If you’re new to 3D modeling like me, you probably clueless how to remove all of the assigned Scene Material from an object in Material Editor. Doing this is a little bit easy and needs some small codes.
First in your 3D view, select all of your object then on the bottom left of the screen there is some input text box called max script mini listener where you can write script – in the screenshot above its the pinkish box besides 6 Objects Selected. Then, Type the following codes:
$.mat = null
then hit Enter, once done all material will be unassigned and gone from Scene Materials.
Hope this help you doing your 3D models!