One of my personal attractions to RmF is its subpixel tesselation of subdivision and NURBS surfaces. It renders both out extremely quickly, and there are never any jagged or sharp facets.I have had mixed results with the tesselation of these surfaces with Mental Ray, both in terms of quality and time, but I was very pleased with the renders I received from my bathroom model. After rendering out my first beauty pass of the night scene with RmF, it was quickly evident that I needed to use MR to create certain passes, such as ambient occlusion and possibly light fog. When I rendered out my ambient occlusion with MR, I was lucky that it actually only took about a minute to render, and matched up perfectly with my RfM beauty pass - even at 1920x1080 resolution.
I'm currently running Maya 2008 and know that MR has had good improvements in quality and efficiency since even Maya 8.5. I guess the reason for this post is that I just want to confirm it is indeed possible to seamlessly composite passes from both RmF and MR, without adjusting parameters for either renderer.
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