First let me thank everyone for there response to my question about making
water look as if it is funneling.
Lots of good ideas. Not having ever tried isosurfaces before, I am finding
this very interesting. So on with my question.
  I hope I am explaining this question correctly.
  I remember, way back in my days of algebra and trig, there being a
function 1/x that when plotted on an 'XY' coordinate would give you
something that looked like a funnel. Knowing these functions is there anyway
to use them in an isometric or maybe even a parametric surface. Maybe the
answer is in front of me and my math is just a little rusty, actually a
whole lot rusty
  Once again I thank you for your help and knowledge

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