Bob Hughes wrote:

Nice texturing.


 > Yeah, I know, they only look vaguely like space rocks. Thought I'd 
show how strange they can be if you aren't familiar with them already. 
Maybe I'll be able to make better cratered surfaces without resorting to 
image/bump maps someday but this isn't the day.
 >

An idea for some Q&D craters

#local S = seed(1234);
#local DensityCurve =
spline {
    0/2 <0,0,0>
    1/2 <.5,.15,0>
    2/2 <1,1,0>
};
#local PN =
pigment {
    average
    pigment_map {

       #local I=0;#while(I<256)
           #local ScaleFactor = DensityCurve(rand(S)).y;
           [1
               cylindrical
               scale  .15*ScaleFactor
               #local ScaleFactor =  .5*ScaleFactor;
               poly_wave .8
               pigment_map {
                       [0 rgb   .1]
                       [.1 rgb  10*(1-ScaleFactor)]
                       [.2 rgb -20*(1-ScaleFactor)]
                       [1 rgb  -30*(1-ScaleFactor)]
               }
               rotate <rand(S)*180,rand(S)*180,rand(S)*180>
           ]
       #local I=I+1;#end
    }
};
sphere {
    0, 2
    pigment { rgb .6 }
    normal {
       pigment_pattern {
          average
          pigment_map {
             #local Scl  = 1;
             #local I=0;#while(I<12)
                     [1
                         PN
                         scale Scl
                         rotate <rand(S)*180,rand(S)*180,rand(S)*180>
                     ]
                     #local Scl=Scl*.8;
             #local I=I+1;#end
          }
       }
       bump_size 15
    }
}

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