Not exactly sure what you mean about "linear" or "non linear" and how they relate to what i need (want)?... I am using Rhino to screengrab the ZBuffer and then use it as a paint/displacement brush in Modo. The method in Rhino works fine, but the antialiasing doesn't work at same time that ZBuffer is displayed. So i must post-process to enlarge, blur, shrink, etc... I figured it might be possible to have "antialiased zbuffer" grab from Moi. But don't worry if it's too much trouble...

jonah