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Derive map units from IFC scale

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Use IfcMapConversion.Scale as the source of truth for converting map coordinates to metres, instead of deriving that scale from IfcProjectedCRS.MapUnit. Bump the sidecar version because cached georef matrices and unit scales may differ under the new interpretation.

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This commit is contained in:
Dion Moult
2026-05-19 18:58:17 +10:00
parent e0a504417c
commit 6ca38f8bf6
7 changed files with 41 additions and 24 deletions
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src/ifcviewer/Federation.h
+5 -4
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@@ -100,10 +100,11 @@ struct ModelTransformation {
Eigen::Vector3d pivot = Eigen::Vector3d::Zero(); // federation unit
};
// Per-model unit scales captured at load time. project_length_to_meters
// comes from calculateUnitScale(file, "LENGTHUNIT"); map_unit_to_meters from
// siScaleFromNamedUnit(getMapUnit(file)) and falls back to the project length
// scale when the model has no MapUnit.
// Per-model unit scales captured at load time. project_length_to_meters comes
// from calculateUnitScale(file, "LENGTHUNIT"). map_unit_to_meters is derived
// from IfcMapConversion.Scale as project_length_to_meters / Scale; the
// IfcProjectedCRS.MapUnit named unit is metadata and does not affect the
// transform composition.
struct ModelUnits {
double project_length_to_meters = 1.0;
double map_unit_to_meters = 1.0;