Sebastian H. wrote:
>>
>> Note the current f_rounded_box() is not a very efficient solution 
>> anyway (you don't need an sqrt() for every evaluation).
> 
> Actually I tried the following expression.
> 
> return (PARAM_X * PARAM_X
>  + PARAM_Y * PARAM_Y
>  + PARAM_Z * PARAM_Z
>  - PARAM(0)*PARAM(0));
> 

That's not what i meant.  You don't need the sqrt() on the faces of the 
rounded cube - there a simple plane function is sufficient.

Christoph

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