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Vertices sorting

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What do you mean with sorted in ccw order? If the vertices from a polygon are in ccw order seen from one side, then it''s automatically clock wise seen from the other side, so you can''t say of the vertices are clockwise or counterclockwise.
The side of the polygon on which the vertices are ccw (or cw, depending on your settings) is the front side, while if they are in the opposite order, you are seeing the polygon from the back side, and so it won''t be rendered. It''s the task of the modelers to make sure that the vertices are in the right order.
If you just have some vertices, there''s no way to know in which order they should be, because the program doesn''t know the modelers intention.

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