In article <3b8b4d1a@news.povray.org>, Mar### [at] t-onlinede 
says...

> Just an idea: are you sure, that your contained_by-object does not cut of
> the roughness at the bottom?
Definitely not. I think it has something to do with the derivative of the 
function beeing much higher in y direction.

> If that's not the case, you could add the pigment directly to the
> y-component (like in +((y+platenorm(x,y,z)*0.1)*rb)^b) of the formula, too.

Thanks, this might work...will try it.

Lutz

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