> but in ray marching you don't cast secondary or tertiary (or more rays) like you do in ray tracing (thus limiting the processing, but also the level of reali

> but in ray marching you don't cast secondary or tertiary (or more rays) like you do in ray tracing (thus limiting the processing, but also the level of realism) Not necessarily. The marching is used to sample a volume to find intersections (or density), so you can absolutely march secondary rays for shadows, reflections etc. http://9bitscience.blogspot.se/2013/07/raymarching-distance-fields_14.html http://9bitscience.blogspot.se/2013/07/raymarching-distance-...