Given a plane and a 3D point, transform the 3D point to a 2D coordinate along the plane.

haha...

Yes, this is Blitzplus.

I almost have it like this:

u#=nx*z+nz*x+ny*x
v#=nx*z+nz*y+ny*x

...but it is still a little off. I ran into a floating point error that was screwing everything up.

Thanks for the comments. I'll try the way I am doing it now a little more and see if it works. Will report my findings.