"Warp" <war### [at] tagpovrayorg> wrote in message
news:3cd7e391@news.povray.org...
> Ben Chambers <bdc### [at] yahoocom> wrote:
> > One thing I noticed the other day... you don't even need to average the
> > normals.  Just add them together, and then normalize the result.  Saves
a
> > few ops.
>
>   Why do you need to normalize the result? POV-Ray eats normal vectors of
> any size (the length of the vector makes no difference).

<g> Usually (ie, in most graphics apps), non-unit-length normals leads to
odd lighting.  But if POV normalizes the results internally, then you don't
even need to worry about that - just sum the vectors.

...Chambers


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