Rune wrote:
> 
> [...]
> 
> * Transforming the corresponding normals correctly is very difficult if
> possible at all.
> 
> [...]
> 
> * vtransform don't give access to the different parts of the transformation
> (which I named X, Y, Z and P), and thus the correct weighted average cannot
> easily be performed. If you insist that it can be done, please provide a
> macro that takes a weighted average of any number of transforms.
> 

I don't see a reason why it's more difficult to do this in Pov SDL than in
c code.   Implementing your idea directly in Povray does require the same
calculations.

I do not say a function like you suggested is nonsense, but before writing
a patch for that it would be useful to try it in Pov SDL and see how it
works.  

Concerning transforms: a method for weighting several of them could surely
be useful in many cases, something like:

transform {
  average { 
    MyTrans1 weight 0.3 
    MyTrans2 weight 0.5 
  }
}

(although i'm not really content with the syntax)

Christoph

-- 
Christoph Hormann <chr### [at] gmxde>
IsoWood include, radiosity tutorial, TransSkin and other 
things on: http://www.schunter.etc.tu-bs.de/~chris/

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