I stand corrected. I didn't now that BUM's were actually normal perturbing maps. Good to know. Still, normal mapping in the Firefly engine can still bring out MUCH better results than displacement mapping (must try them in combination now). Why? Because of the 8 bit's per channel limitation in the image loaded. This limits the "smoothness" of the displacement that can be applied (and in general makes the displacement look pretty crap at high levels). Yes, I know there is a workaround - but it only applies for those of us that actually own Photoshop. I use GIMP, it works for everything else BUT the hack used to convert 16bit displacement maps into an RGB image for multi-channel displacements.