Use Z-up machine coordinates in GLB manager

2026-09-20 15:18:54 +08:00
parent 6d04425121
commit 8cafbb326b
10 changed files with 61 additions and 20 deletions
--- a/docs/glb-machine-manager/01-项目功能内容.md
+++ b/docs/glb-machine-manager/01-项目功能内容.md
@@ -13,7 +13,7 @@
   - 转台链：底座 → A/B → C → 工件。
 4. 每个部件可定义局部坐标原点。模型网格相对该原点偏移，运动关节围绕该原点运动。
 5. 每个部件可独立显示或隐藏原点坐标轴辅助线。
-6. 每个部件可用数值和 Three.js 操纵器平移、旋转；变换只修改装配配置，不修改原 GLB 字节。
+6. 每个部件可用数值和 Three.js 操纵器平移、旋转；变换只修改装配配置，不修改原 GLB 字节。Three.js 管理器使用机床右手坐标：机床 Z 轴朝上，机床 XY 为地面平面；GLB Y-up 坐标映射为 `Three(x,y,z) = Machine(x,z,-y)`。编辑器坐标轴、网格、平移、旋转和原点辅助统一使用此映射。
 7. 可定义 C 轴原点位置和 A/B 到 C 的运动学偏置。应用时写入底座场景节点及整机场景的 `userData.linuxcncMachineGeometry`，同时生成 URDF：
   - `C 原点 P = (x-rot-point, y-rot-point, z-rot-point)`。
   - `A/B 偏置 D = (x-offset, y-offset, z-offset)`。
--- a/docs/glb-machine-manager/03-推进台账.md
+++ b/docs/glb-machine-manager/03-推进台账.md
@@ -10,6 +10,13 @@
 - E05 浏览器验收通过，截图显示原有 MILL700 层级模型在管理器中可辨识；报告和截图位于 `coverage/glb-machine-manager/mill700/`。
 - 当前任务：MGR-10 已验证，等待保存和发布。

+## R04 / 2026-09-20 / Z-up 机床坐标映射
+
+- 用户要求将 Three.js 管理器坐标调整为 Z 轴朝上的机床坐标系。
+- 固定映射：`Machine(x,y,z) -> Three(x,z,-y)`，保持右手系；机床 XY 作为默认地面网格，机床 Z 对应 Three.js 竖直方向。
+- 管理器部件平移、局部原点、组合运行场景、原点辅助和 TransformControls 统一使用该映射；TransformControls 使用机床坐标代理，拖动结果反算为机床坐标。
+- MILL700 重新验收通过，蓝色 Z 轴在截图中竖直，浏览器错误为 0。MGR-11 verified。
+
 ## R02 / 2026-09-20 / 部件装配、标定、应用与验收完成

 - 新增 `machine-manager.ts`：通用自包含 GLB 部件加载、SHA-256、深复制、八角色和两条机械链校验、AC/BC URDF 生成、组合场景、底座/整机 userData、组合哈希。
--- a/docs/glb-machine-manager/04-任务矩阵.md
+++ b/docs/glb-machine-manager/04-任务矩阵.md
@@ -12,3 +12,4 @@
 |MGR-08 坐标一致性|verified|MGR-07|AC/BC 的 X/Y/Z/A或B/C、刀长、工件和路径由 WASM 状态正确驱动|
 |MGR-09 浏览器验收收口|verified|MGR-04,MGR-05,MGR-08|交互/错误/构建/浏览器截图报告通过，03–05 完整更新|
 |MGR-10 PBR 预览照明|verified|MGR-04|高金属度 GLB 在管理器中具有可辨识表面；PMREM、色彩空间、曝光和多向补光生效|
+|MGR-11 Z-up 机床坐标|verified|MGR-04,MGR-05|机床 Z 竖直、XY 地面、原点辅助与 TransformControls 统一使用 `Three(x,y,z)=Machine(x,z,-y)`|
--- a/docs/glb-machine-manager/05-验收证据.md
+++ b/docs/glb-machine-manager/05-验收证据.md
@@ -47,3 +47,9 @@
 - 结构：132 节点、126 网格、深度 6、126 材质，其中 110 个 `metalness >= 0.9`。
 - 检查：已有内部层级完整保留；管理器使用 `studio-pmrem`、sRGB 输出、ACES、曝光 `1.45` 和多向补光；浏览器错误为 0。
 - 截图：`coverage/glb-machine-manager/mill700/mill700-studio-lighting.png`，SHA-256 `0a20bac14708634ddf8e7267236488c3d28526477669ba16dcb880182e2ce11a`。
+
+## E06 / R04 / Z-up 坐标
+
+- 状态：verified。
+- 检查：管理器预览 DOM 标记 `data-machine-manager-coordinate-system=machine-z-up`、`data-machine-manager-axis-map=X:x,Y:-z,Z:y`；MILL700 截图中蓝色 Z 轴竖直，机床 XY 网格水平。
+- AC/BC 管理器浏览器闭环、MILL700 浏览器闭环、TypeScript、生产构建和控件契约继续通过。
--- a/docs/glb-machine-manager/06-决策记录.md
+++ b/docs/glb-machine-manager/06-决策记录.md
@@ -31,3 +31,7 @@ UI 允许用户选择父级以建立层级和发现错误；应用时只接受
 ## D08 / 编辑器照明不修改资产材质

 模型过暗通过 Three.js 场景的 PMREM 环境、色彩管理、曝光和补光解决。不得为了预览可见而覆盖导入材质的颜色、金属度、粗糙度或纹理，否则导出结果会偏离用户资产。
+
+## D09 / 管理器采用 Z-up 机床坐标
+
+Three.js/glTF 资产保持 Y-up 原始数据。管理器输入和显示采用机床右手坐标，映射为 `machine (x,y,z) -> Three (x,z,-y)`；这样机床 Z 对应 Three.js 竖直方向，机床 XY 落在默认地面网格，且不破坏右手系。所有部件平移、局部原点和旋转变换共用这套映射。
--- a/docs/glb-machine-manager/README.md
+++ b/docs/glb-machine-manager/README.md
@@ -11,7 +11,7 @@

 现有整机 GLB + 内嵌 URDF 导入能力继续保留。新管理器生成与现有 `linuxcnc.machine/1` 相同的严格结构，再通过已有配置、Worker、WASM 和 Three.js 投影链运行。

-当前状态：MGR-01 至 MGR-10 全部 verified，MILL700 实测证据为 `GLB-MGR-E05`。最新台账 R03，浏览器证据 `GLB-MGR-E01/E02/E05`，截图和报告位于 `coverage/glb-machine-manager/`。
+当前状态：MGR-01 至 MGR-11 全部 verified，MILL700 实测证据为 `GLB-MGR-E05`。最新台账 R04，浏览器证据 `GLB-MGR-E01/E02/E05`，截图和报告位于 `coverage/glb-machine-manager/`。

 文档：

--- a/scripts/test_machine_manager_browser.mjs
+++ b/scripts/test_machine_manager_browser.mjs
@@ -30,8 +30,8 @@ try {
  await control("machine-manager-settings").click(); assert.equal(await page.locator(".machine-manager-dialog[open]").count(), 1); assert.equal(await page.locator("[data-machine-manager-preview] canvas").count(), 1);
  await control("machine-manager-files").setInputFiles(fixtures);
  await page.waitForFunction(() => document.querySelector("[data-machine-manager-preview]")?.dataset.machineManagerPartCount === "8");
-  assert.equal(await page.locator(".machine-part-list > div").count(), 8); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-origin-count"), "8");
-  report.checks.push("eight GLB parts imported and rendered in the Three.js editor");
+  assert.equal(await page.locator(".machine-part-list > div").count(), 8); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-origin-count"), "8"); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-lighting"), "studio-pmrem"); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-exposure"), "1.45");
+  report.checks.push("eight GLB parts rendered with studio PMREM lighting and calibrated exposure");

  await control("machine-manager-show-origin").uncheck(); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-origin-count"), "7");
  const translation = page.locator("fieldset.machine-vector").filter({ hasText: "部件平移" }); await translation.getByLabel("X", { exact: true }).fill("10");
@@ -44,7 +44,7 @@ try {
  const cOrigin = calibrations.filter({ hasText: "C 轴原点" }); await cOrigin.getByLabel("X", { exact: true }).fill("24"); await cOrigin.getByLabel("Y", { exact: true }).fill("-12"); await cOrigin.getByLabel("Z", { exact: true }).fill("8");
  const offset = calibrations.filter({ hasText: "A 到 C 轴偏置" }); await offset.getByLabel("X", { exact: true }).fill("0"); await offset.getByLabel("Y", { exact: true }).fill("18"); await offset.getByLabel("Z", { exact: true }).fill("-45");
  const zeros = page.locator("fieldset.machine-zero"); await zeros.getByLabel("X", { exact: true }).fill("5"); await zeros.getByLabel("A", { exact: true }).fill("10"); await zeros.getByLabel("C", { exact: true }).fill("20");
-  assert.equal(await control("machine-manager-export").isDisabled(), false); const downloadPromise = page.waitForEvent("download"); await control("machine-manager-export").click(); const download = await downloadPromise; assert.equal(download.suggestedFilename(), "managed-xyzac.glb");
+  assert.equal(await control("machine-manager-export").isDisabled(), false); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-coordinate-system"), "machine-z-up"); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-axis-map"), "X:x,Y:-z,Z:y"); const downloadPromise = page.waitForEvent("download"); await control("machine-manager-export").click(); const download = await downloadPromise; assert.equal(download.suggestedFilename(), "managed-xyzac.glb");
  report.checks.push("validated assembly exports a self-contained managed GLB");
  assert.equal(await control("machine-manager-apply").isDisabled(), false); await control("machine-manager-apply").click();
  await page.waitForFunction(() => document.querySelector(".xyzac-machine-view")?.dataset.machineManagerSchema === "linuxcnc.machine-manager/1" && document.querySelector("main.axis-app")?.dataset.axisProgramLoading === "false", null, { timeout: 45000 });
--- a/scripts/test_machine_manager_mill700_browser.mjs
+++ b/scripts/test_machine_manager_mill700_browser.mjs
@@ -27,7 +27,7 @@ try {
  await page.waitForFunction(() => document.querySelector("[data-machine-manager-preview]")?.dataset.machineManagerPartCount === "1" && document.querySelector(".machine-part-list small")?.textContent === "MILL700-U_1.glb", null, { timeout: 60000 });
  assert.equal(hierarchy.root, "MILL700-U_1"); assert.equal(hierarchy.nodes, 132); assert.equal(hierarchy.meshes, 126); assert.ok(hierarchy.maxDepth >= 6); assert.ok(hierarchy.metallic > 20);
  report.hierarchy = hierarchy; report.checks.push("existing 132-node, depth-6 hierarchy preserved");
-  assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-lighting"), "studio-pmrem");
+  assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-lighting"), "studio-pmrem"); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-coordinate-system"), "machine-z-up"); assert.equal(await page.locator("[data-machine-manager-preview]").getAttribute("data-machine-manager-axis-map"), "X:x,Y:-z,Z:y");
  await page.locator(".machine-manager-dialog").screenshot({ path: new URL("mill700-studio-lighting.png", output).pathname }); report.checks.push("metallic MILL700 surfaces rendered with studio PMREM lighting; screenshot captured for visual review"); assert.deepEqual(errors, []); report.status = "verified";
 } catch (error) { report.status = "failed"; report.error = error instanceof Error ? error.stack : String(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(); }
--- a/web/react/src/MachineManagerPanel.tsx
+++ b/web/react/src/MachineManagerPanel.tsx
@@ -6,7 +6,7 @@ import { GLTFExporter } from "three/examples/jsm/exporters/GLTFExporter.js";
 import { RoomEnvironment } from "three/examples/jsm/environments/RoomEnvironment.js";
 import { DraggableDialog } from "./DraggableDialog";
 import { disposeMachineScene, type ImportedMachine } from "./imported-machine";
-import { buildManagedMachine, cloneMachinePartScene, expectedParentRole, loadMachinePart, MACHINE_PART_ROLES, roleLabel, type MachinePartDraft, type MachinePartRole, type PhysicalZero } from "./machine-manager";
+import { buildManagedMachine, cloneMachinePartScene, expectedParentRole, loadMachinePart, machineEulerToThreeQuaternion, machineFrameQuaternion, machineToThree, threeQuaternionToMachineEuler, threeToMachine, MACHINE_PART_ROLES, roleLabel, type MachinePartDraft, type MachinePartRole, type PhysicalZero } from "./machine-manager";
 import type { Vec3 } from "./machine-urdf";

 type Props = { coordinates: "XYZAC" | "XYZBC"; disabled: boolean; onApply: (machine: ImportedMachine) => Promise<void> };
@@ -26,33 +26,39 @@ function ManagerPreview({ parts, selectedId, mode, onTransform }: { parts: Machi
    const light = new THREE.DirectionalLight(0xfff5e5, 4.2); light.position.set(3, 5, 4); light.castShadow = true; scene.add(light);
    const fill = new THREE.DirectionalLight(0xdcefff, 2.4); fill.position.set(-4, 2, 3); scene.add(fill);
    const rim = new THREE.DirectionalLight(0xffffff, 1.8); rim.position.set(2, 4, -5); scene.add(rim);
-    const grid = new THREE.GridHelper(4, 40, 0x8eb0b2, 0x466266); scene.add(grid);
+    const grid = new THREE.GridHelper(4, 40, 0x8eb0b2, 0x466266); grid.name = "machine-xy-ground-grid-z-up"; scene.add(grid);
    const camera = new THREE.PerspectiveCamera(42, 1, .005, 100); camera.position.set(2.4, 1.8, 2.8);
    const orbit = new OrbitControls(camera, renderer.domElement); orbit.enableDamping = true;
    const root = new THREE.Group(); root.name = "machine-manager-preview"; scene.add(root);
    const nodes = new Map<string, THREE.Group>(); const disposable: THREE.Object3D[] = [];
    for (const part of parts) {
-      const node = new THREE.Group(); node.name = `draft_${part.id}`; node.visible = part.visible; node.position.fromArray(part.translationMm).multiplyScalar(.001); node.rotation.set(...part.rotationDeg.map(THREE.MathUtils.degToRad) as Vec3);
-      const visual = cloneMachinePartScene(part.scene); visual.position.fromArray(part.originMm).multiplyScalar(-.001); node.add(visual); disposable.push(visual);
-      const axes = new THREE.AxesHelper(.12); axes.name = `origin_${part.id}`; axes.visible = part.showOrigin; node.add(axes); root.add(node); nodes.set(part.id, node);
+      const node = new THREE.Group(); node.name = `draft_${part.id}`; node.visible = part.visible; node.position.fromArray(machineToThree(part.translationMm)).multiplyScalar(.001); node.quaternion.copy(machineEulerToThreeQuaternion(part.rotationDeg));
+      const visual = cloneMachinePartScene(part.scene); visual.position.fromArray(machineToThree(part.originMm).map((value) => -value) as Vec3).multiplyScalar(.001); node.add(visual); disposable.push(visual);
+      const axes = new THREE.Group(); axes.name = `origin_${part.id}`; axes.visible = part.showOrigin;
+      const axis = (end: THREE.Vector3, color: number) => { const geometry = new THREE.BufferGeometry().setFromPoints([new THREE.Vector3(), end]); axes.add(new THREE.Line(geometry, new THREE.LineBasicMaterial({ color }))); };
+      axis(new THREE.Vector3(.12, 0, 0), 0xff3333); axis(new THREE.Vector3(0, 0, -.12), 0x33cc66); axis(new THREE.Vector3(0, .12, 0), 0x3388ff); node.add(axes); root.add(node); nodes.set(part.id, node);
    }
    const cycle = (child: string, parent: string) => { let cursor: string | null = parent; const seen = new Set([child]); while (cursor) { if (seen.has(cursor)) return true; seen.add(cursor); cursor = parts.find((part) => part.id === cursor)?.parentId ?? null; } return false; };
    for (const part of parts) if (part.parentId && nodes.has(part.parentId) && !cycle(part.id, part.parentId)) nodes.get(part.parentId)!.add(nodes.get(part.id)!);
    const bounds = new THREE.Box3().setFromObject(root); const center = bounds.isEmpty() ? new THREE.Vector3() : bounds.getCenter(new THREE.Vector3()); const size = bounds.isEmpty() ? 1 : Math.max(bounds.getSize(new THREE.Vector3()).length(), .2);
    orbit.target.copy(center); camera.position.copy(center).add(new THREE.Vector3(size, size * .7, size * 1.15)); orbit.update();
    const transform = new TransformControls(camera, renderer.domElement); transform.setMode(mode); transform.setSpace("local"); scene.add(transform.getHelper());
-    const selected = selectedId ? nodes.get(selectedId) : null; if (selected) transform.attach(selected);
+    const selected = selectedId ? nodes.get(selectedId) : null; const proxy = selected ? new THREE.Group() : null;
+    const frameQuat = machineFrameQuaternion();
+    if (selected && proxy) { proxy.name = "machine-coordinate-transform-proxy"; proxy.position.copy(selected.getWorldPosition(new THREE.Vector3())); proxy.quaternion.copy(frameQuat).multiply(new THREE.Quaternion().setFromEuler(new THREE.Euler(...parts.find((part) => part.id === selectedId)!.rotationDeg.map(THREE.MathUtils.degToRad) as Vec3, "XYZ"))); scene.add(proxy); transform.attach(proxy); }
    transform.addEventListener("dragging-changed", ((event: { value?: boolean }) => { orbit.enabled = !event.value; }) as never);
-    transform.addEventListener("mouseUp", (() => {
-      if (!selectedId || !selected) return;
-      onTransformRef.current(selectedId, selected.position.toArray().map((value) => value * 1000) as Vec3, [THREE.MathUtils.radToDeg(selected.rotation.x), THREE.MathUtils.radToDeg(selected.rotation.y), THREE.MathUtils.radToDeg(selected.rotation.z)]);
+    transform.addEventListener("objectChange", (() => {
+      if (!selectedId || !selected || !proxy) return;
+      const local = selected.parent ? selected.parent.worldToLocal(proxy.position.clone()) : proxy.position.clone(); selected.position.copy(local);
+      const machineRotation = threeQuaternionToMachineEuler(proxy.quaternion); selected.quaternion.copy(machineEulerToThreeQuaternion(machineRotation));
+      onTransformRef.current(selectedId, threeToMachine(selected.position.toArray() as Vec3).map((value) => value * 1000) as Vec3, machineRotation);
    }) as never);
    const resize = () => { const width = Math.max(element.clientWidth, 1), height = Math.max(element.clientHeight, 1); camera.aspect = width / height; camera.updateProjectionMatrix(); renderer.setSize(width, height, false); };
    const observer = new ResizeObserver(resize); observer.observe(element); resize(); let frame = 0;
    const render = () => { orbit.update(); renderer.render(scene, camera); frame = requestAnimationFrame(render); }; render();
-    return () => { cancelAnimationFrame(frame); observer.disconnect(); transform.dispose(); orbit.dispose(); for (const object of disposable) disposeMachineScene(object); environment.dispose(); renderer.dispose(); renderer.domElement.remove(); };
+    return () => { cancelAnimationFrame(frame); observer.disconnect(); transform.dispose(); orbit.dispose(); if (proxy) proxy.removeFromParent(); for (const object of disposable) disposeMachineScene(object); environment.dispose(); renderer.dispose(); renderer.domElement.remove(); };
  }, [parts, selectedId, mode]);
-  return <div ref={host} className="machine-manager-preview" data-machine-manager-preview data-machine-manager-lighting="studio-pmrem" data-machine-manager-exposure="1.45" data-machine-manager-part-count={parts.length} data-machine-manager-origin-count={parts.filter((part) => part.showOrigin).length} data-transform-mode={mode} aria-label="三维机床装配预览" />;
+  return <div ref={host} className="machine-manager-preview" data-machine-manager-preview data-machine-manager-coordinate-system="machine-z-up" data-machine-manager-axis-map="X:x,Y:-z,Z:y" data-machine-manager-lighting="studio-pmrem" data-machine-manager-exposure="1.45" data-machine-manager-part-count={parts.length} data-machine-manager-origin-count={parts.filter((part) => part.showOrigin).length} data-transform-mode={mode} aria-label="三维机床装配预览，机床 Z 轴朝上" />;
 }

 export function MachineManagerPanel({ coordinates, disabled, onApply }: Props) {
--- a/web/react/src/machine-manager.ts
+++ b/web/react/src/machine-manager.ts
@@ -28,6 +28,23 @@ export const MACHINE_PART_ROLES: MachinePartRole[] = ["base", "x", "y", "z", "to
 export const roleLabel = (role: MachinePartRole, coordinates: string) => ({ base: "床身底座", x: "X 轴部件", y: "Y 轴部件", z: "Z 轴部件", tool: "主轴/刀具", tilt: `${coordinates === "XYZBC" ? "B" : "A"} 轴部件`, c: "C 轴部件", work: "工件/工作台" }[role]);
 export const expectedParentRole = (role: MachinePartRole): MachinePartRole | null => ({ base: null, x: "base", y: "x", z: "y", tool: "z", tilt: "base", c: "tilt", work: "c" }[role] as MachinePartRole | null);

+// glTF uses Y-up. The editor exposes the machine's right-handed X/Y/Z frame
+// with Z-up: machine (x, y, z) -> Three.js (x, z, -y).
+export const machineToThree = (value: Vec3): Vec3 => [value[0], value[2], -value[1]];
+export const threeToMachine = (value: Vec3): Vec3 => [value[0], -value[2], value[1]];
+export const machineFrameQuaternion = () => new THREE.Quaternion().setFromRotationMatrix(new THREE.Matrix4().set(1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1));
+export function machineEulerToThreeQuaternion(rotationDeg: Vec3) {
+  const machine = new THREE.Euler(...rotationDeg.map(THREE.MathUtils.degToRad) as Vec3, "XYZ");
+  const source = new THREE.Matrix4().makeRotationFromEuler(machine);
+  const frame = new THREE.Matrix4().set(1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1);
+  return new THREE.Quaternion().setFromRotationMatrix(frame.clone().multiply(source).multiply(frame.clone().invert()));
+}
+export function threeQuaternionToMachineEuler(rotation: THREE.Quaternion) {
+  const frame = machineFrameQuaternion();
+  const machine = frame.clone().invert().multiply(rotation);
+  return new THREE.Euler().setFromQuaternion(machine, "XYZ").toArray().slice(0, 3).map((radians) => THREE.MathUtils.radToDeg(Number(radians))) as Vec3;
+}
+
 const finite3 = (value: Vec3, label: string) => {
  if (value.length !== 3 || value.some((number) => !Number.isFinite(number))) throw new Error(`${label}需要三个有限数值`);
 };
@@ -120,10 +137,10 @@ export async function buildManagedMachine(input: { coordinates: "XYZAC" | "XYZBC
  for (const role of MACHINE_PART_ROLES) {
    const part = byRole.get(role)!;
    const placement = new THREE.Group(); placement.name = `component_${part.id}`; placement.visible = part.visible;
-    placement.position.fromArray(part.translationMm).multiplyScalar(.001);
-    placement.rotation.set(...part.rotationDeg.map(THREE.MathUtils.degToRad) as Vec3);
+    placement.position.fromArray(machineToThree(part.translationMm)).multiplyScalar(.001);
+    placement.quaternion.copy(machineEulerToThreeQuaternion(part.rotationDeg));
    placement.userData.machinePart = { role, filename: part.filename, hash: part.hash, originMm: [...part.originMm] };
-    const visual = cloneMachinePartScene(part.scene); visual.position.fromArray(part.originMm).multiplyScalar(-.001); placement.add(visual); links[role].add(placement);
+    const visual = cloneMachinePartScene(part.scene); visual.position.fromArray(machineToThree(part.originMm).map((value) => -value) as Vec3).multiplyScalar(.001); placement.add(visual); links[role].add(placement);
  }
  links.base.userData.linuxcncMachineGeometry = metadata;
  const signature = JSON.stringify({ metadata, hashes: MACHINE_PART_ROLES.map((role) => byRole.get(role)!.hash) });