Any scene material (from the Material palette) in AutoCAD can be assigned not only to the whole object, but alternatively also to a specific face on the 3D object.
In older AutoCAD versions (2009 and older), right-click on the selected material in the Materials palette and use the "Apply material" function. On the object then select the specific 3D face with the Ctrl key.
In newer versions of AutoCAD (2010 and higher) with the new unified material editor, first choose the requested faces on the 3D object (as sub-objects, i.e. with the Ctrl key) and in the material palette click on the image of the requested rendering material.
You can also use the SOLIDEDIT command with the option Face and Material -- identify the face by its edges and enter the name of the requested material.
Another option is the command MATERIALASSIGN; on the "Select objects:" prompt enter Subobject and select the requested face or faces.
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Please use these tips at your own risk. CAD Studio (Xanadu) is not responsible for possible problems that may occur as a result of using any of these tips.
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