# Progress: Milestone 1 - 3D Dimensions & Billboard Annotations

- **Agent**: teamwork_preview_worker_m1_1
- **Status**: COMPLETED
- **Last visited**: 2026-10-04T03:43:00Z

## Steps
- [x] Step 0: Initialize DISPATCH.md, BRIEFING.md, and progress.md
- [x] Step 1: Read and analyze mandatory input files (ORIGINAL_REQUEST.md, PROJECT.md, survey handoff.md, AGENTS.md, GEMINI.md)
- [x] Step 2: Examine `app/static/bim/index.html` structure and existing elements
- [x] Step 3: Implement Milestone 1 logic:
  - Created `const groupDimensions = new THREE.Group();` and `window.groupDimensions = groupDimensions;`
  - Implemented `createDimensionSprite(text, options)` with 2x supersampled canvas, Dark Slate pill styling, and billboard sprites
  - Implemented `addLinearDimension3D(pA, pB, extDir, offset, label, options)` with extension lines, dimension line, 45° architectural slash ticks, and billboard sprites
  - Implemented `addAlignmentSegmentDimension(sStart, sEnd, yElev, label, options)` with curved polyline sampling along alignment
  - Populated all 21 3D dimensions matching the 28 construction drawings across 4 AEC categories
  - Integrated layer toggle `#chkDimensions` in sidebar and quick toggle `#btnDims` in floating overlay
- [x] Step 4: Validate syntax and verify tests:
  - JS syntax check: 100% passed
  - Headless Chrome Playwright verification: 0 console errors, 41 children (21 sprites, 20 lines), toggle tests passed
  - Architecture boundary enforcement: `pytest tests/test_architecture_boundary_enforcement.py -v` (5/5 PASSED)
- [x] Step 5: Complete handoff report and notify parent orchestrator