运行验证标为待办。保留工作区已有改动。
+
+## D06 / 2026-09-17 / 图形变换与原生方程一致
+
+转台层级采用旋转中心平移、轴间偏置平移、倾转、反向偏置、C 旋转及编程原点回移。XYZBC 的 90 度铸件朝向与 B 倾转坐标系分开；原生 `xyzbc-trt-gui.py` 的 yslide 基准是 150 mm。用 WASM 逆解输出驱动模型，在四种姿态验证模型上的编程点与刀尖重合，不在 JavaScript 中复制逆解方程。
+
+## D07 / 2026-09-17 / 恢复与文件能力边界
+
+参数改变后旧 checkpoint/trace 不得恢复到新几何，恢复前检查机型及六项几何值。完整恢复状态精度另由 TRT-R01 跟踪。INI 读取支持现有 include/引用解析；单文件编辑导出不支持把分散在 include 中的参数打包，界面对此明确报错，需修改实际包含文件后重新读取。
+
+## D08 / 2026-09-17 / 异步界面状态
+
+机型选择在 Worker 成功载入后提交；重新读取期间锁定主界面加载动作。参数应用成功但当前程序解析失败时，保留已生效参数并显示程序解析错误，旧路径已清理；不声称整笔操作回滚成功。
diff --git a/docs/trt-parametric/README.md b/docs/trt-parametric/README.md
new file mode 100644
index 0000000..a6430fc
--- /dev/null
+++ b/docs/trt-parametric/README.md
@@ -0,0 +1,18 @@
+# 五轴 TRT 参数化设计接续索引
+
+本目录对应 2026-09-17 用户要求：在机床结构预览中配置 `xyzac-trt.ini`、`xyzbc-trt.ini`，统一几何参数、LinuxCNC WASM 运动学和 G 代码执行结果。
+
+## 读取顺序
+
+1. 本索引 → [04-任务矩阵](04-任务矩阵.md)：选择首个依赖满足且未验收的任务。
+2. [03-推进台账](03-推进台账.md)：只读最新一轮和下一步。
+3. 按任务读取 [01-项目功能内容](01-项目功能内容.md)、[02-项目程序开发详细步骤](02-项目程序开发详细步骤.md) 和直接相关代码。
+4. 实施前核对 [06-决策记录](06-决策记录.md)，验收后更新 [05-验收证据](05-验收证据.md)、矩阵和台账。
+
+每轮必须记录实际改动、命令、结果和下一任务。未运行的检查不能记为通过；历史通过任务仅在相关代码改变时回归。此目录是本专项接续入口，历史仿真/发布轨道仍保留原有指针，不据此扩大发布范围。
+
+当前状态：`TRT-P01` 至 `TRT-P06` 已验收。下一项为矩阵中的 `TRT-R01`，属于既有恢复精度问题，不影响本专项参数应用流程。实现不依赖聊天记录。用户文字提及 Image #1，但本轮未收到可读取的图片资源，布局按现有结构预览实现。
+
+本地体验地址：`http://127.0.0.1:5174/`。启动命令：`npm --prefix web/react run dev -- --port 5174 --strictPort`；该端口被占用时选择其他端口。
+
+在机床结构预览下方修改参数，关机且空闲时应用。保存 INI 会打开浏览器保存对话框，或下载文件；应用本身不覆盖磁盘。直接修改仓库里的 INI 后，点击“重新读取 INI”即可重新解析当前程序。
diff --git a/scripts/test_trt_parametric_browser.mjs b/scripts/test_trt_parametric_browser.mjs
new file mode 100644
index 0000000..007df55
--- /dev/null
+++ b/scripts/test_trt_parametric_browser.mjs
@@ -0,0 +1,90 @@
+import assert from "node:assert/strict";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
+import { pathToFileURL } from "node:url";
+
+const { chromium } = await import(pathToFileURL(process.env.PLAYWRIGHT_MODULE).href);
+const output = new URL("../coverage/trt-parametric/", import.meta.url);
+await mkdir(output, { recursive: true });
+const browser = await chromium.launch({ executablePath: "/usr/bin/google-chrome", headless: true, args: ["--no-sandbox", "--use-angle=swiftshader", "--enable-unsafe-swiftshader"] });
+const page = await browser.newPage({ viewport: { width: 1440, height: 1000 } });
+await page.addInitScript(() => { window.showSaveFilePicker = undefined; });
+const errors = [];
+page.on("pageerror", (error) => errors.push(error.message));
+const control = (id) => page.locator(`[data-axis-control="${id}"]`);
+const machine = page.locator(".xyzac-machine-view");
+const panel = page.locator(".trt-geometry");
+const settled = async () => {
+  await page.waitForFunction(() => document.querySelector("main")?.dataset.axisProgramLoading === "false" && document.querySelector(".trt-geometry")?.getAttribute("aria-busy") === "false");
+  await page.waitForTimeout(350);
+};
+const pixels = () => machine.locator("canvas[data-engine]").evaluate((canvas) => {
+  const gl = canvas.getContext("webgl2"); const bytes = new Uint8Array(canvas.width * canvas.height * 4);
+  gl.readPixels(0, 0, canvas.width, canvas.height, gl.RGBA, gl.UNSIGNED_BYTE, bytes);
+  let hash = 2166136261; const colors = new Set();
+  for (let i = 0; i < bytes.length; i += 16) { hash = Math.imul(hash ^ bytes[i], 16777619); colors.add(`${bytes[i]},${bytes[i + 1]},${bytes[i + 2]}`); }
+  return { hash: hash >>> 0, colors: colors.size, width: canvas.width, height: canvas.height };
+});
+const report = { report_id: "trt-parametric-browser-v1", status: "running", machines: [], viewports: [] };
+try {
+  await page.goto(process.env.XYZAC_PANEL_URL ?? "http://127.0.0.1:5174/"); await settled();
+  for (const [id, unsupported] of [["xyzac-trt", "x-offset"], ["xyzbc-trt", "y-offset"]]) {
+    if (id === "xyzbc-trt") { await control("machine-type-select").selectOption({ label: "XYZBC TRT" }); await settled(); }
+    assert.equal(await machine.getAttribute("data-xyzac-model-id"), id);
+    assert.equal(await panel.getByLabel(unsupported, { exact: true }).isDisabled(), true);
+    const beforePath = await page.locator("main").getAttribute("data-axis-program-path");
+    const original = JSON.parse(await machine.getAttribute("data-xyzac-offsets"));
+    const before = await pixels(); assert.ok(before.colors > 100);
+    await panel.getByLabel("x-rot-point", { exact: true }).fill("24");
+    await panel.getByLabel("y-rot-point", { exact: true }).fill("-12");
+    await panel.getByLabel("z-rot-point", { exact: true }).fill("8");
+    await control("geometry-apply").click(); await settled();
+    const offsets = JSON.parse(await machine.getAttribute("data-xyzac-offsets"));
+    assert.equal(offsets.x_rot_point, 24); assert.equal(offsets.y_rot_point, -12); assert.equal(offsets.z_rot_point, 8);
+    assert.equal(await page.locator("main").getAttribute("data-axis-program-path"), beforePath);
+    assert.notEqual((await pixels()).hash, before.hash);
+    await machine.screenshot({ path: new URL(`${id}-model.png`, output).pathname });
+    const downloading = page.waitForEvent("download"); await control("geometry-save").click();
+    const download = await downloading;
+    assert.equal(download.suggestedFilename(), `${id}.ini`);
+    const exported = await readFile(await download.path(), "utf8");
+    assert.match(exported, /x-rot-point\s+24/); assert.match(exported, /LIB:basic_sim.tcl/);
+    assert.doesNotMatch(exported, /HALFILE = .*_cmds.hal/);
+    await control("geometry-reload").click(); await settled();
+    assert.deepEqual(JSON.parse(await machine.getAttribute("data-xyzac-offsets")), original);
+    await panel.locator('input[type="file"]').setInputFiles({ name: `${id}.ini`, mimeType: "text/plain", buffer: Buffer.from(exported) });
+    await page.waitForFunction(() => document.querySelector('.trt-geometry input[aria-label="x-rot-point"]')?.value === "24");
+    await control("geometry-apply").click(); await settled();
+    assert.equal(JSON.parse(await machine.getAttribute("data-xyzac-offsets")).x_rot_point, 24);
+    await control("toolbar-power").click();
+    await page.waitForFunction(() => document.querySelector('.trt-geometry input[aria-label="x-rot-point"]')?.disabled === true);
+    assert.equal(await panel.getByLabel("x-rot-point", { exact: true }).isDisabled(), true);
+    await control("toolbar-power").click();
+    await page.waitForFunction(() => document.querySelector('.trt-geometry input[aria-label="x-rot-point"]')?.disabled === false);
+    assert.equal(await panel.getByLabel("x-rot-point", { exact: true }).isDisabled(), false);
+    report.machines.push({ id, offsets, export_bytes: exported.length, preserved_program: beforePath, canvas: before });
+  }
+  for (const [width, height] of [[1440, 1000], [390, 844]]) {
+    await page.setViewportSize({ width, height }); await panel.scrollIntoViewIfNeeded(); await page.waitForTimeout(400);
+    const canvas = await pixels(); assert.ok(canvas.colors > 100 && canvas.width > 100 && canvas.height >= 220);
+    const boxes = await panel.locator("label, input:not([hidden]), button").evaluateAll((elements) => elements.map((element) => {
+      const r = element.getBoundingClientRect(); return { x: r.x, right: r.right, width: r.width };
+    }));
+    assert.ok(boxes.every((r) => r.width > 0 && r.x >= 0 && r.right <= width), JSON.stringify(boxes));
+    assert.ok(await page.evaluate(() => document.documentElement.scrollWidth <= window.innerWidth));
+    const before = await pixels();
+    await control("machine-rotateLeft").click(); await page.waitForTimeout(400);
+    assert.notEqual((await pixels()).hash, before.hash);
+    await page.screenshot({ path: new URL(`layout-${width}.png`, output).pathname, fullPage: true });
+    report.viewports.push({ width, height, canvas, controls_fit: true, interactive: true });
+  }
+  assert.deepEqual(errors, []); report.status = "verified";
+} catch (error) {
+  report.status = "failed"; report.error = String(error.stack ?? error);
+  await page.screenshot({ path: new URL("failure.png", output).pathname, fullPage: true });
+  throw error;
+} finally {
+  report.browser_errors = errors;
+  await writeFile(new URL("browser.report.json", output), JSON.stringify(report, null, 2) + "\n");
+  await browser.close();
+}
+console.log(JSON.stringify(report));
diff --git a/scripts/test_xyzbc_panel_browser.mjs b/scripts/test_xyzbc_panel_browser.mjs
index 9ffbce6..c723065 100644
--- a/scripts/test_xyzbc_panel_browser.mjs
+++ b/scripts/test_xyzbc_panel_browser.mjs
@@ -15,8 +15,8 @@ try {
   await control("toolbar-power").click();
   await page.waitForTimeout(300);
   await control("machine-type-select").selectOption({ label: "XYZBC TRT" });
-  assert.equal(await control("machine-type-select").inputValue(), "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzbc-trt.ini");
   await page.waitForFunction(() => document.querySelector("main")?.dataset.axisProgramPath?.includes("boat-xyzbc.ngc") && document.querySelector("main")?.dataset.axisProgramLoading === "false", null, { timeout: 45000 });
+  assert.equal(await control("machine-type-select").inputValue(), "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzbc-trt.ini");
   const result = await page.evaluate(() => ({
     machine: document.querySelector(".xyzac-manual-summary")?.getAttribute("aria-label"),
     axes: [...document.querySelectorAll(".manual-axis-block .axis-radio span")].map((node) => node.textContent),
diff --git a/web/react/src/App.tsx b/web/react/src/App.tsx
index db610aa..11725d4 100644
--- a/web/react/src/App.tsx
+++ b/web/react/src/App.tsx
@@ -3,6 +3,8 @@ import { INITIAL_STATE, reduceFrontendState } from "./store";
 import { ReactWorkerClient } from "./worker-client";
 import { XyzacToolPreviewFromSnapshot } from "./XyzacToolPreview";
 import { XyzacMachineViewFromSnapshot } from "./XyzacMachineView";
+import { TrtGeometryPanel } from "./TrtGeometryPanel";
+import { readTrtGeometry } from "../../workspace/trt-geometry.mjs";
 import { loadSimulationCase, toWorkerConfiguration } from "../../workspace/sim-case-loader.mjs";
 import { axisIcon } from "./sourceAssets";
 import { HoldButton } from "./HoldButton";
@@ -226,6 +228,7 @@ export function App() {
   const [programText, setProgramTextState] = useState("");
   const [programPath, setProgramPath] = useState(DEFAULT_MACHINE.program);
   const [programLoading, setProgramLoading] = useState(true);
+  const [geometryBundle, setGeometryBundle] = useState<any>(null);
   const [selectedAxis, setSelectedAxis] = useState("x");
   const [selectedHomeJoint, setSelectedHomeJoint] = useState(0);
   const [leftTab, setLeftTab] = useState<"manual" | "mdi" | "diagnostics">("manual");
@@ -317,6 +320,7 @@ export function App() {
       setProgramTextState(normalizedSource); setProgramPath(DEFAULT_MACHINE.program);
       const configuration = toWorkerConfiguration(bundle);
       await operationController.execute("LOAD_WORKSPACE", { root_path: "/workspace", configuration }, { state: {}, gate: false });
+      setGeometryBundle(bundle);
       await operationController.execute("PROGRAM_LOAD", { source: normalizedSource, path: DEFAULT_MACHINE.program }, { state: {}, gate: false });
       uiCacheHydrated.current = true;
       setOperationTrace(operationController.exportTrace());
@@ -487,7 +491,10 @@ export function App() {
       const normalizedSource = normalizeProgramSource(source);
       setCaseStatus("starting exact case...");
       if (!latestLoadGate.current.enabled) throw new Error(latestLoadGate.current.reason);
+      if (machineOn) await operationController.execute("POWER", { active: false }, { gate: false });
       const operation = await operationController.execute("LOAD_WORKSPACE", { root_path: "/workspace", configuration: toWorkerConfiguration(bundle) }, { state: axisState, gate: false });
+      setGeometryBundle(bundle);
+      setCasePath(requestedCasePath);
       const resultPayload = (operation.response as { payload?: { configuration?: { state?: string } } }).payload;
       markPreviewProgress(28, "wasm", "LinuxCNC WASM 配置已加载，准备解析刀具路径");
       setProgramText(normalizedSource); setProgramPath(programPathForCase);
@@ -504,6 +511,32 @@ export function App() {
     } finally { setProgramLoading(false); }
   };
   const setProgramText = (value: string) => { setProgramTextState(value); };
+  const applyGeometry = async (source: any) => {
+    if (programLoading || machineOn || programRunning || programPaused) throw new Error("关机且程序空闲后可修改");
+    setProgramLoading(true);
+    startPreviewProgress("机床参数");
+    try {
+      const bundle = typeof source === "function" ? await source() : source;
+      readTrtGeometry(bundle);
+      const configuration = toWorkerConfiguration(bundle);
+      await operationController.execute("LOAD_WORKSPACE", { root_path: "/workspace", configuration }, { gate: false });
+      setGeometryBundle(bundle);
+      const loaded = await operationController.execute("PROGRAM_LOAD", { source: programText, path: programPath }, { gate: false });
+      finishPreviewProgress(programPath, loaded.response);
+      setCommandStatus("机床参数已应用，程序已重新解析，待重新回零");
+    } catch (error) {
+      failPreviewProgress(error instanceof Error ? error.message : String(error));
+      throw error;
+    } finally {
+      setOperationTrace(operationController.exportTrace());
+      setProgramLoading(false);
+    }
+  };
+  const reloadGeometry = () => applyGeometry(async () => {
+    const bundle = await loadSimulationCase({ path: casePath, baseUrl: "." });
+    if (bundle.status !== "ready") throw new Error(`INI blocked: ${bundle.missing.join(",")}`);
+    return bundle;
+  });
   const loadPackagedProgram = async () => {
     if (!canLoad) return;
     const path = selectedMachine.program;
@@ -758,11 +791,11 @@ export function App() {
     <header className="axis-window-header" data-axis-feature="AXIS-SHELL-01"><div className="axis-brand"><img src={axisIcon("axis-24x24.png")} alt="AXIS" /> <strong>AXIS</strong><span>LinuxCNC Web/WASM</span></div><span className={`connection-state ${state.status}`} data-axis-feature="AXIS-SHELL-01" role="status">Connection: {state.status.toUpperCase()}</span></header>
     <nav className="axis-menubar" data-axis-feature="AXIS-UI-02" aria-label="AXIS menu"><Menu label="File"><MenuAction controlId="menu-file-edit-tool-data" disabled disabledReason="host_boundary_tool_editor">Edit tool data...</MenuAction><MenuAction controlId="menu-file-quit" disabled disabledReason="host_boundary_process_quit">Quit</MenuAction></Menu><Menu label="Help"><MenuAction controlId="menu-help-about" onClick={() => setAboutOpen(true)}>About AXIS</MenuAction></Menu></nav>
     <section className="axis-toolbar" data-axis-feature="AXIS-UI-05" aria-label="AXIS toolbar"><IconButton controlId="toolbar-estop" feature="AXIS-MACHINE-01" label={isEstop ? "Cancel Emergency Stop [F1]" : "Emergency Stop [F1]"} asset="tool_estop.gif" danger onClick={toggleEstop} pressed={relief.estop ?? isEstop} /><IconButton controlId="toolbar-power" feature="AXIS-MACHINE-02" label={machineOn ? "Power off [F2]" : "Power on [F2]"} asset="tool_power.gif" disabled={!gates.power.enabled || programLoading} disabledReason={programLoading ? "axis_program_load_in_progress" : gates.power.reason} onClick={powerOn} pressed={relief.power} /><Separator /><IconButton controlId="toolbar-open" feature="AXIS-FILE-01" label="Open G-Code file [O]" asset="tool_open.gif" disabled={!canLoad} disabledReason={controlReason("load")} onClick={openProgramFile} /><IconButton controlId="toolbar-load-case" feature="AXIS-FILE-02" label={`Load exact ${selectedMachine.label} case`} asset="tool_verify.gif" disabled={!gates.load.enabled || programLoading} disabledReason={programLoading ? "axis_program_load_in_progress" : gates.load.reason} onClick={loadCase} /><IconButton controlId="toolbar-reload" feature="AXIS-FILE-04" label="Reload current G-code [Ctrl-R]" asset="tool_reload.gif" disabled={!gates.reload.enabled || programLoading} disabledReason={controlReason("reload")} onClick={loadProgram} /><Separator /><IconButton controlId="toolbar-run" feature="AXIS-MACHINE-03" label="Begin executing current file [R]" asset="tool_run.gif" disabled={!gates.run.enabled || programLoading} disabledReason={programLoading ? "axis_program_load_in_progress" : gates.run.reason} onClick={runProgram} pressed={relief.run} /><IconButton controlId="toolbar-step" feature="AXIS-MACHINE-05" label="Execute next line [T]" asset="tool_step.gif" disabled={!gates.step.enabled || programLoading} disabledReason={programLoading ? "axis_program_load_in_progress" : gates.step.reason} onClick={() => execute("PROGRAM_STEP")} /><IconButton controlId="toolbar-pause-resume" feature="AXIS-MACHINE-06" label={programPaused ? "Resume execution [S]" : "Pause execution [P]"} asset={programPaused ? "resume_inhibit.gif" : "tool_pause.gif"} disabled={programLoading || (programPaused ? !gates.resume.enabled : !gates.pause.enabled)} disabledReason={programLoading ? "axis_program_load_in_progress" : programPaused ? gates.resume.reason : gates.pause.reason} onClick={() => execute(programPaused ? "PROGRAM_RESUME" : "PROGRAM_PAUSE")} pressed={relief.pauseResume} /><IconButton controlId="toolbar-stop" feature="AXIS-MACHINE-07" label="Stop program execution [ESC]" asset="tool_stop.gif" disabled={!gates.abort.enabled} disabledReason={gates.abort.reason} onClick={() => stopProgram()} pressed={relief.abort} /><Separator /><IconButton controlId="toolbar-block-delete" feature="AXIS-MACHINE-09" label="Toggle skip lines with slash" asset="tool_blockdelete.gif" disabled disabledReason="blocked_by_abi: LinuxCNC block-delete state is unavailable" /><IconButton controlId="toolbar-optional-pause" feature="AXIS-MACHINE-08" label="Toggle optional pause" asset="tool_optpause.gif" disabled disabledReason="blocked_by_abi: LinuxCNC optional-stop state is unavailable" /><Separator /><IconButton controlId="toolbar-zoom-in" feature="AXIS-VIEW-01" label="Zoom in" asset="tool_zoomin.gif" onClick={() => setZoom((value) => Math.min(2, value + .2))} /><IconButton controlId="toolbar-zoom-out" feature="AXIS-VIEW-01" label="Zoom out" asset="tool_zoomout.gif" onClick={() => setZoom((value) => Math.max(.5, value - .2))} /><IconButton controlId="toolbar-view-z" feature="AXIS-VIEW-01" label="Top view" asset="tool_axis_z.gif" pressed={view === "z"} onClick={() => { setView("z"); setRightTab("preview"); }} /><IconButton controlId="toolbar-view-z2" feature="AXIS-VIEW-01" label="Rotated top view" asset="tool_axis_z2.gif" pressed={view === "z2"} onClick={() => { setView("z2"); setRightTab("preview"); }} /><IconButton controlId="toolbar-view-x" feature="AXIS-VIEW-01" label="Side view" asset="tool_axis_x.gif" pressed={view === "x"} onClick={() => { setView("x"); setRightTab("preview"); }} /><IconButton controlId="toolbar-view-y" feature="AXIS-VIEW-01" label="Front view" asset="tool_axis_y.gif" pressed={view === "y"} onClick={() => { setView("y"); setRightTab("preview"); }} /><IconButton controlId="toolbar-view-y2" feature="AXIS-VIEW-01" label="Inverted front view" asset="tool_axis_y2.png" pressed={view === "y2"} onClick={() => { setView("y2"); setRightTab("preview"); }} /><IconButton controlId="toolbar-view-p" feature="AXIS-VIEW-01" label="Perspective view" asset="tool_axis_p.gif" pressed={view === "p"} onClick={() => { setView("p"); setRightTab("preview"); }} /><IconButton controlId="toolbar-rotate" feature="AXIS-VIEW-02" label="Drag / rotate mode" asset="tool_rotate.gif" pressed={rotateMode} onClick={() => setRotateMode((value) => !value)} /><Separator /><IconButton controlId="toolbar-clear-live-plot" feature="AXIS-VIEW-15" label="Clear live plot [Ctrl-K]" asset="tool_clear.gif" onClick={() => xyzacCommand("VISUAL_CLEAR", {}, "vismachClear")} /></section>
-    <section className="axis-case-strip" data-axis-feature="AXIS-EDIT-03"><label>Simulation case<select data-axis-control="workspace-case-select" data-axis-feature="AXIS-EDIT-03" value={casePath} onChange={(event) => { const path = event.target.value; setCasePath(path); void loadCase(path); }}>{MACHINE_DEFINITIONS.map((machine) => <option key={machine.entrypoint} value={machine.entrypoint}>{machine.label}</option>)}</select></label><TextButton controlId="workspace-load-boat" feature="AXIS-EDIT-03" onClick={loadPackagedProgram} disabled={!canLoad} disabledReason={controlReason("load")}>Load {selectedMachine.coordinates} boat program</TextButton><span className={`case-status${programLoading ? " loading" : ""}`} title={caseStatus.startsWith("blocked:") ? caseStatus : loadedProgramPath} role="status" aria-live="polite" aria-busy={programLoading}>{programLoading ? "Loading program..." : caseStatus.startsWith("blocked:") ? caseStatus : `Program: ${loadedProgramName}`}</span>{previewProgress && <div className={`preview-load-indicator ${previewProgress.phase}`} role="status" aria-live="polite" aria-label="Toolpath preview loading progress"><span title={previewProgress.detail}>{previewProgress.detail}</span><progress max="100" value={previewProgress.percent}>{previewProgress.percent}%</progress><output>{previewProgress.percent}%</output></div>}</section>
+    <section className="axis-case-strip" data-axis-feature="AXIS-EDIT-03"><label>Simulation case<select data-axis-control="workspace-case-select" data-axis-feature="AXIS-EDIT-03" value={casePath} onChange={(event) => { const path = event.target.value; void loadCase(path); }}>{MACHINE_DEFINITIONS.map((machine) => <option key={machine.entrypoint} value={machine.entrypoint}>{machine.label}</option>)}</select></label><TextButton controlId="workspace-load-boat" feature="AXIS-EDIT-03" onClick={loadPackagedProgram} disabled={!canLoad} disabledReason={controlReason("load")}>Load {selectedMachine.coordinates} boat program</TextButton><span className={`case-status${programLoading ? " loading" : ""}`} title={caseStatus.startsWith("blocked:") ? caseStatus : loadedProgramPath} role="status" aria-live="polite" aria-busy={programLoading}>{programLoading ? "Loading program..." : caseStatus.startsWith("blocked:") ? caseStatus : `Program: ${loadedProgramName}`}</span>{previewProgress && <div className={`preview-load-indicator ${previewProgress.phase}`} role="status" aria-live="polite" aria-label="Toolpath preview loading progress"><span title={previewProgress.detail}>{previewProgress.detail}</span><progress max="100" value={previewProgress.percent}>{previewProgress.percent}%</progress><output>{previewProgress.percent}%</output></div>}</section>
     <MachineStatus status={state.snapshot?.source_status} commandStatus={commandStatus} />
-    <XyzacTrtPanel view={xyzacView} command={xyzacCommand} loading={programLoading} machineOptions={MACHINE_DEFINITIONS} selectedMachine={casePath} onMachineChange={(path) => { setCasePath(path); void loadCase(path); }} />
+    <XyzacTrtPanel view={xyzacView} command={xyzacCommand} loading={programLoading} machineOptions={MACHINE_DEFINITIONS} selectedMachine={casePath} onMachineChange={(path) => { void loadCase(path); }} />
     <XyzacLiveParameters snapshot={state.snapshot} />
-    <section className="axis-top-pane" data-axis-feature="AXIS-UI-06"><div className="axis-notebook left-notebook" data-axis-feature="AXIS-UI-06"><div className="notebook-tabs" role="tablist" aria-label="Manual, MDI and diagnostics controls"><button id="axis-tab-manual" data-axis-control="tab-manual" type="button" role="tab" aria-controls="axis-panel-manual" aria-selected={leftTab === "manual"} className={leftTab === "manual" ? "active" : ""} onClick={enterManualMode}>Manual Control [F3]</button><button id="axis-tab-mdi" data-axis-control="tab-mdi" type="button" role="tab" aria-controls="axis-panel-mdi" aria-selected={leftTab === "mdi"} className={leftTab === "mdi" ? "active" : ""} onClick={enterMdiMode}>MDI [F5]</button><button id="axis-tab-diagnostics" data-axis-control="tab-diagnostics" type="button" role="tab" aria-controls="axis-panel-diagnostics" aria-selected={leftTab === "diagnostics"} className={leftTab === "diagnostics" ? "active" : ""} onClick={() => setLeftTab("diagnostics")}>Diagnostics</button></div><div id="axis-panel-manual" role="tabpanel" aria-labelledby="axis-tab-manual" hidden={leftTab !== "manual"}><MachineSequence wasmReady={wasmSnapshotReady} allHomed={allHomed} canHome={gates.home.enabled && !programLoading} homeReason={controlReason("home")} onHomeAll={homeAll}><label>Joint <select data-axis-control="manual-home-joint-select" aria-label="Homing joint" value={selectedHomeJoint} disabled={programLoading || !gates.home.enabled} title={controlReason("home")} onChange={(event) => setSelectedHomeJoint(Number(event.target.value))}>{[0, 1, 2, 3, 4].map((j) => <option key={j} value={j}>{j}</option>)}</select></label><TextButton controlId="manual-home-axis" disabled={programLoading || !gates.home.enabled} disabledReason={controlReason("home")} onClick={homeAxis}>Home Joint</TextButton></MachineSequence><ManualControl axes={selectedMachine.axes} action={dispatch} canJog={!programLoading && gates.jog.enabled} canHome={!programLoading && gates.home.enabled} canSpindle={!programLoading && gates.spindle.enabled} canCoolant={!programLoading && gates.coolant.enabled} canTouchOff={!programLoading && gates.touchOff.enabled} canToolTouchOff={!programLoading && gates.toolTouchOff.enabled} selectedAxis={selectedAxis} setSelectedAxis={setSelectedAxis} spindleDirection={spindleDirection} spindleBrake={spindleBrake} coolant={coolant} onSpindle={onSpindle} onCoolant={onCoolant} onHomeAxis={homeAxis} onTouchOff={() => promptTouchOff(false)} onToolTouchOff={() => promptTouchOff(true)} active={leftTab === "manual"} metric={metric} reasons={Object.fromEntries(Object.keys(gates).map((name) => [name, controlReason(name as keyof typeof gates)]))} devices={state.devices ?? {}} /></div><div id="axis-panel-mdi" role="tabpanel" aria-labelledby="axis-tab-mdi" hidden={leftTab !== "mdi"}><MdiControl action={execute} canSubmit={Boolean(state.gates.mdi?.enabled)} ready={!programLoading && gates.mdi.enabled} reason={controlReason("mdi")} /></div><div id="axis-panel-diagnostics" role="tabpanel" aria-labelledby="axis-tab-diagnostics" hidden={leftTab !== "diagnostics"}><DiagnosticsPanel state={state} gates={gates} /><XyzacDiagnostics view={xyzacView} operations={operationTrace} alarms={state.alarms} error={state.error} /></div></div><div className="axis-notebook right-notebook" data-axis-feature="AXIS-UI-06"><div className="notebook-tabs" role="tablist" aria-label="Preview and DRO"><button id="axis-tab-preview" data-axis-control="tab-preview" type="button" role="tab" aria-controls="axis-panel-preview" aria-selected={rightTab === "preview"} className={rightTab === "preview" ? "active" : ""} onClick={() => setRightTab("preview")}>Preview</button><button id="axis-tab-dro" data-axis-control="tab-dro" type="button" role="tab" aria-controls="axis-panel-dro" aria-selected={rightTab === "dro"} className={rightTab === "dro" ? "active" : ""} onClick={() => setRightTab("dro")}>DRO</button></div><div id="axis-panel-preview" role="tabpanel" aria-labelledby="axis-tab-preview" className="axis-preview" hidden={rightTab !== "preview"}><div className="axis-preview-split" data-xyzac-preview-layout="split"><section className="axis-preview-pane axis-preview-toolpath" aria-label="Toolpath and live tool simulation"><XyzacToolPreviewFromSnapshot snapshot={state.snapshot} view={view} zoom={zoom} rotateMode={rotateMode} showPath={layers.path} showLive={layers.live} showLimits={layers.limits} showVelocity={layers.velocity} showOffsets={layers.offsets} showExtents={layers.extents} /></section><section className="axis-preview-pane axis-preview-machine" aria-label={`${selectedMachine.coordinates} machine model motion`}><XyzacMachineViewFromSnapshot snapshot={state.snapshot} view={view} zoom={zoom} rotateMode={rotateMode} showPath={layers.path} showLive={layers.live} showLimits={layers.limits} showVelocity={layers.velocity} showOffsets={layers.offsets} showExtents={layers.extents} /></section></div></div><div id="axis-panel-dro" role="tabpanel" aria-labelledby="axis-tab-dro" hidden={rightTab !== "dro"}><DroView axes={axes} state={state} coordType={coordType} displayType={displayType} metric={metric} setCoordType={setCoordType} setDisplayType={setDisplayType} setMetric={setMetric} /></div></div></section>
+    <section className="axis-top-pane" data-axis-feature="AXIS-UI-06"><div className="axis-notebook left-notebook" data-axis-feature="AXIS-UI-06"><div className="notebook-tabs" role="tablist" aria-label="Manual, MDI and diagnostics controls"><button id="axis-tab-manual" data-axis-control="tab-manual" type="button" role="tab" aria-controls="axis-panel-manual" aria-selected={leftTab === "manual"} className={leftTab === "manual" ? "active" : ""} onClick={enterManualMode}>Manual Control [F3]</button><button id="axis-tab-mdi" data-axis-control="tab-mdi" type="button" role="tab" aria-controls="axis-panel-mdi" aria-selected={leftTab === "mdi"} className={leftTab === "mdi" ? "active" : ""} onClick={enterMdiMode}>MDI [F5]</button><button id="axis-tab-diagnostics" data-axis-control="tab-diagnostics" type="button" role="tab" aria-controls="axis-panel-diagnostics" aria-selected={leftTab === "diagnostics"} className={leftTab === "diagnostics" ? "active" : ""} onClick={() => setLeftTab("diagnostics")}>Diagnostics</button></div><div id="axis-panel-manual" role="tabpanel" aria-labelledby="axis-tab-manual" hidden={leftTab !== "manual"}><MachineSequence wasmReady={wasmSnapshotReady} allHomed={allHomed} canHome={gates.home.enabled && !programLoading} homeReason={controlReason("home")} onHomeAll={homeAll}><label>Joint <select data-axis-control="manual-home-joint-select" aria-label="Homing joint" value={selectedHomeJoint} disabled={programLoading || !gates.home.enabled} title={controlReason("home")} onChange={(event) => setSelectedHomeJoint(Number(event.target.value))}>{[0, 1, 2, 3, 4].map((j) => <option key={j} value={j}>{j}</option>)}</select></label><TextButton controlId="manual-home-axis" disabled={programLoading || !gates.home.enabled} disabledReason={controlReason("home")} onClick={homeAxis}>Home Joint</TextButton></MachineSequence><ManualControl axes={selectedMachine.axes} action={dispatch} canJog={!programLoading && gates.jog.enabled} canHome={!programLoading && gates.home.enabled} canSpindle={!programLoading && gates.spindle.enabled} canCoolant={!programLoading && gates.coolant.enabled} canTouchOff={!programLoading && gates.touchOff.enabled} canToolTouchOff={!programLoading && gates.toolTouchOff.enabled} selectedAxis={selectedAxis} setSelectedAxis={setSelectedAxis} spindleDirection={spindleDirection} spindleBrake={spindleBrake} coolant={coolant} onSpindle={onSpindle} onCoolant={onCoolant} onHomeAxis={homeAxis} onTouchOff={() => promptTouchOff(false)} onToolTouchOff={() => promptTouchOff(true)} active={leftTab === "manual"} metric={metric} reasons={Object.fromEntries(Object.keys(gates).map((name) => [name, controlReason(name as keyof typeof gates)]))} devices={state.devices ?? {}} /></div><div id="axis-panel-mdi" role="tabpanel" aria-labelledby="axis-tab-mdi" hidden={leftTab !== "mdi"}><MdiControl action={execute} canSubmit={Boolean(state.gates.mdi?.enabled)} ready={!programLoading && gates.mdi.enabled} reason={controlReason("mdi")} /></div><div id="axis-panel-diagnostics" role="tabpanel" aria-labelledby="axis-tab-diagnostics" hidden={leftTab !== "diagnostics"}><DiagnosticsPanel state={state} gates={gates} /><XyzacDiagnostics view={xyzacView} operations={operationTrace} alarms={state.alarms} error={state.error} /></div></div><div className="axis-notebook right-notebook" data-axis-feature="AXIS-UI-06"><div className="notebook-tabs" role="tablist" aria-label="Preview and DRO"><button id="axis-tab-preview" data-axis-control="tab-preview" type="button" role="tab" aria-controls="axis-panel-preview" aria-selected={rightTab === "preview"} className={rightTab === "preview" ? "active" : ""} onClick={() => setRightTab("preview")}>Preview</button><button id="axis-tab-dro" data-axis-control="tab-dro" type="button" role="tab" aria-controls="axis-panel-dro" aria-selected={rightTab === "dro"} className={rightTab === "dro" ? "active" : ""} onClick={() => setRightTab("dro")}>DRO</button></div><div id="axis-panel-preview" role="tabpanel" aria-labelledby="axis-tab-preview" className="axis-preview" hidden={rightTab !== "preview"}><div className="axis-preview-split" data-xyzac-preview-layout="split"><section className="axis-preview-pane axis-preview-toolpath" aria-label="Toolpath and live tool simulation"><XyzacToolPreviewFromSnapshot snapshot={state.snapshot} view={view} zoom={zoom} rotateMode={rotateMode} showPath={layers.path} showLive={layers.live} showLimits={layers.limits} showVelocity={layers.velocity} showOffsets={layers.offsets} showExtents={layers.extents} /></section><section className="axis-preview-pane axis-preview-machine" aria-label={`${selectedMachine.coordinates} machine model motion`}><XyzacMachineViewFromSnapshot snapshot={state.snapshot} view={view} zoom={zoom} rotateMode={rotateMode} showPath={layers.path} showLive={layers.live} showLimits={layers.limits} showVelocity={layers.velocity} showOffsets={layers.offsets} showExtents={layers.extents} /><TrtGeometryPanel bundle={geometryBundle} disabled={machineOn || programRunning || programPaused || !wasmSnapshotReady} busy={programLoading} onApply={applyGeometry} onReload={reloadGeometry} /></section></div></div><div id="axis-panel-dro" role="tabpanel" aria-labelledby="axis-tab-dro" hidden={rightTab !== "dro"}><DroView axes={axes} state={state} coordType={coordType} displayType={displayType} metric={metric} setCoordType={setCoordType} setDisplayType={setDisplayType} setMetric={setMetric} /></div></div></section>
     <section className="axis-metrics" data-axis-feature="AXIS-VIEW-03"><div className="axis-slider"><label>Jog Speed:<output>{jogScalePercent === null ? "-" : `${jogScalePercent}%`}</output><input type="range" data-axis-control="override-jog-speed" min="6" max="100" value={jogScalePercent ?? 6} onChange={(event) => void dispatch("SET_JOG_SCALE", { percent: Number(event.target.value) })} disabled={programLoading || jogScalePercent === null} aria-label="Jog speed" /></label><label>Feed Override:<output>{feedOverridePercent === null ? "-" : `${feedOverridePercent}%`}</output><input type="range" data-axis-control="override-feed" min="0" max="200" step="1" value={feedOverridePercent ?? 0} onChange={requestFeedOverride} disabled={programLoading || feedOverridePercent === null} aria-label="Feed override" aria-valuetext={feedOverridePercent === null ? "WASM state pending" : `${feedOverridePercent}%`} data-axis-feed-override={feedOverridePercent ?? ""} /></label><label>Spindle Override:<output>{spindleOverridePercent === null ? "-" : `${spindleOverridePercent}%`}</output><input type="range" data-axis-control="override-spindle" min="0" max="200" value={spindleOverridePercent ?? 0} onChange={(event) => void dispatch("SET_SPINDLE_OVERRIDE", { spindle: 0, scale: Number(event.target.value) / 100 })} disabled={programLoading || spindleOverridePercent === null} aria-label="Spindle override" /></label><label>Max Velocity:<output>{maxVelocityPercent === null ? "-" : `${maxVelocityPercent}%`}</output><input type="range" data-axis-control="override-max-velocity" min="6" max="100" value={maxVelocityPercent ?? 6} onChange={(event) => void dispatch("SET_MAX_VELOCITY", { percent: Number(event.target.value) })} disabled={programLoading || maxVelocityPercent === null} aria-label="Max velocity" /></label><label title="blocked_by_abi: LinuxCNC rapidrate is not exposed by the selected WASM TP"><span>Rapid Override</span><output>Unavailable</output><input type="range" data-axis-control="override-rapid" min="0" max="120" value="0" disabled aria-label="Rapid override" /></label></div><div className="axis-layer-controls" aria-label="Preview layers">{(["path", "live", "limits", "velocity", "offsets", "extents"] as const).map((layer) => <label key={layer}><input type="checkbox" data-axis-control={`preview-layer-${layer}`} data-axis-feature="AXIS-VIEW-03" checked={layers[layer]} onChange={(event) => setLayers((current) => ({ ...current, [layer]: event.target.checked }))} /> {layer}</label>)}</div></section>
     <XyzacProgramPane status={visibleProgramStatus} currentLine={visibleCurrentLine} sourceHash={programLoading ? "" : String(state.program?.source_hash ?? "")}><ProgramPane text={programText} setText={setProgramText} activeGcodes={activeGcodes} executionTrace={visibleExecutionTrace} programStatus={visibleProgramStatus} currentLine={visibleCurrentLine} executionLine={visibleExecutionLine} executionLineText={visibleExecutionLineText} diagnostic={state.error?.code ?? null} /></XyzacProgramPane>
     <input ref={programFileInput} className="visually-hidden-file-input" data-axis-control="program-file-input" type="file" accept=".ngc,.nc,.gcode,.tap,text/plain" onChange={onProgramFile} aria-label="Open G-code file" />
diff --git a/web/react/src/TrtGeometryPanel.tsx b/web/react/src/TrtGeometryPanel.tsx
new file mode 100644
index 0000000..ed6ddb8
--- /dev/null
+++ b/web/react/src/TrtGeometryPanel.tsx
@@ -0,0 +1,69 @@
+import { useEffect, useMemo, useRef, useState } from "react";
+import { readTrtGeometry, writeTrtGeometry, TRT_GEOMETRY_KEYS } from "../../workspace/trt-geometry.mjs";
+import { axisIcon } from "./sourceAssets";
+
+type Bundle = { entrypoint: string; files: Record<string, string>; source_ini?: string };
+type Props = { bundle: Bundle | null; disabled: boolean; busy: boolean; onApply: (bundle: Bundle) => Promise<void>; onReload: () => Promise<void> };
+
+export function TrtGeometryPanel({ bundle, disabled, busy, onApply, onReload }: Props) {
+  const [values, setValues] = useState<Record<string, string>>({});
+  const [message, setMessage] = useState("");
+  const [pending, setPending] = useState(false);
+  const file = useRef<HTMLInputElement>(null);
+  const geometry = useMemo(() => bundle ? readTrtGeometry(bundle) : null, [bundle]);
+  useEffect(() => {
+    setValues(Object.fromEntries(TRT_GEOMETRY_KEYS.map((key: string) => [key, String(geometry?.offsets[key] ?? 0)])));
+    setMessage("");
+  }, [bundle]);
+  const locked = disabled || busy || pending || !bundle;
+  const dirty = TRT_GEOMETRY_KEYS.some((key: string) => values[key] !== String(geometry?.offsets[key] ?? 0));
+  const run = async (action: () => Promise<void>, success: string) => {
+    setPending(true); setMessage("");
+    try { await action(); setMessage(success); }
+    catch (error) { setMessage(error instanceof Error ? error.message : String(error)); }
+    finally { setPending(false); }
+  };
+  const edited = () => {
+    if (!bundle) throw new Error("INI unavailable");
+    if (Object.values(geometry?.sources ?? {}).some((source) => source.path !== bundle.entrypoint)) throw new Error("参数位于包含文件，请修改源文件后重新读取 INI");
+    const next = writeTrtGeometry(bundle, values);
+    // Export the native INI, retaining LIB:basic_sim.tcl instead of the Web fixture.
+    next.source_ini = writeTrtGeometry({ ...bundle, files: { ...bundle.files, [bundle.entrypoint]: bundle.source_ini ?? bundle.files[bundle.entrypoint] } }, values).files[bundle.entrypoint];
+    return next;
+  };
+  const exportIni = async () => {
+    const next = edited();
+    const content = next.source_ini ?? next.files[next.entrypoint];
+    const name = next.entrypoint.split("/").at(-1)!;
+    const picker = (window as unknown as { showSaveFilePicker?: (options: unknown) => Promise<{ createWritable: () => Promise<{ write: (data: string) => Promise<void>; close: () => Promise<void> }> }> }).showSaveFilePicker;
+    if (picker) {
+      const handle = await picker({ suggestedName: name, types: [{ description: "LinuxCNC INI", accept: { "text/plain": [".ini"] } }] });
+      const stream = await handle.createWritable(); await stream.write(content); await stream.close();
+    } else {
+      const url = URL.createObjectURL(new Blob([content], { type: "text/plain" }));
+      const link = document.createElement("a"); link.href = url; link.download = name; link.click();
+      setTimeout(() => URL.revokeObjectURL(url), 1000);
+    }
+  };
+  const tool = (id: string, label: string, asset: string, action: () => void, off = locked) => <button type="button" data-axis-control={`geometry-${id}`} aria-label={label} title={label} disabled={off} onClick={action}><img src={axisIcon(asset)} alt="" /></button>;
+  return <section className="trt-geometry" aria-label="机床几何参数" aria-busy={pending || busy} data-dirty={dirty}>
+    <header><strong>{bundle?.entrypoint.split("/").at(-1) ?? "INI"}</strong><span>mm</span><output>{dirty ? "待应用" : "已生效"}</output></header>
+    <div className="trt-geometry-fields">{["旋转中心", "轴间偏置"].map((title, index) => <fieldset key={title}><legend>{title}</legend>{TRT_GEOMETRY_KEYS.slice(index * 3, index * 3 + 3).map((key: string) => <label key={key} title={key === geometry?.unsupported ? "此机型原生运动学不使用该偏置" : key.replaceAll("_", "-")}><span>{key.replaceAll("_", "-")}</span><input aria-label={key.replaceAll("_", "-")} type="number" step="any" disabled={locked || key === geometry?.unsupported} value={values[key] ?? "0"} onChange={(e) => setValues({ ...values, [key]: e.target.value })} /></label>)}</fieldset>)}</div>
+    <footer>
+      <button type="button" data-axis-control="geometry-apply" disabled={locked || !dirty} onClick={() => void run(() => onApply(edited()), "参数已应用，待重新回零")}><img src={axisIcon("tool_verify.gif")} alt="" />应用参数</button>
+      {tool("reload", "重新读取 INI", "tool_reload.gif", () => void run(onReload, "已重新读取 INI"))}
+      {tool("import", "导入 INI 参数", "tool_open.gif", () => file.current?.click())}
+      <button type="button" data-axis-control="geometry-save" disabled={locked} onClick={() => void run(exportIni, "INI 已保存或导出")}>保存 INI</button>
+      <output role="status">{message || (disabled ? "关机且程序空闲后可修改" : "")}</output>
+    </footer>
+    <input ref={file} type="file" accept=".ini" hidden onChange={(event) => {
+      const selected = event.target.files?.[0]; event.target.value = "";
+      if (!selected || !bundle || locked) return;
+      void run(async () => {
+        if (selected.name !== bundle.entrypoint.split("/").at(-1)) throw new Error("INI 文件名与机型不一致");
+        const imported = readTrtGeometry({ ...bundle, files: { ...bundle.files, [bundle.entrypoint]: await selected.text() } });
+        setValues(Object.fromEntries(TRT_GEOMETRY_KEYS.map((key: string) => [key, String(imported.offsets[key])])));
+      }, "INI 参数已导入，待应用");
+    }} />
+  </section>;
+}
diff --git a/web/react/src/XyzacMachineView.tsx b/web/react/src/XyzacMachineView.tsx
index afcf4f6..90682e2 100644
--- a/web/react/src/XyzacMachineView.tsx
+++ b/web/react/src/XyzacMachineView.tsx
@@ -145,6 +145,8 @@ export function XyzacMachineView({ visual, toolpath, view = "p", zoom = 1, rotat
       const state = visualRef.current, config = settings.current;
       assembly.update(state);
       const paths = (config.toolpath ?? state.toolpath) as Segment[];
+      pathGroup.position.copy(assembly.workOrigin.position);
+      liveGroup.position.copy(assembly.workOrigin.position);
       const pathKey = `${config.showPath}:${config.showLive}:${state.activeSegmentId}`;
       if (paths !== lastGeometry || pathKey !== lastPathKey) {
         clearLines(pathGroup); clearLines(liveGroup);
@@ -202,5 +204,6 @@ export function XyzacMachineView({ visual, toolpath, view = "p", zoom = 1, rotat
 
 export function XyzacMachineViewFromSnapshot({ snapshot, ...props }: Omit<Props, "visual"> & { snapshot: XyzacVisualSource | null | undefined }) {
   const visual = projectXyzacVisual(snapshot);
-  return <XyzacMachineView key={`${visual.machineModel?.id ?? "machine-model-pending"}:${visual.machineModel?.source_hash ?? ""}`} visual={visual} {...props} />;
+  const geometryKey = [visual.offsets.x_rot_point, visual.offsets.y_rot_point, visual.offsets.z_rot_point, visual.offsets.x_offset, visual.offsets.y_offset, visual.offsets.z_offset].join(":");
+  return <XyzacMachineView key={`${visual.machineModel?.id ?? "machine-model-pending"}:${visual.machineModel?.source_hash ?? ""}:${geometryKey}`} visual={visual} {...props} />;
 }
diff --git a/web/react/src/legacy.d.ts b/web/react/src/legacy.d.ts
index bd9825f..bf137c9 100644
--- a/web/react/src/legacy.d.ts
+++ b/web/react/src/legacy.d.ts
@@ -1,4 +1,7 @@
 declare module "*.mjs" {
+  export const TRT_GEOMETRY_KEYS: readonly string[];
+  export function readTrtGeometry(configuration: { entrypoint: string; files: Record<string, string> }): { coordinates: string; offsets: Record<string, number>; sources: Record<string, { path: string; line: number; value: string }>; unsupported: string; state_hash: string };
+  export function writeTrtGeometry<T extends { entrypoint: string; files: Record<string, string> }>(configuration: T, values: Record<string, string | number>): T;
   export type MachineDefinition = { id: string; label: string; coordinates: string; axes: readonly string[]; joint_count: number; entrypoint: string; program: string; switchkins_program: string; kinematics_type: number; runtime: string; model: string; source_path: string; offsets: Record<string, number>; joint_limits: Record<string, number[]>; axis_limits: Record<string, number[]> };
   export const MACHINE_DEFINITIONS: readonly MachineDefinition[];
   export const DEFAULT_MACHINE: MachineDefinition;
diff --git a/web/react/src/styles.css b/web/react/src/styles.css
index 1b87fb2..5cba5a0 100644
--- a/web/react/src/styles.css
+++ b/web/react/src/styles.css
@@ -173,6 +173,23 @@ output { font: 12px ui-monospace, monospace; text-align: right; }
 .axis-preview { display: flex; min-height: 0; flex: 1; padding: 4px; overflow: hidden; background: #000; }
 .axis-preview-split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px; width: 100%; min-width: 0; min-height: 0; }
 .axis-preview-pane { display: flex; min-width: 0; min-height: 0; overflow: hidden; }
+.axis-preview-machine { flex-direction: column; }
+.axis-preview-machine > .three-viewer { height: auto; min-height: 220px; }
+.trt-geometry { flex: 0 0 auto; background: #edf0f0; color: #202829; padding: 6px; font-size: 11px; border-top: 1px solid #899596; }
+.trt-geometry header, .trt-geometry footer { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
+.trt-geometry header strong { overflow-wrap: anywhere; }
+.trt-geometry header output { margin-left: auto; color: #276557; }
+.trt-geometry[data-dirty="true"] header output { color: #955015; }
+.trt-geometry-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 5px 0; }
+.trt-geometry fieldset { border: 0; padding: 0; min-width: 0; }
+.trt-geometry legend { color: #586467; padding: 0 0 3px; }
+.trt-geometry label { display: grid; grid-template-columns: minmax(0, 1fr) 66px; align-items: center; gap: 3px; margin: 3px 0; }
+.trt-geometry label span { overflow-wrap: anywhere; }
+.trt-geometry input { width: 100%; min-width: 0; height: 24px; padding: 2px 3px; border: 1px solid #a1adae; background: #fff; color: #202829; }
+.trt-geometry input:disabled { color: #879293; background: #e4e8e8; }
+.trt-geometry footer button { display: inline-flex; align-items: center; justify-content: center; gap: 4px; height: 27px; min-width: 28px; padding: 3px 5px; }
+.trt-geometry button img { width: 18px; height: 18px; object-fit: contain; }
+.trt-geometry footer output { flex: 1 1 100px; min-width: 0; overflow-wrap: anywhere; }
 .axis-preview-pane > .three-viewer { min-width: 0; min-height: 0; }
 .three-viewer { position: relative; width: 100%; height: 100%; min-height: 0; flex: 1; overflow: hidden; border: 1px solid #303030; background: #000; }
 .three-viewer canvas { display: block; width: 100%; height: 100%; }
@@ -258,7 +275,7 @@ output { font: 12px ui-monospace, monospace; text-align: right; }
   .axis-top-pane { grid-template-columns: 1fr; height: auto; min-height: 0; flex: 0 0 auto; }
   .axis-notebook { min-height: 330px; }
   .axis-preview { min-height: 732px; }
-  .axis-preview-split { grid-template-columns: 1fr; grid-template-rows: repeat(2, 360px); align-self: start; }
+  .axis-preview-split { grid-template-columns: 1fr; grid-template-rows: 360px 550px; align-self: start; }
   .axis-program-pane { flex: 0 0 auto; height: 740px; min-height: 740px; grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) 140px; }
   .program-main-layout { grid-template-columns: 1fr; grid-template-rows: minmax(0, 1fr) minmax(0, 1fr); grid-column: 1; grid-row: 1; overflow: hidden; }
   .program-editor-wrap { grid-column: 1; grid-row: 1; }
diff --git a/web/react/src/test_trt_parametric.mjs b/web/react/src/test_trt_parametric.mjs
new file mode 100644
index 0000000..de5ffd2
--- /dev/null
+++ b/web/react/src/test_trt_parametric.mjs
@@ -0,0 +1,128 @@
+import assert from "node:assert/strict";
+import { readFile, mkdir, writeFile } from "node:fs/promises";
+import * as THREE from "three";
+import createModule from "../../../build-wasm/linuxcnc-sim-core.js";
+import { readTrtGeometry, writeTrtGeometry, TRT_GEOMETRY_KEYS } from "../../workspace/trt-geometry.mjs";
+import { loadSimulationCase, toWorkerConfiguration } from "../../workspace/sim-case-loader.mjs";
+import { MACHINE_DEFINITIONS } from "../../workspace/machine-definitions.mjs";
+import { SimSession, CONTEXT_ID } from "../../worker/sim-session.mjs";
+import { fnv1a64 } from "../../worker/replay.mjs";
+import { buildXyzacMachine, buildXyzbcMachine } from "./xyzac-machine-model.ts";
+
+const root = new URL("../../../", import.meta.url);
+const fetchImpl = async (url) => {
+  try { const body = await readFile(new URL(String(url).replace(/^\//, ""), root), "utf8"); return { ok: true, text: async () => body }; }
+  catch { return { ok: false }; }
+};
+const wasmBinary = await readFile(new URL("build-wasm/linuxcnc-sim-core.wasm", root));
+const close = (a, b) => assert.ok(Math.abs(a - b) < 1e-7, `${a} != ${b}`);
+const rows = [];
+async function execute(bundle, source) {
+  const core = await createModule({ wasmBinary });
+  const session = new SimSession(core, { sessionId: "trt-parametric" }); let seq = 0;
+  const send = (kind, payload = {}) => session.accept({ schema_version: 1, context_id: CONTEXT_ID, session_id: session.sessionId, kind, seq: ++seq, operation_id: `param-${seq}`, payload });
+  send("HELLO"); send("SESSION_ATTACH");
+  const configuration = toWorkerConfiguration(bundle);
+  const expected = readTrtGeometry(bundle).offsets;
+  configuration.kinematics.offsets.x_rot_point = 999; // Files must win at the Worker boundary.
+  const loaded = send("LOAD_WORKSPACE", { root_path: "/workspace", configuration });
+  assert.equal(loaded.kind, "COMMAND_RESULT", JSON.stringify(loaded.payload));
+  assert.deepEqual(loaded.payload.panel_snapshot.kinematics.offsets, expected);
+  assert.equal(loaded.payload.panel_snapshot.visual.toolpath.length, 0);
+  assert.equal(session.wasmHomeLimit.read().state.homed, false);
+  const malformed = structuredClone(configuration);
+  malformed.files[bundle.entrypoint] = malformed.files[bundle.entrypoint].replace(/(x-rot-point\s+)[^\r\n;#]+/, "$1NaN");
+  assert.equal(send("LOAD_WORKSPACE", { root_path: "/workspace", configuration: malformed }).kind, "ERROR");
+  assert.deepEqual(session.xyzacKinematics.snapshot().offsets, expected);
+  const preview = send("PROGRAM_LOAD", { source, path: "parametric.ngc" });
+  assert.equal(preview.kind, "COMMAND_RESULT", JSON.stringify(preview.payload));
+  assert.ok(preview.payload.preview.segments.length > 0);
+  assert.equal(send("POWER", { active: true }).kind, "COMMAND_RESULT");
+  assert.equal(send("LOAD_WORKSPACE", { root_path: "/workspace", configuration }).kind, "ERROR");
+  assert.equal(send("HOME", { all: true }).kind, "COMMAND_RESULT");
+  for (let i = 0; i < 500 && !session.wasmHomeLimit.read().state.homed; i++) send("SIM_STEP", { cycles: 1 });
+  assert.equal(session.wasmHomeLimit.read().state.homed, true);
+  assert.equal(send("PROGRAM_RUN").kind, "COMMAND_RESULT");
+  assert.equal(send("PROGRAM_PAUSE").kind, "COMMAND_RESULT");
+  assert.equal(send("LOAD_WORKSPACE", { root_path: "/workspace", configuration }).kind, "ERROR");
+  assert.equal(send("PROGRAM_RESUME").kind, "COMMAND_RESULT");
+  const trace = [];
+  let result;
+  for (let i = 0; i < 4000; i++) {
+    result = send("SIM_STEP", { cycles: 10 });
+    assert.equal(result.kind, "COMMAND_RESULT", JSON.stringify(result.payload));
+    trace.push({ tick: result.simulation_tick, pose: result.payload.wasm_motion.state.position, joints: result.payload.wasm_motion.state.joint_commanded });
+    if (result.payload.program.program_status === "completed" && result.payload.wasm_motion.state.queue_depth === 0) break;
+  }
+  assert.equal(result.payload.program.program_status, "completed");
+  const coordinates = readTrtGeometry(bundle).coordinates;
+  const model = coordinates === "XYZAC" ? buildXyzacMachine() : buildXyzbcMachine();
+  const samples = [[0, 0], [20, 0], [0, 30], [-25, 45]];
+  for (const [tilt, c] of samples) {
+    const pose = { x: 12, y: 8, z: 6, a: 0, b: 0, c, u: 0, v: 0, w: 0, [coordinates[3].toLowerCase()]: tilt };
+    const inverse = session.xyzacKinematics.inverseMode(1, pose);
+    assert.equal(inverse.status, "verified");
+    model.update({ joints: inverse.joints, offsets: expected });
+    model.machine.updateMatrixWorld(true);
+    const point = model.workOrigin.localToWorld(new THREE.Vector3(pose.x * .01, pose.z * .01, pose.y * .01));
+    const tip = model.toolTip.getWorldPosition(new THREE.Vector3());
+    close(point.x, tip.x); close(point.y, tip.y); close(point.z, tip.z);
+  }
+  model.dispose();
+  send("POWER", { active: false });
+  const savedCheckpoint = session.createCheckpoint();
+  const savedCompact = session.createPowerOffCheckpoint();
+  const savedTrace = session.exportTrace();
+  const reloaded = send("LOAD_WORKSPACE", { root_path: "/workspace", configuration });
+  assert.equal(reloaded.kind, "COMMAND_RESULT");
+  assert.equal(session.wasmHomeLimit.read().state.homed, false);
+  assert.deepEqual(reloaded.payload.panel_snapshot.visual.toolpath, []);
+  const other = toWorkerConfiguration(writeTrtGeometry(bundle, { x_rot_point: expected.x_rot_point + 1 }));
+  assert.equal(send("LOAD_WORKSPACE", { root_path: "/workspace", configuration: other }).kind, "COMMAND_RESULT");
+  const beforeRecovery = session.xyzacKinematics.snapshot();
+  assert.equal(session.restoreCheckpoint(savedCheckpoint).status, "blocked");
+  assert.equal(session.restoreCompactPowerOff(savedCompact, seq + 1).status, "blocked");
+  assert.throws(() => session.importTrace(savedTrace), /trt_recovery_geometry_mismatch/);
+  assert.deepEqual(session.xyzacKinematics.snapshot(), beforeRecovery);
+  assert.equal(session.wasmHomeLimit.read().state.homed, false);
+  return { trace, offsets: expected, final: trace.at(-1), preview_hash: fnv1a64(preview.payload.preview), trace_hash: fnv1a64(trace), model_samples: samples.length };
+}
+
+for (const machine of MACHINE_DEFINITIONS) {
+  const bundle = await loadSimulationCase({ path: machine.entrypoint, fetchImpl });
+  assert.equal(bundle.status, "ready");
+  const initial = readTrtGeometry(bundle);
+  const values = { ...initial.offsets, x_rot_point: 9, y_rot_point: -7, z_rot_point: 13, z_offset: -4, [machine.coordinates === "XYZAC" ? "y_offset" : "x_offset"]: 15 };
+  const changed = writeTrtGeometry(bundle, values);
+  assert.notEqual(changed.state_hash, bundle.state_hash);
+  assert.deepEqual(readTrtGeometry(changed).offsets, values);
+  for (const bad of ["", "NaN", "Infinity", "1e309", "1+2", "0x10"]) assert.throws(() => writeTrtGeometry(bundle, { x_rot_point: bad }), /trt_geometry_number/);
+  assert.throws(() => writeTrtGeometry(bundle, { [initial.unsupported]: 1 }), /trt_geometry_unsupported/);
+  const edit = (fn) => ({ ...bundle, files: { ...bundle.files, [bundle.entrypoint]: fn(bundle.files[bundle.entrypoint]) } });
+  assert.throws(() => readTrtGeometry(edit((s) => s.replace(/(HALCMD = setp [^\n]*x-rot-point[^\n]*)/, "$1\n$1"))), /trt_geometry_duplicate/);
+  assert.throws(() => readTrtGeometry(edit((s) => s.replace(/HALCMD = setp [^\n]*x-rot-point[^\n]*\n/, ""))), /trt_geometry_missing/);
+  const crlf = edit((s) => s.replaceAll("\n", "\r\n"));
+  assert.ok(writeTrtGeometry(crlf, values).files[bundle.entrypoint].includes("\r\n"));
+  const referenced = edit((s) => s.replace(/(x-rot-point\s+)[^\r\n]+/, "$1[GEOMETRY]X\n").concat("\n[GEOMETRY]\nX = 4 # retained comment\n"));
+  const referencedEdit = writeTrtGeometry(referenced, { x_rot_point: 7 });
+  assert.equal(readTrtGeometry(referencedEdit).offsets.x_rot_point, 7);
+  assert.ok(referencedEdit.files[bundle.entrypoint].includes("X = 7 # retained comment"));
+  assert.ok(bundle.source_ini.includes("LIB:basic_sim.tcl"));
+  for (const key of TRT_GEOMETRY_KEYS.filter((key) => key !== initial.unsupported)) {
+    assert.equal(readTrtGeometry(writeTrtGeometry(bundle, { [key]: 3.25 })).offsets[key], 3.25);
+  }
+  const source = `G21 G90 G94\nM428\nG1 X12 Y8 Z6 ${machine.coordinates[3]}20 C30 F600\nM2\n`;
+  const baseline = await execute(bundle, source);
+  const modified = await execute(changed, source);
+  const repeated = await execute(changed, source);
+  assert.deepEqual(repeated.trace, modified.trace, "fixed tick replay must match");
+  assert.notDeepEqual(baseline.final.joints, modified.final.joints, "INI must change program machine joints");
+  assert.deepEqual(baseline.final.pose, modified.final.pose, "programming coordinates remain unchanged");
+  const divergent = baseline.trace.findIndex((sample, i) => JSON.stringify(sample.joints) !== JSON.stringify(modified.trace[i]?.joints));
+  assert.ok(divergent >= 0);
+  rows.push({ machine: machine.id, source, baseline, modified, repeat_hash: repeated.trace_hash, first_divergent_tick: baseline.trace[divergent].tick });
+}
+const report = { report_id: "trt-parametric-worker-v1", status: "verified", rows };
+const dir = new URL("coverage/trt-parametric/", root); await mkdir(dir, { recursive: true });
+await writeFile(new URL("worker.report.json", dir), JSON.stringify({ ...report, state_hash: fnv1a64(report) }, null, 2) + "\n");
+console.log(JSON.stringify({ report_id: report.report_id, status: report.status, machines: rows.map((r) => ({ machine: r.machine, first_divergent_tick: r.first_divergent_tick, trace_hash: r.modified.trace_hash })) }));
diff --git a/web/react/src/test_xyzac_threejs.mjs b/web/react/src/test_xyzac_threejs.mjs
index 6199dd5..9d5681d 100644
--- a/web/react/src/test_xyzac_threejs.mjs
+++ b/web/react/src/test_xyzac_threejs.mjs
@@ -54,7 +54,8 @@ assert.ok(xyzbcModel.machine.getObjectByName("tilt-b"));
 assert.equal(xyzbcModel.machine.getObjectByName("tilt-a"), undefined);
 xyzbcModel.update({ joints: [0, 0, 0, 30, 45], offsets: { x_rot_point: 0, y_rot_point: 0, z_rot_point: 0, x_offset: -20, y_offset: 0, z_offset: -15, tool_offset: 0 } });
 close(xyzbcModel.joints.tilt.rotation.z, -30 * Math.PI / 180);
-assert.equal(xyzbcModel.joints.tilt.rotation.y, Math.PI / 2);
+assert.equal(xyzbcModel.joints.tilt.rotation.y, 0);
+assert.equal(xyzbcModel.machine.getObjectByName("tilting-casting").rotation.y, Math.PI / 2);
 xyzbcModel.dispose();
 const original = structuredClone(visual);
 const zero = { joints: [0, 0, 0, 0, 0], offsets: { x_rot_point: 0, y_offset: 20, z_offset: 10, tool_offset: 0 } };
diff --git a/web/react/src/xyzac-machine-model.ts b/web/react/src/xyzac-machine-model.ts
index 9447c1d..c44562c 100644
--- a/web/react/src/xyzac-machine-model.ts
+++ b/web/react/src/xyzac-machine-model.ts
@@ -153,15 +153,14 @@ function buildTrtMachine(coordinates = "XYZAC") {
   cylinder(brackets, `${rotaryAxis}-axis-end-cap`, -107, 0, 0, 16, 3, "dark", "x");
 
   const tilt = group(tableX, `tilt-${rotaryAxis}`);
-  // The XYZBC source model applies a fixed 90 degree Z rotation before the
-  // B (source-Y) tilt. In the Three.js source-coordinate mapping that is a
-  // fixed Y rotation followed by a Z-axis dynamic tilt.
-  if (isXyzbc) tilt.rotation.y = Math.PI / 2;
+  // Rotate the B-axis casting without rotating the machine-coordinate frame.
+  const yoke = group(tilt, "tilting-casting");
+  if (isXyzbc) yoke.rotation.y = Math.PI / 2;
   if (isXyzbc) brackets.rotation.y = Math.PI / 2;
-  box(tilt, "yoke-plate", 0, 0, -30, 130, 80, 10, "teal", 2);
+  box(yoke, "yoke-plate", 0, 0, -30, 130, 80, 10, "teal", 2);
   for (const x of [-60, 60]) {
-    box(tilt, "yoke-side-plate", x, 0, -15, 10, 80, 34, "teal", 2);
-    cylinder(tilt, `${rotaryAxis}-trunnion-shaft`, x, 0, 0, 10, 22, "steel", "x");
+    box(yoke, "yoke-side-plate", x, 0, -15, 10, 80, 34, "teal", 2);
+    cylinder(yoke, `${rotaryAxis}-trunnion-shaft`, x, 0, 0, 10, 22, "steel", "x");
   }
   const rotaryBase = group(tilt, "c-rotary-base");
   box(rotaryBase, "c-drive-housing", 0, 0, -24, 104, 100, 12, "dark", 3);
@@ -194,6 +193,7 @@ function buildTrtMachine(coordinates = "XYZAC") {
     const xOffset = Number(state.offsets.x_offset ?? 0);
     const yOffset = Number(state.offsets.y_offset ?? 0);
     const zOffset = Number(state.offsets.z_offset ?? 0);
+    const pivot = new THREE.Vector3(state.offsets.x_rot_point * MM, Number(state.offsets.z_rot_point ?? 0) * MM, Number(state.offsets.y_rot_point ?? 0) * MM);
     tableX.position.x = -tableXJoint * MM;
     saddle.position.z = -saddleYJoint * MM;
     if (coordinates === "XYZBC") {
@@ -201,24 +201,23 @@ function buildTrtMachine(coordinates = "XYZAC") {
       // XYZBC is a table tilt: the source model rotates the B assembly
       // around machine Y. The Web scene maps source Y to Three.js Z.
       head.rotation.set(0, 0, 0);
-      zslide.position.y = 0;
+      zslide.position.y = 150 * MM;
       tilt.rotation.z = -tiltAJoint * DEG;
-      // xyzbc-trt-gui applies x-offset to both sides of the B table and
-      // applies z-offset with opposite signs to the inner/outer groups.
-      tilt.position.set(xOffset * MM, zOffset * MM, yOffset * MM);
+      tilt.position.set(xOffset * MM, zOffset * MM, 0).add(pivot);
       brackets.position.copy(tilt.position);
-      rotaryBase.position.set(xOffset * MM, -zOffset * MM, 0);
+      rotaryBase.position.set(-xOffset * MM, -zOffset * MM, 0);
     } else {
       zslide.position.y = (200 - spindleZJoint) * MM;
       head.position.y = 2;
       head.rotation.set(0, 0, 0);
       // XYZAC source transform: tilt.rotation.x = -tiltAJoint * DEG.
       tilt.rotation.x = -tiltAJoint * DEG;
-      tilt.position.set(0, zOffset * MM, yOffset * MM);
+      tilt.position.set(0, zOffset * MM, yOffset * MM).add(pivot);
       brackets.position.copy(tilt.position);
-      rotaryBase.position.copy(tilt.position).negate();
+      rotaryBase.position.set(0, -zOffset * MM, -yOffset * MM);
     }
     rotate.rotation.y = -rotateCJoint * DEG;
+    workOrigin.position.copy(pivot).negate();
     tool.position.y = -state.offsets.tool_offset * MM;
     if (toolLength !== state.offsets.tool_offset) {
       toolLength = state.offsets.tool_offset;
diff --git a/web/worker/sim-session.mjs b/web/worker/sim-session.mjs
index edd398e..6d33092 100644
--- a/web/worker/sim-session.mjs
+++ b/web/worker/sim-session.mjs
@@ -32,6 +32,7 @@ import { WasmXyzacDeviceIo } from "./wasm-xyzac-device-io.mjs";
 import { WasmProgramRuntime } from "./wasm-program-runtime.mjs";
 import { axisGate, xyzacGate, xyzacGateMatrix } from "../app/axis-contract.mjs";
 import { machineDefinition } from "../workspace/machine-definitions.mjs";
+import { readTrtGeometry, TRT_GEOMETRY_KEYS } from "../workspace/trt-geometry.mjs";
 
 const PROTOCOL_SCHEMA = 1;
 const CONTEXT_ID = "linuxcnc-2.10.0-pre0-wasm-m1-py-c1";
@@ -196,7 +197,7 @@ export class SimSession {
     // thousands of immutable segments on unrelated control responses makes a
     // loaded program delay abort/power/home commands behind structured-clone
     // work. Explicit preview transactions still publish the full replacement.
-    const publishXyzacToolpath = ["PROGRAM_LOAD", "PROGRAM_RESTART", "RECOVER", "SNAPSHOT_REQUEST", "VISUAL_CLEAR"].includes(input.kind);
+    const publishXyzacToolpath = ["LOAD_WORKSPACE", "PROGRAM_LOAD", "PROGRAM_RESTART", "RECOVER", "SNAPSHOT_REQUEST", "VISUAL_CLEAR"].includes(input.kind);
     const panelSnapshot = motionDelta || traceOnlyStep ? null : this.panelSnapshot({
       task,
       program,
@@ -600,6 +601,9 @@ export class SimSession {
     const program = this.xyzacProgram.snapshot();
     const io = this.xyzacIo?.canonical?.() ?? {};
     const wasmMotion = this.wasmMotion.read();
+    if (input.kind === "LOAD_WORKSPACE" && (io.ready || ["running", "paused"].includes(program.program_status) || Number(wasmMotion.state?.queue_depth) > 0)) {
+      return { enabled: false, reason: "trt_configuration_requires_power_off_idle" };
+    }
     if (["HOME", "SET_MODE"].includes(input.kind) && Number(wasmMotion.state?.queue_depth) > 0) return { enabled: false, reason: "xyzac_motion_active" };
     if (input.kind === "JOG_START" && !this.wasmHomeLimit.read().state.homed) return { enabled: false, reason: "xyzac_not_all_homed" };
     if (input.kind === "PROGRAM_LOAD" && wasmMotion.status === "verified" && Number(wasmMotion.state.queue_depth ?? 0) > 0) {
@@ -830,6 +834,12 @@ export class SimSession {
     return { ...compact, checkpoint_hash: fnv1a64(compact) };
   }
 
+  validateRecoveryGeometry(state) {
+    if (!this.xyzacKinematics) return;
+    const current = this.xyzacKinematics.snapshot();
+    if (!state?.kinematics || state.kinematics.coordinates !== current.coordinates || TRT_GEOMETRY_KEYS.some((key) => Number(state.kinematics.offsets?.[key] ?? 0) !== current.offsets[key])) throw new Error("trt_recovery_geometry_mismatch");
+  }
+
   restoreCompactPowerOff(record, transportSeq) {
     if (!record || record.schema !== "xyzac-power-off-checkpoint.v1" || record.context_id !== this.contextId || !record.state) return { status: "blocked", code: "runtime_checkpoint_schema", reason: "power_off_checkpoint_schema_invalid" };
     if (fnv1a64(record.state) !== record.state_hash || fnv1a64(Object.fromEntries(Object.entries(record).filter(([key]) => key !== "checkpoint_hash"))) !== record.checkpoint_hash) return { status: "blocked", code: "runtime_checkpoint_hash", reason: "power_off_checkpoint_hash_mismatch" };
@@ -839,6 +849,7 @@ export class SimSession {
     const liveLedger = this.ledger;
     const liveOperations = [...this.operations.values()];
     try {
+      this.validateRecoveryGeometry(state);
       if (!this.xyzacProgram || !state.program?.source_text) throw new Error("power_off_program_missing");
       const loaded = this.xyzacProgram.load(state.program.source_text, state.program.path ?? null);
       if (loaded.status !== "verified") throw new Error(loaded.code);
@@ -941,6 +952,7 @@ export class SimSession {
 
   importTrace(trace) {
     const validated = validateTrace(trace, { contextId: this.contextId });
+    this.validateRecoveryGeometry(trace.state);
     this.timeline = validated.timeline;
     this.created = Boolean(trace.state?.created);
     if (trace.state?.ledger?.entries) this.ledger = new OperationLedger(trace.state.ledger.entries);
@@ -977,6 +989,7 @@ export class SimSession {
   restoreCheckpoint(checkpoint, events = null, reconcile = undefined) {
     try {
       validateCheckpoint(checkpoint, { contextId: this.contextId });
+      this.validateRecoveryGeometry(checkpoint.state);
     } catch (error) {
       return { schema: "simulation-recovery.v1", status: "blocked", context_id: this.contextId, checkpoint_hash: checkpoint?.checkpoint_hash ?? null, blocked: [{ reason: String(error?.message ?? error) }] };
     }
@@ -1594,7 +1607,15 @@ export class SimSession {
         const rootPath = input.payload?.root_path;
         if (!text(rootPath) || !rootPath.startsWith("/") || rootPath.includes("..")) return finish(this.error(input, "workspace_path", "invalid_workspace_path"), "failed");
         let startupLoaded = false;
-        const configuration = input.payload?.configuration ?? null;
+        let configuration = input.payload?.configuration ?? null;
+        if (machineDefinition(configuration?.entrypoint) || machineDefinition(configuration?.kinematics?.type)) {
+          try {
+            const geometry = readTrtGeometry(configuration);
+            configuration = { ...configuration, kinematics: { ...configuration.kinematics, offsets: geometry.offsets } };
+          } catch (error) {
+            return finish(this.error(input, "trt_geometry", error.message), "failed");
+          }
+        }
         if (configuration) {
           this.machineDefinition = machineDefinition(configuration.entrypoint) ?? machineDefinition(configuration.kinematics?.type) ?? this.machineDefinition;
           this.workspaceFiles = { ...(configuration.files ?? configuration.workspace ?? configuration.workspace_files ?? {}) };
@@ -1669,6 +1690,9 @@ export class SimSession {
             ? new WasmLinuxcncTp(this.core, { cycleTime: this.xyzacMotionCycleTime, velocityLimit: this.xyzacRapidVelocity, accelerationLimit: Number(configuration.kinematics?.max_acceleration ?? 300), limits: configuration.home_limits ?? {} })
             : new WasmMotionQueue(this.core, { cycleTime: this.xyzacMotionCycleTime, velocityLimit: 1e9 });
           this.xyzacProgram = new WasmProgramRuntime(this.core);
+          this.previewState = null;
+          this.pendingXyzacMotion = null;
+          this.clearLivePlot();
           this.homingHistory = [];
           this.xyzacProgramKinematicsMode = XYZAC_MODES.identity;
           if (typeof this.wasmMotion.setKinematics === "function") this.wasmMotion.setKinematics(this.xyzacKinematics);
diff --git a/web/worker/test_boat_trt_programs.mjs b/web/worker/test_boat_trt_programs.mjs
index 816c4fe..38d37d2 100644
--- a/web/worker/test_boat_trt_programs.mjs
+++ b/web/worker/test_boat_trt_programs.mjs
@@ -37,5 +37,6 @@ for (const coordinates of ["XYZAC", "XYZBC"]) {
   assert.ok(Number.isFinite(result.payload.panel_snapshot.visual.pose[rotary]));
   assert.equal(result.payload.panel_snapshot.visual.machine_model.coordinate_system, coordinates);
   rows.push({ coordinates, program: programPath, status: result.payload.program.program_status, rotary });
+  assert.equal(send("POWER", { active: false }).kind, "COMMAND_RESULT");
 }
 console.log(JSON.stringify({ schema: "boat-trt-programs.v1", status: "verified", rows }));
diff --git a/web/worker/test_xyzac_trt_case.mjs b/web/worker/test_xyzac_trt_case.mjs
index c553fb3..833f69f 100644
--- a/web/worker/test_xyzac_trt_case.mjs
+++ b/web/worker/test_xyzac_trt_case.mjs
@@ -35,7 +35,9 @@ assert.equal(loaded.payload.motion_authority, "wasm");
 assert.equal(loaded.payload.configuration.state, "TASK_READY");
 assert.equal(loaded.payload.panel_snapshot.kinematics.joint_count, 5);
 assert.equal(send("POWER", "power-on", { active: true }).payload.status, "verified");
-assert.equal(send("HOME", "home-all", { all: true }).payload.wasm_home_limit.state.homed, true);
+assert.equal(send("HOME", "home-all", { all: true }).kind, "COMMAND_RESULT");
+for (let tick = 0; tick < 500 && !session.wasmHomeLimit.read().state.homed; tick++) send("SIM_STEP", `home-step-${tick}`, { cycles: 1 });
+assert.equal(session.wasmHomeLimit.read().state.homed, true);
 
 const switchRows = [];
 for (const [code, expected] of [["M429", 0], ["M428", 1], ["M430", 2]]) {
diff --git a/web/workspace/sim-case-loader.mjs b/web/workspace/sim-case-loader.mjs
index 0ddf7b6..57c8200 100644
--- a/web/workspace/sim-case-loader.mjs
+++ b/web/workspace/sim-case-loader.mjs
@@ -3,6 +3,7 @@ import { runtimeResourceFixture } from "./resource-resolver.mjs";
 import { SIM_CASE_CATALOG, SIM_FILE_INDEX, SIM_HAL_COMPONENTS } from "./sim-case-catalog.mjs";
 import { isOptionalSourceKey } from "./linuxcnc-source-semantics.mjs";
 import { MACHINE_DEFINITIONS, machineDefinition } from "./machine-definitions.mjs";
+import { readTrtGeometry } from "./trt-geometry.mjs";
 
 export const SIMULATION_CASE_SCHEMA = "simulation-case-bundle.v1";
 const RESOURCE_KEYS = new Set([
@@ -17,8 +18,8 @@ const CASE_KINEMATICS = Object.freeze({
   "linuxcnc/configs/sim/axis/corexy/corexy_by_hal.ini": Object.freeze({ type: "corexy", path_mode: "hal" }),
   "linuxcnc/configs/sim/axis/ldelta.ini": Object.freeze({ type: "lineardelta", path_mode: "kins" }),
   "linuxcnc/configs/sim/axis/rdelta.ini": Object.freeze({ type: "rotarydelta", path_mode: "kins" }),
-  "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzac-trt.ini": Object.freeze({ type: "xyzac-trt", path_mode: "wasm", coordinates: "XYZAC", joint_count: 5, max_linear_velocity: 35, axis_linear_velocity_limit: 20, max_acceleration: 300, max_jerk: 1000000000, servo_cycle_time: 0.001, task_cycle_time: 0.01, cycle_time: 0.001, switchkins: { 0: "identity", 1: "xyzac", 2: "userk" }, offsets: { x_rot_point: 0, y_offset: 20, z_offset: 10, tool_offset: 0 } }),
-  "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzbc-trt.ini": Object.freeze({ type: "xyzbc-trt", path_mode: "wasm", coordinates: "XYZBC", joint_count: 5, max_linear_velocity: 35, axis_linear_velocity_limit: 20, axis_angular_velocity_limit: 30, max_acceleration: 300, max_jerk: 1000000000, servo_cycle_time: 0.001, task_cycle_time: 0.01, cycle_time: 0.001, switchkins: { 0: "identity", 1: "xyzbc", 2: "userk" }, offsets: { x_rot_point: 0, y_rot_point: 0, z_rot_point: 0, x_offset: -20, y_offset: 0, z_offset: -15, tool_offset: 0 } }),
+  "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzac-trt.ini": Object.freeze({ type: "xyzac-trt", path_mode: "wasm", coordinates: "XYZAC", joint_count: 5, max_linear_velocity: 35, axis_linear_velocity_limit: 20, max_acceleration: 300, max_jerk: 1000000000, servo_cycle_time: 0.001, task_cycle_time: 0.01, cycle_time: 0.001, switchkins: { 0: "identity", 1: "xyzac", 2: "userk" } }),
+  "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzbc-trt.ini": Object.freeze({ type: "xyzbc-trt", path_mode: "wasm", coordinates: "XYZBC", joint_count: 5, max_linear_velocity: 35, axis_linear_velocity_limit: 20, axis_angular_velocity_limit: 30, max_acceleration: 300, max_jerk: 1000000000, servo_cycle_time: 0.001, task_cycle_time: 0.01, cycle_time: 0.001, switchkins: { 0: "identity", 1: "xyzbc", 2: "userk" } }),
 });
 const RUNTIME_FIXTURES = Object.freeze({
   "linuxcnc/configs/sim/axis/minimal_xyz.ini": Object.freeze({
@@ -130,7 +131,7 @@ function inManifest(path) {
 function responseUrl(baseUrl, path) { return `${String(baseUrl ?? "").replace(/\/$/, "")}/${path}`.replace(/^\//, "/"); }
 
 async function fetchText(fetchImpl, baseUrl, path) {
-  const response = await fetchImpl(responseUrl(baseUrl, path));
+  const response = await fetchImpl(responseUrl(baseUrl, path), { cache: "no-store" });
   if (!response?.ok) return null;
   return response.text();
 }
@@ -241,6 +242,7 @@ export async function loadSimulationCase({ path, fetchImpl = globalThis.fetch, b
       else { files[visualSource] = content; fetched.push(visualSource); }
     }
   }
+  const sourceIni = files[catalog.path];
   const fixture = RUNTIME_FIXTURES[catalog.path];
   if (fixture) {
     if (!inManifest(fixture.generated_hal)) missing.push(fixture.generated_hal);
@@ -267,6 +269,7 @@ export async function loadSimulationCase({ path, fetchImpl = globalThis.fetch, b
   };
   return {
     ...clone(unsigned),
+    source_ini: sourceIni,
     catalog,
     halManifest: [...new Set([...SIM_HAL_COMPONENTS, ...PRELOADED_HAL_COMPONENTS])].sort().map((component) => ({ component })),
     status: missing.length ? "blocked" : "ready",
@@ -276,6 +279,8 @@ export async function loadSimulationCase({ path, fetchImpl = globalThis.fetch, b
 
 export function toWorkerConfiguration(bundle) {
   if (!bundle || bundle.schema !== SIMULATION_CASE_SCHEMA) throw new Error("simulation_case_bundle_invalid");
+  const kinematics = CASE_KINEMATICS[bundle.entrypoint] ? clone(CASE_KINEMATICS[bundle.entrypoint]) : null;
+  if (machineDefinition(bundle.entrypoint)) kinematics.offsets = readTrtGeometry(bundle).offsets;
   return {
     entrypoint: bundle.entrypoint,
     files: clone(bundle.files),
@@ -285,7 +290,7 @@ export function toWorkerConfiguration(bundle) {
     runtime_fixtures: clone(bundle.runtime_fixtures ?? []),
     ...(bundle.entrypoint === "linuxcnc/configs/sim/axis/vismach/3axis-tutorial/3axis-tutorial.ini" ? { home_limits: { z: [-240, 100] } } : {}),
     ...(machineDefinition(bundle.entrypoint) ? { home_limits: { joint_count: 5, kinematics_type: machineDefinition(bundle.entrypoint).kinematics_type, coordinates: machineDefinition(bundle.entrypoint).coordinates, ...machineDefinition(bundle.entrypoint).joint_limits } } : {}),
-    ...(CASE_KINEMATICS[bundle.entrypoint] ? { kinematics: clone(CASE_KINEMATICS[bundle.entrypoint]) } : {}),
+    ...(kinematics ? { kinematics } : {}),
   };
 }
 
diff --git a/web/workspace/test_sim_case_loader.mjs b/web/workspace/test_sim_case_loader.mjs
index 8085f88..247bc7d 100644
--- a/web/workspace/test_sim_case_loader.mjs
+++ b/web/workspace/test_sim_case_loader.mjs
@@ -35,7 +35,11 @@ assert.equal(runtimeGenerated.status, "ready");
 assert.equal(runtimeGenerated.missing.length, 0);
 assert.equal(runtimeGenerated.files["linuxcnc/configs/sim/axis/sim-lathe.var"], "");
 assert.ok(runtimeGenerated.runtime_fixtures.some((row) => row.kind === "parameter_file"));
-const optionalGraphic = await loadSimulationCase({ path: "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzac-trt.ini", fetchImpl });
+const optionalGraphic = await loadSimulationCase({ path: "linuxcnc/configs/sim/axis/vismach/5axis/table-rotary-tilting/xyzac-trt.ini", fetchImpl: async (url) => {
+  const response = await fetchImpl(url);
+  if (!String(url).endsWith("xyzac-trt.ini")) return response;
+  return { ok: response.ok, text: async () => (await response.text()).replace(/INTRO_GRAPHIC\s*=\s*[^\r\n]+/, "INTRO_GRAPHIC = emc2.gif") };
+} });
 assert.equal(optionalGraphic.status, "ready");
 assert.ok(optionalGraphic.optional_missing.some((row) => row.path.endsWith("/emc2.gif")));
 const emptyOpenFile = await loadSimulationCase({ path: "linuxcnc/configs/sim/axis/anglejog/anglejog.ini", fetchImpl });
diff --git a/web/workspace/trt-geometry.mjs b/web/workspace/trt-geometry.mjs
new file mode 100644
index 0000000..3053fb5
--- /dev/null
+++ b/web/workspace/trt-geometry.mjs
@@ -0,0 +1,76 @@
+import { parseIni } from "./ini-parser.mjs";
+import { parseHalLine } from "./hal-configuration.mjs";
+import { WorkspaceRuntime } from "./runtime.mjs";
+import { machineDefinition } from "./machine-definitions.mjs";
+import { fnv1a64 } from "../worker/replay.mjs";
+
+export const TRT_GEOMETRY_KEYS = Object.freeze(["x_rot_point", "y_rot_point", "z_rot_point", "x_offset", "y_offset", "z_offset"]);
+const numeric = /^[+-]?(?:\d+(?:\.\d*)?|\.\d+)(?:e[+-]?\d+)?$/i;
+function fail(code, detail) { throw Object.assign(new Error(`${code}: ${detail}`), { code }); }
+
+export function readTrtGeometry({ entrypoint, files }) {
+  const machine = machineDefinition(entrypoint);
+  if (!machine) fail("trt_geometry_machine", entrypoint);
+  const parsed = parseIni({ workspace: new WorkspaceRuntime({ files }), entrypoint });
+  if (parsed.sections.TRAJ?.COORDINATES?.toUpperCase() !== machine.coordinates || parsed.sections.KINS?.KINEMATICS?.split(/\s+/)[0] !== `${machine.id}-kins`) fail("trt_geometry_machine_mismatch", entrypoint);
+  const commands = parsed.entries.filter((e) => e.section.toUpperCase() === "HAL" && e.key.toUpperCase() === "HALCMD")
+    .map((entry) => ({ entry, record: parseHalLine(entry.value, entry.line, parsed.sections) }));
+  const unsupported = machine.coordinates === "XYZAC" ? "x_offset" : "y_offset";
+  const offsets = { tool_offset: 0 };
+  const sources = {};
+  for (const key of TRT_GEOMETRY_KEYS) {
+    const pin = `${machine.id}-kins.${key.replaceAll("_", "-")}`;
+    const nets = commands.filter(({ record: r }) => r?.command === "net" && r.tokens.includes(pin));
+    const direct = commands.filter(({ record: r }) => r?.command === "setp" && r.tokens[0] === pin);
+    if (nets.length > 1 || nets.length && direct.length) fail("trt_geometry_ambiguous", pin);
+    const assignments = nets.length ? commands.filter(({ record: r }) => r?.command === "sets" && r.tokens[0] === nets[0].record.tokens[0]) : direct;
+    if (assignments.length > 1) fail("trt_geometry_duplicate", pin);
+    if (!assignments.length) {
+      if (key !== unsupported) fail("trt_geometry_missing", pin);
+      offsets[key] = 0;
+      continue;
+    }
+    const { entry, record } = assignments[0];
+    const value = record.tokens[1];
+    if (record.tokens.length !== 2 || !numeric.test(value) || !Number.isFinite(Number(value))) fail("trt_geometry_number", `${pin} @ ${entry.source}:${entry.line}`);
+    if (key === unsupported && Number(value) !== 0) fail("trt_geometry_unsupported", pin);
+    offsets[key] = Number(value);
+    // Follow INI references so editing updates the original scalar definition.
+    const rawValue = entry.value.trim().split(/\s+/).at(-1);
+    const reference = /^\[([^\]]+)\](.+)$/.exec(rawValue);
+    let source = entry;
+    if (reference) {
+      const definitions = parsed.entries.filter((e) => e.section === reference[1] && e.key === reference[2]);
+      if (definitions.length !== 1) fail("trt_geometry_reference", rawValue);
+      source = definitions[0];
+    }
+    sources[key] = { path: source.source, line: source.line, value: reference ? source.value : rawValue };
+    if (Object.entries(sources).some(([other, location]) => other !== key && location.path === source.source && location.line === source.line)) fail("trt_geometry_shared_definition", key);
+  }
+  return { coordinates: machine.coordinates, offsets, sources, unsupported, state_hash: fnv1a64({ entrypoint, offsets, sources }) };
+}
+
+export function writeTrtGeometry(configuration, values) {
+  const geometry = readTrtGeometry(configuration);
+  const files = { ...configuration.files };
+  for (const key of TRT_GEOMETRY_KEYS) {
+    const raw = String(values[key] ?? geometry.offsets[key]).trim();
+    if (!numeric.test(raw) || !Number.isFinite(Number(raw))) fail("trt_geometry_number", key);
+    if (key === geometry.unsupported && Number(raw) !== 0) fail("trt_geometry_unsupported", key);
+    const source = geometry.sources[key];
+    if (!source) continue;
+    const lines = files[source.path].split("\n");
+    const line = lines[source.line - 1];
+    const comment = line.search(/[;#]/);
+    const end = comment < 0 ? line.length : comment;
+    const body = line.slice(0, end);
+    const index = body.lastIndexOf(source.value);
+    if (index < 0) fail("trt_geometry_source_changed", key);
+    lines[source.line - 1] = body.slice(0, index) + String(Number(raw)) + body.slice(index + source.value.length) + line.slice(end);
+    files[source.path] = lines.join("\n");
+  }
+  const result = { ...configuration, files };
+  if ("state_hash" in result) result.state_hash = fnv1a64({ entrypoint: configuration.entrypoint, files });
+  readTrtGeometry(result);
+  return result;
+}