Custom Map Makers

This seems to explain it fairly well. Is there anything else I should know?
http://en.wikipedia.org/wiki/Non-uniform_rational_B-spline

a patch meshe is a Bézier surface i think

i think this is just about the surface: http://en.wikipedia.org/wiki/B%C3%A9zier_surface

this is about curves: http://en.wikipedia.org/wiki/B%C3%A9zier_curve

ill see if i can find better links