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Phase D — Model Preview + preview polish

Status: complete (2026-04-20).

All in-scope Phase D work shipped: saved viewpoints (D-3), 2D/3D toggle (D-4), model placement sourcing (D-5), Fit All / Fit Selected (D-6), background image display (D-7), preview image export (D-10), House Preview transport parity (D-11), "View Objects" toggle (D-13), and alternate LayoutGroup previews (D-14). 2D-mode core render fixes (virtual canvas size from <settings><previewWidth/Height>, Display2DCenter0 in the view matrix, correct is_3d flag to DisplayModelOnWindow) all landed.

Explicitly dropped

  • D-12 pixel / point-size control — no desktop counterpart; iPad keeps the hardcoded 2.0 to avoid misleading users diffing the two clients.
  • D-15 FPS / render-time overlay — diagnostic noise that caused support confusion.

Deferred to other plans

  • Layout-editor overlays and authoring (model name / info / first-pixel labels, 2D grid / bbox overlays, drag-to-move, resize handles, polyline editing, property grid, align / distribute, CAD/DXF export, wiring view, bulk edit) — parked in future-layout-editing.md. Display2DCenter0 is already in the view matrix; only the grid/bbox overlays themselves are parked.
  • Per-model show/hide and Views management — covered by Phase F-6 Display Elements editor (already complete).
  • Detached-scene-owned preview state (per-scene is3D, camera, layoutGroup) — Phase F deferral; detached scenes share the main window's preview state via the @Observable view model.

Caveats

  • The "View Objects" toggle is a single coarse switch over background image + house mesh / terrain / gridlines / ground images. Future per-category toggles would need new UI.
  • Fit Selected uses viewModel.previewModelName and silently no-ops when the selected model isn't visible in the active layout group — not an error state, but worth knowing if a tester reports "Fit Selected does nothing".