In article <web.3f902f48984cd6c4462c6a70@news.povray.org>,
 "FlyerX" <fly### [at] yahoocom> wrote:

> That is what I suspected. By disturbing the normals slightly it worked.
> I wonder why does POV-Ray behave like that.

If the normals are all the same, no interpolation needs to be done. 
Simply using a normal value is faster than interpolating between three, 
so interpolation is turned off. Whoever wrote the code just never 
anticipated that anyone would want a non-interpolated normal that is not 
in the direction of the actual triangle normal. It does seem a very 
strange thing to do.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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