Hi Ron,
    I _really_ like the idea of using the function/pigment names as the calling
function name. In my blinkered thinking I simply hadn't considered it a possibility.
I haven't looked at express.c in quite a while, v3.1 not at all, so I wouldn't like
to comment on feasability. But as you say, it should be possible - I can't think
pigment/isosurface type tokens occur in an expression for any other reason.

    If you have the time, I think this would make a nice little extension to the
syntax. I may well try coding it up myself just for fun ...

    All the best,
        Mike Andrews.

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