Wlodzimierz ABX Skiba
abx@abx.art.pl
http://www.abx.art.pl/pov/

light_source{-4+9*y 1}

#macro f()
  function{
#end

#macro L(S,A,i,r,C)
  isosurface{
    f()
      min(
        r(x,z,S(y).x)
          #while(C)
            -i(y-C,
               0,
               i(C+.2+A(0,C,0)/2-y,
                 0,
                 A(x*2,y,z*2)/9+.05
               )
            )
            #local C=C-1;
          #end,
        r(x-4*y^.3,z,i(y,0,y/8)),
        r(r(x+5,y-7,3),z,.5)
      )
      -A(y,x,z)/20
    }
    max_gradient 9
    contained_by{ box{ -9 18 } }
    pigment{ agate }
    scale.1
    translate -y+z*2
    finish{
      specular .8
      reflection .5
    }
  }
#end

L(
  f()
    spline{
      quadratic_spline
      0     0
      2,    4
      10,   1
      11,   2
      12,   1
      14.9, 2
      15,1. 9
      15.1, 2
      18,   0
    }
  }
  f()
    pattern{agate}
  }
  f()
    select(x,y,z)
  }
  f()
    (x^2+y^2)^.5-z
  }
  9
)

//KS3

Scene presents ancient teapot and rust on it. All was made as one isosurface. Main body is an iso-lathe made from spline function. Outlet is displaced cone. Holder is a torus. All surfaces was displaced with agate pattern. Body has additional decoration made with another usage of agate pattern. Preview of this render should be available at http://www.abx.art.pl/pov/shortest/KS3.jpg.

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