So the point you have to decide with which renderer you want to render, has to be before Texturing...best joice would be: Before you start, because the RAT have several different modelling tools like SUBD's (the ORIGINAL), or blobs. If you want to use already finished MAYA-Scenes, you have to re-create the Shading-Networks, adjust all lights new, with Renderman-Shaders and MapGenerators aso. or you use MAYAMAN. SLIM has some very great, and impressive procedural shaders. And Networks are easily created. You have a Skin-Shader, Velvet, Plastic, Thin Plastic...whatever your heart wants, everything except real raytrace...this is one thing you have to fake in Renderman with Reflection MAPS, or Refraction MAPS...but the renderer is shurely THE choice. If you are working with Displacement-Maps it's the best available. And the DOF and MotionsBlur are the fastest available, because of the subpixel-displacement-technology (uses only 10-20% more rendertime for the best MotionBlur). Network-Rendering is also great (also with MAYAMAN, there you can split an image into several pieces, MAYAMAN generates a .bat-File u have to start on each computer, and every CPU generates a bucket. Then you have another .bat file, to put the several Pieces of the Image back to one Image)...