Tor Olav Kristensen wrote:
> 
> [...]
> 
> I'm sorry, but I still do not understand what
> you meant by "function based transforms".

Well, i meant to base a transfor on a function.  The syntax would be like:

transform { function { ... } }

and the function would have to be a vector function with three parameters
(just like a transform function).  

transform { function { transform { ... } } }

would therefore be the same as 

transform { ... }

The nice thing would be you could do things like averaging (as
explained).  Of course this is not implemented yet and i am not even sure
if it would work under all circumstances (at least nonlinear
transformations would lead to strange results).

Christoph

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