This is just an UN-TRIED idea. Set attributes of all three objects to intersection (and apply texture of negative object to off just to be safe) and create a cube that encompasses entire model. Place it so that model is inside and as close to centered as possiable. Set cube attributes to intersection and texture. Render. If this works you may have to play with texture mapping to get right. Let me know if it works! Believe me it might not! Thunderdon. Oh, select each part of object and click on the terrain editor icon to activate the smmothing options panel for all three objects first. Make sure "solid while boolean rendering" is on for all three. Smooth while at it.