I initially wanted to use bilinear interpolation, but we're not dealing with colors on a canvas. We're dealing with pointers to pixels on the cubemap. That's why we have a lens map, so we can create…
From the README.txt of Qhull:
Qhull computes convex hulls, Delaunay triangulations, Voronoi diagrams,
furthest-site Voronoi diagrams, and halfspace intersections about a point.
It runs in 2-d, 3-d,…