It is a way of applying a texture to an object in such a way that points
on the texture will be mapped onto the object at similar parametric
coordinates. For example, let's say the bottom left is (u,v) = (0,0) and
top right is (u,v) = (1,1), and we map that over a bicubic_patch, the
(u,v) of the texture will follow the (u,v) of the patch, and be deformed
with it.

See p.b.i for example image :-)

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