>but I think that the "tip" at the center is a >divide-by-zero effect in the Math_Function_9

Well, it is not. But I did try a divide by zero on purpose
and Poser did not crash!

The wave-shader represents the following formula:

sin(40 * r) / sqr(r+1)
r (the radius) is the value of Math_Function_5.
It goes from 0 to 1. So, r+1 goes from 1 to 2.
But, as mentioned above, even without that shift
Poser doesn't crash, but renders the above picture.
The hole in the center is really a result of a div by 0.

Ernst