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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/GeometryStreamer.cpp
+9 -4
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@@ -619,8 +619,9 @@ void GeometryStreamer::run(const std::string& path, int num_threads) {
// Vertex rebasing cont.: post-multiply the per-instance
// PlacementTransformation by T(+offset) so world position is
// preserved. Matrix arithmetic is in double; narrow to float
// at the end.
// preserved. Keep the emitted placement in double so later
// CoordinateOperation / false-origin composition can cancel
// large translations before the final GPU float upload.
Eigen::Matrix4d mat_d =
tri_elem->transformation().data()->ccomponents();
if (mesh_aabbs[local_mesh_id].has_offset) {
@@ -637,11 +638,15 @@ void GeometryStreamer::run(const std::string& path, int num_threads) {
inst.object_id = object_id;
inst.color_override_rgba8 = 0;
for (int i = 0; i < 16; ++i) {
inst.transform[i] = static_cast<float>(mat_d.data()[i]);
inst.transform[i] = mat_d.data()[i];
}
const MeshAabb& ma = mesh_aabbs[local_mesh_id];
worldAabbFromLocal(ma.lmin, ma.lmax, inst.transform,
float mat_f[16];
for (int i = 0; i < 16; ++i) {
mat_f[i] = static_cast<float>(inst.transform[i]);
}
worldAabbFromLocal(ma.lmin, ma.lmax, mat_f,
inst.world_aabb_min, inst.world_aabb_max);
emit instanceReady(std::move(inst));