"Jaap" <jws### [at] yahoocom> wrote:
> yes it's fine (i think), as long as the normals you add
> are normalized! (otherwise long normals contribute more
> to the average than shorter normals)
> imagine stacking all normals on top of each other (in 3D),
> you end up with a funy line that can end anywhere, so the
> result will not be normalized by dividing it by the number
> of normals you added together.
> the end of the stack of normals may end op at <0,0,0>, witch
> can't be normalized, because it does not have any direction.
> (like when you average to normals with exactly opposite direction)
you can skip the the divide by n, if you are going to normalize
the resulting vector anyway.
(but your problem may be caused by something else)
jaap. (again)

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