Have you tried Autodesk Showcase? If you haven't, you should. You can send a Revit camera shot right to Showcase and have instant photorealistic rendering, as well as quickly change material colors. It seems much better than waiting to render inside of Revit and 3ds Max is way too complicated to use if you're a novice.
Anyway, there's a free Showcase viewer.
Preparing scenes for use in Autodesk Showcase Viewer
In a licensed version of Autodesk Showcase, scenes must be saved using File > Save Scene and Textures as… to create a files compatible with the standalone viewer. (Standard Showcase scenes may open in Autodesk Showcase Viewer, but materials, textures and environments will not appear.)
Running Autodesk Showcase Viewer
If you experience problems starting the Autodesk Showcase Viewer:
Check that you have the following software installed. (This can be confirmed in Windows Control Panel > Add/Remove Programs. Most Windows systems will already have this software installed.)
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