Originally Posted by
Steve_Bennett
It could have to do with a number of things. For one, what platform is the dwg file coming from - Revit or AutoCAD? It might be the material assigned to the objects in the dwg file is overwriting what you've setup. Secondly, I know that if you wanted to run with all mental ray settings in VIZ, there is a custom UI that can be set to run. There might be a similar setting with vray, although I don't have it on my system to check. Look under the Preferences pull down-> Custom UI & default Switcher as that is where a vray UI theme would reside. Also, in the import/link options advanced settings be sure to check the 2 boxes: "Use Scene Material Definitions" and "Use Scene Material Assignments on Reload" to avoid having materials you've assigned to objects from being lost.