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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/SidecarCache.cpp
+2 -2
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@@ -17,7 +17,7 @@
* *
********************************************************************************/
// v12 layout (all multi-byte fields native-endian; endianness marker in header).
// v13 layout (all multi-byte fields native-endian; endianness marker in header).
//
// SidecarHeader (12 bytes)
//
@@ -30,7 +30,7 @@
// MeshInfo[num_meshes]
//
// uint32_t num_instances
// InstanceCpu[num_instances] (already sorted by mesh_id; v12 layout)
// InstanceCpu[num_instances] (already sorted by mesh_id; v13 layout)
//
// uint32_t has_coordinate_operation (v11+)
// double[16] coordinate_operation_meters (v11+; column-major)