So, I managed to get the first step of the wholly SDL-based uv mapping worked
out.
Had to get my head back into "function space" and "pigment space" first, and
then things proceeded with only a few hiccups.
Shown is the image map on a unit square, followed by a unit sphere uv-mapped
with a function pigment, rotated around y by 0, 90, 180, and 270 degrees.
Maybe tomorrow I can make some more progress toward non-spherical parametric
objects and see how that goes.
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