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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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This commit is contained in:
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/SidecarBuilder.cpp
+7 -8
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@@ -105,16 +105,15 @@ void SidecarBuilder::onInstanceReady(const InstanceChunk& chunk) {
inst.color_override_rgba8 = chunk.color_override_rgba8;
inst.model_id = chunk.model_id;
// The streamer's chunk.transform is the placement_transformation. With
// identity stage matrices (no FederatedFalseOrigin / ModelTransformation
// / CoordinateOperation applied yet), transform == placement_transformation
// and chunk.world_aabb_* is already the world AABB. ViewportWindow's
// applyCachedModel will recompose against the consumer's stage matrices
// at load time, so the cached transform/world_aabb is just a sensible
// identity-stage baseline.
// The streamer's chunk.transform is the double-precision
// placement_transformation. The cached float transform/world_aabb is only
// an identity-stage baseline; applyCachedModel recomposes from placement
// against the consumer's stage matrices at load time.
std::memcpy(inst.placement_transformation, chunk.transform,
sizeof(inst.placement_transformation));
std::memcpy(inst.transform, chunk.transform, sizeof(inst.transform));
for (int i = 0; i < 16; ++i) {
inst.transform[i] = static_cast<float>(chunk.transform[i]);
}
std::memcpy(inst.world_aabb_min, chunk.world_aabb_min, sizeof(inst.world_aabb_min));
std::memcpy(inst.world_aabb_max, chunk.world_aabb_max, sizeof(inst.world_aabb_max));