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What is orientation and why do we need it.
When we want to drop an object\group on the ground (another surface) we need to know
what surface of the object\group should be glued to the ground.
The computer of course doesnt know on his own that a piano should stand on its legs ...
With this flag the designer of the model can express his will that the piano should stand on its legs ...
In order to fully define the orientation of a group, one polygon of the group should have ORIENTATION_BOTTOM or ORIENTATION_top
and a second polygon should have ORIENTATION_FRONT or ORIENTATION_BACK beside those two polygons all the rest
should have ORIENTATION_UNKNOWN. Nothing bad happens if they dont, it is just that it can cause contradict.
See also STATE_group_set_orientation()
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