[Algorithms] Re: Some questions about N-Patches...

[Peter W. <pet...@ho...>]

This is just a correction for my last message on N-Patches. I just realised 
that the normal interpolation formula I gave was wrong. I used the formula 
NewNormal=Cos(45)*Normal0+Sin(45)*Normal1. This only works when the normals 
are perpendicular to each other (as in the case of my first test mesh).

I'll have to look at spherical interpolation for normals more closely, I 
have the feeling that I can take the cross-product of the two normals, use 
that as the axis of rotation to rotate around. I'm sure there are simpler 
approximations out there as well. Linearly interpolating between the two 
normals, eg NewNormal=0.5*Normal0+0.5*Normal1, and then renormalising to get 
back to unit length sounds good too.

Peter Warden
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