Use a more robust triangle test #2037
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fix #2035
A curious consequence of this change on the penguins-barycentric image: since a few pixels have become valid, the sequence of pseudo-random numbers that determines the color of each pixel in the mix is called on less elements, which shifts the pattern of pixels to the right. I triple-checked that this is not a bug: the densities (viewed by blurring) are correct.
shift.mp4
cc: @jheer