FTopologicalLoop::Orient

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Description

To check loop orientation, we check the orientation of the extremity points i.e. "o" points below o / \ / \ o o \ / \ / o

For these points, the slop is compute. If the slop is between 0 and 4, the loop at the point is well oriented otherwise not

The difficulties start when the slop is closed to 0 or 4 i.e. -----o-----

In this case, the orientation of the next segment is compare to the bounding box

The last very difficult case is a sharp case i.e. The slop is closed to 0 or 8, so it could be a pick in self intersecting. We try to recompute the slop a the closed point

If the slop is still closed to 0 or 8, the point is "UndefinedOrientation" This case was found in the shape of char '1'

bool Orient()  
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bool Orient()

false if the orientation is doubtful