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Fixed crash with MaxVerticesPerPosition being set too low.

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This commit is contained in:
Daviw Williams 2013-02-04 16:38:50 +01:00
parent 8ad0cae89a
commit 8d2061bdb5
1 changed files with 5 additions and 6 deletions
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library/PolyVoxCore/include/PolyVoxCore/CubicSurfaceExtractor.inl
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@ -26,13 +26,12 @@ namespace PolyVox
// We try to avoid duplicate vertices by checking whether a vertex has already been added at a given position.
// However, it is possible that vertices have the same position but different materials. In this case, the
// vertices are not true duplicates and both must be added to the mesh. As far as I can tell, it is possible to have
// at most six vertices with the same position but different materials. This worst-case scenario happens when we
// have a 2x2x2 group of voxels (all with different materials) and then we delete two voxels from opposing corners.
// The vertex position at the center of this group is then going to be used by six quads all with different materials.
// One futher note - we can actually have eight quads sharing a vertex position (imagine two 1x1x10 rows of voxels
// sharing a common edge) but in this case all eight quads will not have different materials.
// at most eight vertices with the same position but different materials. For example, this worst-case scenario
// happens when we have a 2x2x2 group of voxels, all with different materials and some/all partially transparent.
// The vertex position at the center of this group is then going to be used by all eight voxels all with different
// materials.
template<typename VolumeType, typename IsQuadNeeded>
const uint32_t CubicSurfaceExtractor<VolumeType, IsQuadNeeded>::MaxVerticesPerPosition = 6;
const uint32_t CubicSurfaceExtractor<VolumeType, IsQuadNeeded>::MaxVerticesPerPosition = 8;
template<typename VolumeType, typename IsQuadNeeded>
CubicSurfaceExtractor<VolumeType, IsQuadNeeded>::CubicSurfaceExtractor(VolumeType* volData, Region region, SurfaceMesh<PositionMaterial>* result, WrapMode eWrapMode, typename VolumeType::VoxelType tBorderValue, bool bMergeQuads, IsQuadNeeded isQuadNeeded)