Thanks, Thomas, you give me a good idea about reducing manual work, 
analysis of groups and regrouping can help to do it.

May be I will write script to assign different materials to groups
and then merge them. I need to know more about OBJ format for that.

But autocolorizing still interesting to me. For example, what if I want 
to highlight edges or peaks of the complex mesh with selected color ?
Will try to dig into this problem ...
--
YB

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