POV-Ray : Newsgroups : povray.general : Calculating the normals of a triangle : Re: Calculating the normals of a triangle Server Time
5 Aug 2024 12:20:49 EDT (-0400)
  Re: Calculating the normals of a triangle  
From: Marcus Fritzsch
Date: 11 Sep 2002 10:24:43
Message: <3D7F51EA.3080804@fritschy.de>
Hi again...

Warp schrieb:
> ...
>   (The normal vector of a triangle can be calculated with the cross-product
> of two of its edges. According to empirical tests, *not* normalizing these
> normals gives the best result in the sum described above (because the
> dot-product of the two edges of a triangle gives a normal vector which
> length is equal to the area of the triangle, and not normalizing this
> vector means that a larger triangle has more effect in the normal of the
> vertex than other smaller triangles sharing that same vertex, which
> reportedly gives better results).)
I have some problems with this part, first you told me about 
cross-product of
the edges, than, 2 lines below of the dot-product of the 2 edges... 
which one
is right? my maths aren't enough to understand this before have it used 
it and
seen the result...

greetings, Marcus


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