# M16-GAP-00034 Status

status: done
task: BUILD modifier LOCAL_EXACT slice
updated: 2026-08-20 America/New_York

scope: BUILD modifier identity, frame start/length, randomization flags/seed and visibility modes for `mesh:WebGapBuildMesh`.

evidence:

- Desktop fixture exposes `WebGapBuild` with start 3, length 12 and stable seed; save/reopen is exact.
- Fixed reader field decoding for BUILD `randomize`/`seed` and rebuilt the Chromium WASM engine; WASM/Main exposes matching fields from the same fixture.
- Malformed Blend input is rejected without mutating Main.
- `npm --prefix web run test:generated-gap -- --task M16-GAP-00034` and `node tools/web/check-generated-gap.mjs --task M16-GAP-00034` exited 0.

knownRisk: Full evaluated Build geometry and editor mutation remain outside this metadata/local-exact modifier slice.

nextTask: `M16-GAP-00035`