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Takes 4 vectors (one for the test point and 3 for the triangle)
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This is a 2d function so only X and Y are used, Z and W will be ignored.
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@return: 1 for a clockwise intersection, -1 for counter clockwise intersection, 0 when there is no intersection.
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def PointInQuad2D(pt, quad_pt1, quad_pt2, quad_pt3):
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@return: 1 for a clockwise intersection, -1 for counter clockwise intersection, 0 when there is no intersection.