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Fix PLBVH raycast when only 1 small AABB is added to the tree.

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Jackson Lee 2014-03-11 17:43:29 -07:00
parent db02ced606
commit 1b85dad6b4
1 changed files with 14 additions and 0 deletions
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14
src/Bullet3OpenCL/BroadphaseCollision/b3GpuParallelLinearBvh.cpp
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@ -163,6 +163,20 @@ void b3GpuParallelLinearBvh::build(const b3OpenCLArray<b3SapAabb>& worldSpaceAab
//so it does not matter if numLeaves == 0 and rootNodeIndex == -1
int rootNodeIndex = numLeaves - 1;
m_rootNodeIndex.copyFromHostPointer(&rootNodeIndex, 1);
//Since the AABBs need to be rearranged(sorted) for the BVH construction algorithm,
//m_mortonCodesAndAabbIndicies.m_value is used to map a sorted AABB index to the unsorted AABB index
//instead of directly moving the AABBs. It needs to be set for the ray cast traversal kernel to work.
//( m_mortonCodesAndAabbIndicies[].m_value == unsorted index == index of m_leafNodeAabbs )
if(numLeaves == 1)
{
b3SortData leaf;
leaf.m_value = 0; //1 leaf so index is always 0; leaf.m_key does not need to be set
m_mortonCodesAndAabbIndicies.resize(1);
m_mortonCodesAndAabbIndicies.copyFromHostPointer(&leaf, 1);
}
return;
}