"jceddy" <jce### [at] gmailcom> wrote:

> Any ideas?
>

I adjusted the crackle function (reversed the colours) then subtracted this from
the cylinder instead of adding it (see below) does the attached look like what
you were after?

Sean

#declare fn_CracklePigment = function {
    pigment {
        crackle
        pigment_map {
          [0.1 color rgb 0]
          [0.2 color rgb 1]
        }
    }
}

#declare fn_Cylinder = function(_x, _y, _z, _rad, _len) {
  max(sqrt(pow(_x,2) + pow(_z,2)) - _rad, f_rounded_box(_x, _y, _z, 0, _rad,
_len/2, _rad))
}

#macro RoundCylinder(inner, outer, length)
  #if(use_iso)
    isosurface {
      function {
        min(
          min(
            f_torus(x, y - (length/2-outer), z, inner-outer, outer),
            fn_Cylinder(x, y, z, inner, length-2*outer)
          ),
          min(
            fn_Cylinder(x, y, z, inner-outer, length),
            f_torus(x, y + (length/2-outer), z, inner-outer, outer)
          )
        ) - fn_CracklePigment(x, y, z).gray/10
      }
      contained_by { box { <-10, -length/2, -10>, <10, length/2, 10> } }
//container shape
      accuracy 0.001                      // accuracy of calculation [0.001]
      max_gradient 4                      // maximum gradient the function
canhave [1.1]

      texture {
        crackle
        texture_map {
          [0.1 pigment { color rgb <1, 0, 0> } finish { ambient 1.0 }]
          [0.2 pigment { color rgb <0, 0, 0> } ]
        }
      }
    }
  #else
    union {
      torus { inner-outer, outer translate <0, length/2-outer, 0> }
      cylinder { <0, -length/2+outer, 0>, <0, length/2-outer, 0>, inner }
      cylinder { <0, -length/2, 0>, <0, length/2, 0>, inner-outer }
      torus { inner-outer, outer translate <0, -(length/2)+outer, 0> }

      texture {
        crackle
        texture_map {
          [0.1 pigment { color rgb <1, 0, 0> } finish { ambient 1.0 }]
          [0.2 pigment { color rgb <0, 1, 0> } finish { ambient 1 }]
        }
      }
    }
  #end
#end

object { RoundCylinder(3, 0.2, 5) }

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