New answers tagged cad
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Easiest is probably OBJ or PLY. But can not really dump material info like you want. But you could encode it in a per face value. Both formats use similar windup rules to yours.
Step (.STP) is out of question. Its a a few orders of magnitude more complex than what you have and does not deal with polygons, but rather a BREP model.*
Ascii STL might work. But ...
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