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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/tests/test_sidecar_cache.cpp
+2 -2
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@@ -89,7 +89,7 @@ SidecarData buildFixture() {
inst.color_override_rgba8 = uint32_t(0xAA000000u | (i * 0x010203u));
inst.model_id = 1;
for (int k = 0; k < 16; ++k) {
inst.placement_transformation[k] = float(i) * 0.25f + float(k);
inst.placement_transformation[k] = double(i) * 0.25 + double(k);
inst.transform[k] = float(i) * 0.5f + float(k);
}
inst.world_aabb_min[0] = float(i);
@@ -155,7 +155,7 @@ bool sidecarDataEqual(const SidecarData& a, const SidecarData& b) {
TEST_CASE("MeshInfo and InstanceCpu have stable layouts (sidecar wire format)", "[sidecar]") {
REQUIRE(sizeof(MeshInfo) == 56);
REQUIRE(sizeof(InstanceGpu) == 80);
REQUIRE(SIDECAR_VERSION == 11);
REQUIRE(SIDECAR_VERSION == 12);
REQUIRE(SIDECAR_MAGIC == 0x49465657u);
}