// Extracts an easily processable BVH tree from the packed version in the mesh data
public BVHNode getMeshBVH()
{
if (CompressedBVH.Size == 0 || CompressedBVH.GetArrayData() == null)
{
return(null);
}
BVHNode root = new BVHNode();
root.Min = new Vector3(BoundingBoxMin.X, BoundingBoxMin.Y, BoundingBoxMin.Z);
root.Max = new Vector3(BoundingBoxMax.X, BoundingBoxMax.Y, BoundingBoxMax.Z);
CompressedMeshBVHNode cnode = CompressedBVH.GetArrayData().Elements[0];
if ((cnode.IDX0 & 0x80) > 0)
{
root.Left = buildBVHTree(root.Min, root.Max, 1);
root.Right = buildBVHTree(root.Min, root.Max, ((((uint)cnode.IDX0 & 0x7F) << 8) | (uint)cnode.IDX1) * 2);
}
else
{
root.IsTerminal = true;
root.Index = (((uint)cnode.IDX0 & 0x7F) << 8) | (uint)cnode.IDX1;
}
return(root);
}
// Recursively builds the BVH tree from the compressed packed array
private BVHNode buildBVHTree(Vector3 parentBBMin, Vector3 parentBBMax, uint nodeIndex)
{
BVHNode node = new BVHNode();
CompressedMeshBVHNode cnode = CompressedBVH.GetArrayData().Elements[(int)nodeIndex];
node.Min = cnode.DecompressMin(parentBBMin, parentBBMax);
node.Max = cnode.DecompressMax(parentBBMin, parentBBMax);
if ((cnode.IDX0 & 0x80) > 0)
{
node.Left = buildBVHTree(node.Min, node.Max, nodeIndex + 1);
node.Right = buildBVHTree(node.Min, node.Max, nodeIndex + ((((uint)cnode.IDX0 & 0x7F) << 8) | (uint)cnode.IDX1) * 2);
}
else
{
node.IsTerminal = true;
node.Index = (((uint)cnode.IDX0 & 0x7F) << 8) | (uint)cnode.IDX1;
}
return(node);
}
