I'd like to convert the 16 control-points of a (bicubic) bezier patch into a 
hermite patch and vice versa.
I know how to do it for curves, but with patches I don't know how the 4 inner 
bezier-controlpoints can be converted into the "twist vectors" of the hermite 
form (and vice versa).
What do the twist vectors actually represent?
Do you know an equation, or a link to some paper describing this issue?

Thanks for your help!

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