Compute winding order of triangles #14
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Closes #13
It's "pretty" fast: I can compute the winding order of 72,500 triangles in 4.5ms.
It turns out that (py)Martini actually does create triangles exclusively in counter-clockwise winding order, but that its origin is in the top-left, as in a PNG. When you use
flip_y=Truefromrescale_positionsin pymartini's utils, all triangles are counter clockwise relative to the standard bottom-left origin.