Ray Tracing, Bounding Volume Hierarchy, Bvh, Axis Aligned, Tetrahedron Octahedron.
Hank Weghorst, Gary Hooper, Donald P. Greenberg: Improved Computational Methods for Ray Tracing, ACM Transcations on Graphics, 1984 A. Iones, S. Zhukov, A. Krupkin: On optimality of OBBs for visibility tests for frustum culling, ray shooting and collision detection, Proceedings Computer Graphics