I'm working on some deformation macros that deforms the point vectors and
the normal vectors in a mesh.

Deforming the points is easy. Deforming the normals is a bit more
complicated.
To find a deformed normal I try to find the deformed points very close to
the start point of the normal, and see how the direction changes. However, I
can't figure out quite how to do it.

Say the macro Deform(V) will return a deformed version of V.
If I have the point P I can find the deformed point dP:
#declare dP = Deform(P)

If I have the normal N, how can I find the deformed normal dN?

Rune
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