> #declare Freq=20;
>
> isosurface {
>     function {
>          y-sin(x*Freq)/25
>     }
>     contained_by {
>      box {<-1.5,-1,-8>,<1.5,1,8>} // could change x and z (W and L)
>     }
>     max_gradient 2 // adjust
>     open // make surface only
>     pigment {rgb 1}
>     scale 1
> }

Cheers, I'll be sure to give you cred in my IRTC entry, but if I forget,
here it is.

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