An Efficient and Robust Ray-Box Intersection Algorithm
Amy L. Williams, Steve Barrus, R. Keith Morley, Peter Shirley · Journal of Graphics Tools · 2005
The computational bottleneck in a ray tracer using bounding volume hierarchies is often the ray intersection routine with axis-aligned bounding boxes. We describe a version of this routine that uses IEEE numerical properties to ensure that those tests are both robust and efficient. Sample source code is available online.