I hope I am not stepping on anyones toes by starting this thread but as a old 3dsmax user I have found that the Mental Ray Shader Discussion thread (in the 3dsmax section) to be the most helpful bit of information on this forum. I was hoping now with the price cuts and user base growing in the XSI community we could start a Mental Ray thread for XSI. Since XSI has a more complex shading tree it would be really nice to share information on rendertrees, presets and techniques.
For reference I have been using Jeff Pattons great Mental Ray resource page to see if I could achieve some of the same effects without the lume shaders. http://www.jeffpatton.net/Max6/index.html
One of my biggest problems is getting good results from the XSI glow post effect. Here is an example of trying to achieve glows without lume glow.
[img]http://www.planetquake.com/kabalarena/images/XSI_MR_glowtest.jpg[/img] [Scene File](http://www.planetquake.com/kabalarena/images/MR_spheres_glow.rar)
Feel free to post your experiments and techniques dealing with Mental Ray in XSI. Post scene files, presets, and screen captures of your rendertrees to help with the discussion.
3dsmax Mental Ray Discussion - [http://www.cgtalk.com/showthread.php?t=104578](http://showthread.php?t=104578)