Alain Martel <kua### [at] videotronca> wrote:

> As if() can't be used in the function of an isosurface, select() is
> pretty much the only option.

Well, I don't think that's entirely true.

If you take advantage of the fact that expressions inside of parentheses get
evaluated, and make use of functions like sgn, min, max, etc, then you can
multiply terms in an equation by values that select them (multiply by 1 or -1)
or cancel them out (multiply by 0).

So if you wanted to alternate signs, you could use a sine wave and take the sign
of that:  sgn(sin(N))

- BW

Post a reply to this message