Mael wrote:
> 
> can you explain why it's not a good idea ? (so i can change it :)
> does the slope pattern not use the modified normal ?
> 

The slope pattern uses the unperturbated normal.  

In your aoi pattern, the syntax with normal is something like:

texture {
  pigment { aoi pt_cam } 
  normal { ripples .6 }
}

Which means it uses the normal statement to influence the pattern value. 
This is against the general concept IMO.  

For example what should happen with:

  normal { aoi pt_cam 0.5 }


The advantage of your pattern is quite clear (apart from the different
handling of normals it seems identical with the slope pattern) but it
would be better IMO to make the use of warps possible in such patterns by
making them influence the normal vector. 

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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