[Andreas Gerdes <ger### [at] netcolognede>]
| Does that mean, that I simply have to add these normals and divide them by
| their number?

Yes, but make sure your normals are of the same length and that they 
are pointing in the same direction relative to the surface. (Clockwise
vs. counterclockwise triangles)

-- 
A penny for your thoughts.
Mine are more expensive.

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