Oops!  Left out a closing bracket after the functions...

#3--the plate shape with a crater added!
 isosurface{
  function{y - my_pigment_function_1 (x,y,z).gray * .4}
max_gradient 2.8
 contained_by{box{<-1,0,-1>, <1,.3,1>}}
 texture{...whatever..}
                 }

and here too...

 #4--the crater with a crackle pattern function overlaid (this uses three
 functions)...

 isosurface{
  function{y
   - my_pigment_function_1 (x,y,z).gray * .4 // crater
   + my_pigment_function_3 (x,y,z).gray * .02 // crackle
                }
 max_gradient 3.2
 contained_by{box{<-1,0,-1>, <1,.3,1>}}
 texture{...whatever..}
                 }

Ken

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