Chris Huff wrote:

> I'd just use an isosurface...but you might get what you want by using a
> while loop to generate a line of spherical components decreasing down to
> nearly 0 radius.

Or a good old quartic... "Piriform" does nice teardrop shapes, as does this
even simpler bit of code from Ken Tyler.

G.

  #include "colors.inc"
  camera{location -3*z look_at 0}
  background{rgb .5}
  light_source {<1,.4,-1>*1000 color White}
  light_source {<-1,1,-1>*500 color White*0.3}

  #declare Drop =
  quartic{<0,0,0,0,0,0,0,0,0,-4,0,0,0,0,0,0,0,0,0,0,
           0,0,0,0,0,-4,0,0,0,0,-1,2,0,-2,1> sturm}

    object { Drop rotate x*-90
   texture {
   pigment { rgbf<0.9,0.9,0.9,0.7>}
    finish { ambient 0.3 diffuse 0.3 specular 1 roughness 0.001 reflection
0.2}
           }
  interior { ior 1.15 }
           }


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