Skip Talbot wrote:
...
> Warp, I also tried your function and couldn't get it to show up.  After 
> getting a nice result with Alain's function I'm not going to dig too 
> deeply into the math trying to get that function to work, but thanks.

Try this:

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

#version 3.6;

#include "colors.inc"

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

isosurface {
   function { y - exp(-(x*x + y*y + z*z)) }
//  function { y + exp(-(x*x + y*y + z*z)) }
//  function { y - exp(-(x*x + z*z)) }
//  function { y + exp(-(x*x + z*z)) }
//  function { y - exp(-z*z) }
//  function { y + exp(-z*z) }
   contained_by { box { -<100, 1.1, 100>, <100, 1.1, 100> } }
   pigment { color White }
}

light_source {
   <1, 3, 2>*100
   colour White
   shadowless
}

camera {
   location <4, 3, -1>
   look_at <0, 0, 0>
}

// ===== 1 ======= 2 ======= 3 ======= 4 ======= 5 ======= 6 ======= 7

-- 
Tor Olav
http://subcube.com

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