> > #declare transTex = texture {
> >   pigment_pattern {function{abs(sin(x*4)+cos(y*8))*0.5}}
> >   texture_map {
> >      [0 pigment {rgbt <0,0,0,1>}]
> >      [1 pigment {MyPigment}]
> >   }
> > }

Another approach which preserves "sine wave" appearance as opposed to
"scallop wave" is this:

pigment_pattern {function{(sin(x*4)+cos(y*8)+2)*0.25}}

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