When attempting to load a 3D Tiles dataset using vsgviewer, the model does not appear.
After some investigation,I found that the tileset contains a root transform and uses a region-based boundingVolume.
"boundingVolume": {
"region": [
-1.3197004795898053,
0.6988582109,
-1.3196595204101946,
0.6988897891,
0,
20
]
}
when loading this dataset, the bound of LOD and PagedLOD is caculated from the region-based boundingVolume,it's in the world coordinate.This seems to interfere with visibility culling or frustum testing, resulting in the model not being rendered.
As a temporary solution, I recomputed the bounds within the createTile function as follows:
vsg::dsphere computeSphere(vsg::ref_ptr<vsg::Node> node)
{
vsg::ComputeBounds computeBounds;
computeBounds.useNodeBounds = false;
node->accept(computeBounds);
vsg::dvec3 center = (computeBounds.bounds.min + computeBounds.bounds.max) * 0.5;
double radius = vsg::length(computeBounds.bounds.max - computeBounds.bounds.min) * 0.5;
return vsg::dsphere(center,radius);
}
vsg::ref_ptr<vsg::Node> Tiles3D::SceneGraphBuilder::createTile(vsg::ref_ptr<Tiles3D::Tile> tile, uint32_t level, const std::string& inherited_refine)
{
if (tile->children.values.empty())
{
}
else if (usePagedLOD)
{
auto plod = vsg::PagedLOD::create();
plod->bound = computeSphere(local_subgraph);
}
else // use LOD
{
auto lod = vsg::LOD::create();
lod->bound = computeSphere(highres_subgraph);
}
return {};
}
This modification allows the model to appear correctly. However, I'm unsure if this is the correct approach.
When attempting to load a 3D Tiles dataset using
vsgviewer, the model does not appear.After some investigation,I found that the tileset contains a root transform and uses a region-based boundingVolume.
when loading this dataset, the bound of
LODandPagedLODis caculated from the region-based boundingVolume,it's in the world coordinate.This seems to interfere with visibility culling or frustum testing, resulting in the model not being rendered.As a temporary solution, I recomputed the bounds within the
createTilefunction as follows:This modification allows the model to appear correctly. However, I'm unsure if this is the correct approach.