While playing with Isosurface functions in media, I found that I want the
"threshold" keyword inside my density but I have not found a way to do it.

I tried various ways of including it into a declared texture and placing it
in several places in the density itself. I suspect that I will have to build
it into the function where all values descend to zero and stay there, which
means no sine/cosign type things...8-(

The thing I am trying to do right now is toroidal media using "torus"<...>
which gives me a torus, but then also shows the points of a torus which
surrounds that torus.... not fun.

Any Ideas?

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