After many hours of tweaking around in the material browser, I have finally figured out how to simulate christmas ornaments using the mental ray engine.Using a standard materail, I set up the diffuse to black RGB(0,0,0). Specular Level:80, Glossiness: 40. Use a fresnel falloff map in the reflection with an intensity between 50 and 65. The falloff mix curve should be set up as shown below.
The second color on the falloff is set as "raytrace" map with your favorite HDR image as the background map. The first color of the falloff will be a "mix" map.
The first mix map color will be another raytrace map with the environment settings as the background map. the second mix map color should be set to whatever color you want the Christmas ornament to look like... except you'll want to drop each RGB channel by about 10 to 15.
The mix level should be set whichever way looks best. The ball on the left is set to 15. The red ball is set at 40 and the green ball is set at 50.
Setup the mental ray for final gather (set to around 40 or 50). Also, I use the Lanczos filter with pixel sampling setup at 4 min. and 16 max.
There you go. Rendering time will take a long time. You can kill the fresnel level raytrace for faster rendering times but you will lose quality. Add it to your favorite ornament model and you're done.
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