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Given an arbitrary set of four points, for which the only known criteria is the screen-space coordinates and that they'll form a convex polygon (or line or point), there are several things that I need to be able to determine. [2/?]
A) Determine the shape's order (point, line, triangle, quad). B) Order the verts in a way such as to form horizontal spans that can be walked up or down. C) Calculate edge deltas such that horizontal spans can be filled during said walk. Any ideas, folks?
These are pretty straightforward, though doing it quickly is another story... :)
The first step would be to sort the points by Y coordinate.
why do I feel like this is a Sega Saturn?
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