"Sigmund Kyrre Aas" <as### [at] studntnuno> wrote...

> #declare S=.4;  // setting this to less than .5 gives strange results
> #declare L=.5;  // setting this to 0 still produces artifacts

>     function { L*sqrt(cos(x/S)) + y^2+z^2 }

>     contained_by{box{-<.8,1,1>,<.8,1,1>}}

Please note that "cos(0.64 / 0.4)" is less than one.  This occurs well
within your contained_by box, which ranges from x=-0.8 to x=0.8.

Taking the square root of a negative number is not defined in real number
space.  This is the source of your problem.

-Nathan

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