// fractal pattern typ Julia 
/*
JULIA:
  julia COMPLEX, ITERATIONS [, BUMP_SIZE]
  [exponent EXPONENT]
  [exterior EXTERIOR_TYPE, FACTOR]
  [interior INTERIOR_TYPE, FACTOR]
 
 COMPLEX is a 2D vector denoting a complex number, i.e. <0.360, 0.250>.
 ITERATIONS = number of times to iterate (up to 2^32-1) the algorithm.
 EXPONENT is an integer between 2 and 33. Default = 2.
 interior and exterior specify special coloring algorithms.
   We can specify one of them or both at the same time. 
   They only work with the fractal patterns. 
 EXTERIOR_TYPE and INTERIOR_TYPE are integer values between 0 and 6 (inclusive). 
   When not specified. Defaults: INTERIOR_TYPE = 0 and EXTERIOR_TYPE = 1. 
 FACTOR is a float. The return value of the pattern is multiplied by FACTOR before returning it. 
 It can be used to scale the value range of the pattern when using interior and exterior coloring 
 (often needed to get the desired effect). Default FACTOR = 1.
*/ 
//--------------------------------------------------------------------------
#declare Pigment_1 = 
        pigment{ julia <0.150, 0.160>, 20
                 interior 1, 1 
                 // exterior 2,1 
                 scale 0.70
                 color_map{
                    [0.0 color rgb <0,0,0>]
                    [0.2 color rgb <1,0,0>]
                    [0.4 color rgb <1,1,0>]
                    [0.5 color rgb <0.5,1,0>]
                    [0.7 color rgb <0.5,0,1>]
                    [0.9 color rgb <0,1,1>]
                    [1.0 color rgb <0,0,0>]
                  } // end color_map
               } // end of pigment

sphere{ <0,0,0>, 1 
        pigment{ Pigment_1  }    
        normal { pigment_pattern { Pigment_1 }  
                  3 // BUMP_SIZE
               } // end normal 
        finish { phong 1 } 
         
        scale<1,1,1>  rotate<0,0,0>  translate<0,0,0>
      } // end of sphere ----------------------------
//--------------------------------------------------------------------------
//--------------------------------------------------------------------------