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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/SceneLoader.cpp
+4 -5
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@@ -283,10 +283,9 @@ void SceneLoader::applySidecarData(uint32_t mid, SidecarData data) {
}
if (!data.instances.empty() && !model.has_first_placement) {
using Mat4fCol = Eigen::Matrix<float, 4, 4, Eigen::ColMajor>;
using Mat4dCol = Eigen::Matrix<double, 4, 4, Eigen::ColMajor>;
model.first_placement =
Eigen::Map<const Mat4fCol>(data.instances[0].placement_transformation)
.cast<double>();
Eigen::Map<const Mat4dCol>(data.instances[0].placement_transformation);
model.has_first_placement = true;
}
@@ -356,9 +355,9 @@ void SceneLoader::onStreamerInstanceReady(InstanceChunk chunk) {
auto it = models_.find(loading_model_id_);
if (it != models_.end()) {
if (!it->second.has_first_placement) {
using Mat4fCol = Eigen::Matrix<float, 4, 4, Eigen::ColMajor>;
using Mat4dCol = Eigen::Matrix<double, 4, 4, Eigen::ColMajor>;
it->second.first_placement =
Eigen::Map<const Mat4fCol>(chunk.transform).cast<double>();
Eigen::Map<const Mat4dCol>(chunk.transform);
it->second.has_first_placement = true;
}
if (it->second.sidecar_builder) {