Raytracing, Rendering, Algorithms,,

Bidirectional Path Tracing and Multiple Importance Sampling (2 Minute Papers)

With a classical unidirectional path tracer, we'll have some scenes where it is difficult to connect to the light source, and therefore many of our computed samples will be wasted. What if we would start not only one light path from the camera, but one also from the light source, and connect the two together? It turns out that we get a much more robust technique that can render a variety of "packed" scenes with lots of occlusions with ease.