First things first - WHY are you doing this to yourself? Revit works SO much better with native geometry, rather than imported geometry. It is SO much more effort than it's worth!
In your MAX model - make sure that objects are named and on separate layers. I like to create layers for different materials. Or you can have a gazillion layers for each object - whatever floats your boat. Make sure that the layers have really really outlandish colors! An additional touch - for complex curved geometry which may come in triangulated into Revit, I select edges and make them invisible. Then export your MAX model to AutoCAD 2007 (nothing else - for some reason this is the only one that works!) DXF and then into Revit.
In Revit - go into Manage>>Object Styles. You will see your layers in Imported Objects. With your model in Shaded view, open the material library and start deleting materials from the materials library. Delete and Apply. There will be a time when the outlandish color of the geometry WILL change to a grey - that is when you undo the delete. That is the material associated with the geometry - rename it so that it makes sense to you. And no, you cannot select a material and add it to the layer in Object Styles. It just doesn't work that way.
A word - now that you have associated the specific material to the geometry, don't be surprised if it looks 'off' Save yourself some grief and just tweak the material in Revit. Or better still, create the entire geometry in Revit. Take it from someone who learned this the hard way!
Rina Sahay
Autodesk Expert Elite
Revit Architecture Certified Professional
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