void TriangleBvh::BuildBVH()
{
if (faces.size() == 0)
return;
vector<BVHItem> buildData;
buildData.reserve(faces.size());
vector<uint32_t> prims(faces.size());
for (uint32_t i = 0; i < faces.size(); ++i)
{
Vec3f &v0 = positions[faces[i][0]];
Vec3f &v1 = positions[faces[i][1]];
Vec3f &v2 = positions[faces[i][2]];
Range3f bbox = ElementOperations::TriangleBoundingBox(v0, v1, v2);
buildData.push_back(BVHItem(i, bbox));
prims[i] = i;
}
ordered.reserve(faces.size());
uint64_t totalNodes = 0;
BVHBuildNode *root = RecursiveBuildBVH<uint32_t>(SPLIT_SAH, buildData.begin(), buildData.end(), &totalNodes, prims, ordered);
bvhNodes.resize(totalNodes);
uint32_t offset = 0;
FlattenBVHTree(root, bvhNodes, &offset);
}
void GroupBvh::BuildBVH()
{
if (groups.size() == 0)
return;
vector<BVHItem> buildData;
buildData.reserve(groups.size());
for (uint32_t i = 0; i < groups.size(); ++i)
{
Range3f bbox = groups[i]->ComputeBoundingBox();
buildData.push_back(BVHItem(i, bbox));
}
vector<RayEngine* > ordered;
ordered.reserve(groups.size());
uint64_t totalNodes = 0;
BVHBuildNode *root = RecursiveBuildBVH<RayEngine*>(SPLIT_SAH, buildData.begin(), buildData.end(), &totalNodes, groups, ordered);
groups = ordered;
bvhNodes.resize(totalNodes);
uint32_t offset = 0;
FlattenBVHTree(root, bvhNodes, &offset);
}
void SceneData::refreshBVH()
{
BVHItems objectItems;
for ( koi::RenderablePtr object : m_renderables )
{
const Bounds3f &bounds = object->getWorldBounds();
objectItems.push_back( BVHItem( bounds ) );
}
m_bvh = BVH( objectItems );
}
void SphereBvh::BuildBVH()
{
if (centers.size() == 0)
return;
vector<BVHItem> buildData;
buildData.reserve(centers.size());
vector<uint32_t> prims(centers.size());
for (uint32_t i = 0; i < centers.size(); ++i)
{
Range3f bbox = ElementOperations::SphereBoundingBox(centers[i], radius[i]);
buildData.push_back(BVHItem(i, bbox));
prims[i] = i;
}
ordered.reserve(centers.size());
uint64_t totalNodes = 0;
BVHBuildNode *root = RecursiveBuildBVH<uint32_t>(SPLIT_SAH, buildData.begin(), buildData.end(), &totalNodes, prims, ordered);
bvhNodes.resize(totalNodes);
uint32_t offset = 0;
FlattenBVHTree(root, bvhNodes, &offset);
}
