Rotated PDF reference and annotation acceptance (#4308)

Real WebGPU browser run, 2026-09-09, source 946e60f0d with the generated native sampler WASM (309cbc3f840d6191da1627b44c96d6a0f3de722e777c8868d682aa3f11488978). The source is the public HABS Cyclorama floor-plan sheet used in the existing PDF acceptance. The page was rotated 90 degrees, cropped through the visible crop marquee, and calibrated using its printed 193 feet 4 inches dimension (58.928 metres).

The mounted Author → Appearance workspace placed both horizontal (xy) and vertical (xz) independent references. Closing and reopening the dock retained the PDF rotation, crop, landmarks, and measured span. Hiding, locking, unlocking, and showing the first reference worked. Save into Model created HABS plan annotation and HABS facade annotation. Undo removed only the second IFC annotation; Redo restored it. Hiding both independent references retained both saved annotation meshes. Normal IFC + images export produced an IFCZIP. redo.json, result.json, and drawing-registration.json record this run.

The independent IfcOpenShell 0.8.2 reader ran full EXPRESS validation on that export with zero errors. Its native geometry engine produced two triangles per annotation. Independently resolving each indexed UV corner through IFC placement and units produced exactly the registered world corners (maximum error zero). The archived PNG's SHA-256 matched the source asset for both owners. See independent-plan.json and independent-facade.json.

Reproduce the reader check with the exported archive and committed snapshot:

python3 ../reference-annotation/verify-export.py annotations.ifczip redo.json \
  'HABS plan annotation' independent-plan.json --reference-index 0
python3 ../reference-annotation/verify-export.py annotations.ifczip redo.json \
  'HABS facade annotation' independent-facade.json --reference-index 1

A separate fresh browser loaded that archive and shared it through an isolated local signed relay. A new guest, another fresh guest after both earlier contexts closed, and a normal reopen of the room export retained both annotations. Every oriented triangle corner, UV coordinate, decoded image pixel hash, and clamp sampler matched. Annotation GUIDs survived as IFCX paths with the expected / prefix. Actual mouse selection of the horizontal annotation passed in all four sessions; room-reopened-selected.png shows the final reopened result. room-result.json records all comparisons. The room transport proof is decoded pixel equality, not original encoded PNG byte preservation. The relay was local; this does not assert a deployed production-room test.

Independent references remain registration records, not shared IFC products. This room acceptance covers the saved annotations. The generated IFCZIP and room tokens are intentionally not committed.

Calibrated reference in the 2D canvas

The follow-up browser run includes canvas source 2c0f98359. After placing the same two references through the dock, the user-facing Section tool opened its 2D panel. Resizing and Fit to view, followed by Down and Front cuts, showed the complete rotated/cropped PDF in both views (drawing-plan.png and drawing-front.png). This exercises independent references, before creating IFC annotations.

The run observed the actual Canvas2D drawImage transforms while still calling the original drawing method. canvas-oracle.json records those matrices and all four resulting screen corners, each inside the 950 × 711 canvas. Dividing the rendered edge lengths by the registered IFC edge lengths gives the same scale in both directions (difference below 0.000001 pixels/metre). Independently inverting the recorded PDF-to-raster affine transform maps the chosen printed dimension to 58.928 metres in both views, within 0.00001 metre. This complements the independent IFC-reader world-corner check; it does not claim PDF/SVG/DXF export of these independent canvas references.