"Warp" <war### [at] tagpovrayorg> wrote in message
news:3cd536d5@news.povray.org...
>   AFAIK the best result is got if you *don't* normalize the normal vectors
> after the cross-product, but use them as they are. (The length of the
vector
> produced by the cross-product is the area of the triangle and this gives
it
> a good weight in the average.)

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.

...Chambers


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