Interesting comparison. Blender uses full on path tracing so it does in fact simulate the optical paths, however. What POVray does I'm not sure, but it seems li

Interesting comparison. Blender uses full on path tracing so it does in fact simulate the optical paths, however. What POVray does I'm not sure, but it seems like it uses a more direct calculation rather than monte carlo sampling like blender. I did like fig 6 better than fig 5, the latter seemed overbright. It also looks like the refractive indices were not the same for the two images.