Parallel Transformation of Bounding Volume Hierarchies into Oriented Bounding Box Trees

Oriented bounding box (OBB) hierarchies can be used instead of based on axis-aligned boxes (AABB), providing tighter fitting to the underlying geometric structures and resulting in improved interference tests, such as ray-geometry intersections. In this paper, we present a method for fast, parallel transformation an existing volume hierarchy (BVH), AABBs, into oriented boxes. To end, parallelise high-quality OBB extraction algorithm from literature operate standalone estimator further extend it efficiently build bottom up manner. This agglomerative approach allows fast execution formation arbitrary, OBBs hierarchies. The is fully implemented GPU extensively evaluated with ray