Another "quick" isosurface doodle --an abstract shape with a
psuedo-weathered appearance.  Thought the equations used might be of some
interest, so I am posting the code for this object below:

#declare spring=+3.00;
#declare major=+0.75;
#declare minor=+0.20;

#declare a = function{sqrt(x^2+z^2)-spring}
#declare b = function{atan2(z,x)*13}
#declare c = function{(sqrt(y^2+a^2)-major)}
#declare d = function{cos(b+atan2(y,a))+1}
#declare e = function{sqrt(c^2+d^2)-minor}

#declare pgmnt =
function
{
 pigment
  {
   granite  color_map  { [0 color rgb 0] [1 color rgb 1] }
   scale .333
   warp{toroidal orientation <0,1,0> dist_exp 0 major_radius spring }
  }
}

isosurface
{
 function {e-.07*pgmnt}
 contained_by{sphere {0,4.0}}
 eval
 method 2
 max_gradient 7
 threshold 0
 pigment{color rgb 1}
 finish{ambient .32}
}

Isosurfaces rule!

Quadhall

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