global_settings { hf_gray_16 }
   
   #declare Debug=true;
   /* Debug short messages */ 
   
   #declare Hollow=false;
   /* if true all level2 sponge in the final sponge will be hollow. */
   
   #declare Write_X_Wall_Only=false;
   /* only the wall parallel to x-axis will be written */
   
   #declare DP=3;
   /* number of decimal points */
   
   #declare INC=false;
   /* output a POV inc-file
      only triangles are written 
      the filehandle is "INC_FILE" */ 
   
   #declare PRINT_COMMAS=false;
   /* write commas between vectors in inc-file:
      true:  triangle {<v1>,<v2>,<v3>}
      false: triangle {<v1><v2><v3>}  
      this is to reduce the file size    */
   
   #declare RAW=true;
   /* output a raw_file 
      the filehandle is "RAW_FILE" */
      
   #declare RAW_COMMENTS=false;
   /* split the raw-file in objects
      the objects will be named according to their x,(y,)z coords */
      
   
   #if (RAW)
      #fopen RAW_FILE "m:\SPONGE3.RAW" write 
   #end
   
   #if (INC)   
      #fopen INC_FILE "m:\SPONGE3.INC" write 
   #end
   
   #include "spng_out.inc"
   //SPONGE2(0,0,0,9)
   SPONGE3(0,0,0,9)
   //SPONGE4() //NOTE: The size of SPONGE4.RAW is ~20 MB!
      
   #if (INC)
      #fclose INC_FILE
   #end
   #if (RAW)
      #fclose RAW_FILE
   #end
   
   #declare txt_str = concat(str(tc,1,0)," triangles.")
   #declare len=strlen(txt_str);
   text { ttf "crystal.ttf",txt_str, 0.1, 0 
   pigment {rgb 0} scale <1,1.5,1>
   }
   
   background { rgb 1 } 
   camera { location <len*0.25,0.2,-len*0.5> direction z }
   light_source {-z*100 rgb 1.2 shadowless}