> while in rendering it is all about surface effects. I would have agreed with you back in the 80's. But since then, taking care of atmospheric / volumetric e

> while in rendering it is all about surface effects. I would have agreed with you back in the 80's. But since then, taking care of atmospheric / volumetric effects in rendering is absolutely essential to rendering realistic scenes, especially in movie SFX. I'm not going to claim that SFX folks care about being physically accurate when doing volume rendering, but they do care a very great deal about clouds fog, subsurface rendering, light rays through mist, etc ...