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“In this video, from “Production Instruction with 3ds Max 2010: Volume I”, we’ll take advantage of mental ray’s ProMaterials to create a nice clay render of the interior scene we’ve been working on. By rendering using the technique shown in this video, we can create a clean and clear render that showcases our work in the best light possible, highlighting the depth and details of our modeling work.”
http://www.cgarena.com/freestuff/tutorials/max/i3d/clay_render.html