In article <3a60edd6@news.povray.org>, "Rune" <run### [at] inamecom> 
wrote:

> Nope, I've already tried that, and it doesn't work. Imagine a box 
> deformed by a shearing matrix. The normals on the skewed sides should 
> change, but they won't using your method. I think I need several 
> points for reference (two points forming vectors perpendicular to the 
> normal vector?), but I haven't had any luck so far.

Right, this only approximates, and only "works" for some 
distortions...are you only using matrix transformations? Or were you 
only using shearing matrices as an example?
I'll be thinking about this problem for a while...

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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