I can 'reset editor material slots' but I would like to delete all material from scene that my object in the scene will be clear with default material?
Yeah, but script is easier/faster. Select all the meshes, go to the Utility panel, click the More... button, choose UVW Remove and click OK, then click Materials.
All the methods listed are good. One more you may want to try, depending on what you're trying to accomplish, is using the material override setting in the processing tab of the mental ray renderer. This will apply one material to every object in the scene for the purposes of rendering.
Open the Material Editor. Chose a blank material node and assign it to everything. In the Material Editor window, choose Utilities > Condense Material Slots. Press Shift +T Select any of the referenced or old Textures, Right Click and choose "Strip Path". Save your file. Your materials should all be reset to default and…
It was a two lines script, but if you like: for theItem in Geometry do ( theItem.material = undefined ) EDIT: If you want it as a command you can associate to a shortcut or a toolbar button, evaluate following code, then go to Customize user interface and find it under Category "Material Tools". macroScript…