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IfcFileReader reported the coordination matrix only from the mesh callback, but GridReader always premultiplies every grid placement by it. A model that has no meshes (e.g. a grids-only IFC) kept identity coordinates while its grids were shifted, so FragmentsModels placed them off by the whole shift. Move the reporting into one helper and also call it before reading the grids, so the coordinates always match the shift the grids were given. Adds a grids-only-georeferenced.ifc fixture and a test that checks a grid's origin minus the model coordinates equals its IFC world placement. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Description
Fixes #356.
IfcFileReaderreported the coordination matrix as the model's coordinates only from theStreamMeshescallback, butGridReaderalways premultiplies every grid placement by that matrix. A model with no meshes (e.g. a grids-only IFC) kept identity coordinates while its grids were shifted, soFragmentsModelsplaced them off by the whole shift.This moves the reporting into one helper,
loadCoordinates(), called from the mesh callback as before and once more right beforeGridReaderruns. It is a no-op once coordinates were reported, so models with meshes are unchanged.How it was tested
resources/ifc/grids-only-georeferenced.ifc: a site at (500 km, 200 km, 12 m), one grid 10 m / 20 m / 3 m from it with aFootPrintcurve representation, and no other elements.grid-reader.test.tschecks that the coordinates are non-zero and that the grid's transform origin minus the coordinates equals its IFC world placement in three.js axes,(500010, 15, -200020).yarn install/ vitest in my environment, so the suite was not run locally. Instead I applied the same edit to a copy of the published 3.6.1dist/index.cjsand ran the same check with Node and web-ifc 0.0.78:(0, 0, 0)and an error of 500 km before;(-500010, -15, 200020)and an error of 1e-11 m after.grids-baseline.ifc,just_wall.ifc,school_str.ifc,dedup_repro.ifc: same coordinates before and after.What is the purpose of this pull request?
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