Method loadFromDesc

physx/source/physxcooking/src/BVHStructureBuilder.cpp:121–162

}

bool BVHStructureBuilder::loadFromDesc(const PxBVHStructureDesc& desc)
{
	PX_ASSERT(desc.isValid());

	const PxU32 numPrimitives = desc.bounds.count;

	// allocate one more for safe SIMD vec4 load
	mBounds = reinterpret_cast<PxBounds3*>(PX_ALLOC((numPrimitives + 1) * sizeof(PxBounds3), "PxBounds3"));

	const PxU8* sB = reinterpret_cast<const PxU8*>(desc.bounds.data);

	for(PxU32 i = 0; i < numPrimitives; i++)
	{
		inflateBounds(mBounds[i], *reinterpret_cast<const PxBounds3*>(sB));
	
		sB += desc.bounds.stride;
	}
	mNumVolumes = numPrimitives;

	// build the BVH
	AABBTreeBuildParams params;
	params.mNbPrimitives = desc.bounds.count;
	params.mAABBArray = mBounds;
	params.mLimit = NB_OBJECTS_PER_NODE;
	BuildStats stats;
	NodeAllocator nodeAllocator;

	const bool buildStatus = buildAABBTree(params, nodeAllocator, stats, mIndices);
	PX_UNUSED(buildStatus);
	PX_ASSERT(buildStatus);

	// store the computed hierarchy
	mNumNodes =  stats.getCount();
	mNodes = reinterpret_cast<BVHNode*>(PX_ALLOC(sizeof(BVHNode)*mNumNodes, "AABB tree nodes"));
	PX_ASSERT(mNumNodes==nodeAllocator.mTotalNbNodes);

	// store the results into BVHNode list
	flatten(nodeAllocator, mNodes);
	nodeAllocator.release();

	return true;
}

// A.B. move to load code
#define PX_BVH_STRUCTURE_VERSION 1