Here is the code for the screw-shaped object. The example image is at
the images section of this newsgroup.

Hey, look! I indented my code! ;) Beware of any line-wrapping that may
occur if you paste this cose into your pov scene.

Samuel Benge


//This Code Requires That You Use Superpatch Version 3.1e

//This pigment will warp the isosurface object. The triangle_wave gives
us the sharp, saw-toothed surface.
#declare P1=function{pigment{spiral1 12 rotate x*90 scale y*.25
triangle_wave color_map{[0 rgb<1 0 0>][1 rgb<0 1 0>]}}}

isosurface{
 function{
  (P1(x,y,z)*.1)    //This is how you initialize the pigment within the
function. The *.1 is how strong the pigment will affect the isosurface.
  +(x^2+z^2+.5)    //This is a basic cylinder along the y-axis. The +.5
shrinks it slightly.
 }
 threshold 1
 sign 1
 accuracy .015  //I found this value optimal for working with isosurface
pigment functions.
 method 2
 max_gradient 5
 pigment{rgb .3}
 finish{specular 1 reflection .6}
 hollow
}

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