clipka wrote:

> Internally, the indirect illumination intensity is referred to as "ambient";
> maybe this led to some mixup of variables, causing this indirect illumination
> intensity to be mistakenly used as ambient term for additional texture layers -
> or something along these lines. Or it is just summed up for layered textures,
> instead of being weighted properly.
> 

Just to make it clear. The layered textures did not cause this problem, 
(maybe they cause artifacts if the max_trace_level is not high enough, 
but this is another story). It is just the patterned texture statement.

texture {
   checker // or anything else
   texture {T1}, texture {T2}
  ...
}

And as mentioned in my other post, something strange does happen with 
texture maps even when no radiosity is involved.

-Ive

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