More bump issues... Env made very nice examples, but all of it quite nasty to solve. Three improvements I found nevertheless: - bug in mipmap code for bump gave errors in one derivate, causing aliasing - when Image texture option "Clip" was used, the imagetexture function returned wrong value, causing the caller to create own normal based on color (zero!). - Mipmapped bump now also interpolates the samples (never did this...)