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Preserve precise viewer placements

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Keep placement transformations in double precision through streaming, sidecar caching, and viewport recomposition so large coordinates can be cancelled before the final GPU float upload.

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Dion Moult
2026-05-19 17:31:53 +10:00
parent 8b8fafa698
commit e0a504417c
10 changed files with 51 additions and 40 deletions
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src/ifcviewer/SidecarCache.h
+5 -1
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@@ -59,7 +59,11 @@ static constexpr uint32_t SIDECAR_MAGIC = 0x49465657; // "IFVW"
// georef without re-parsing the IFC source. Edits to the IFC's
// IfcMapConversion do NOT invalidate the sidecar — delete the
// .ifcview manually if you change the source's georef parameters.
static constexpr uint32_t SIDECAR_VERSION = 11;
// v12 = InstanceCpu::placement_transformation is double[16], and
// InstanceChunk carries the streamer placement as double[16]. This keeps
// large IFC placements exact until CoordinateOperation / FederatedFalseOrigin
// composition has reduced them to viewport-local float-sized values.
static constexpr uint32_t SIDECAR_VERSION = 12;
static constexpr uint32_t SIDECAR_ENDIAN = 0x01020304;
// Fixed-size element record. Strings are stored as (offset, length) pairs