Wasn't it Larp who wrote:
>Anyway, I changed the structure to single blob version and
>got render time of... 1 hour 6 minutes! It's shorter time
>with the previous run, but still very much the same as with
>the original code, so at this time blobs didn't speed up
>things. That is tragical, because I already had strong
>faith in faster rendering. :=)

The scene below takes 2 seconds to render on my machine. I can imagine 
that fancy lighting and focal blur would slow it down, but not by that 
much.

How fast is your scene without the holes?


camera {location  <0, 2, -10> look_at <0,1,0> angle 40}
light_source { <0, 0, 0> color rgb 1  translate <-30, 30, -30>}

#declare CAN = difference {
   cylinder { <0, 0, 0>, <0, 3, 0>, 1 }
   cylinder { <0, -0.1, 0>, <0, 3.1, 0>, 0.97 }
}

#declare R1 = seed(123);
#declare HOLES = blob { threshold 1
   #declare N=0;
   #while (N<1000)
     sphere { <0.985,0.6,0>, 0.03, 10000
       rotate <0,rand(R1)*360,0>
       translate <0,rand(R1)*2,0> }
     #declare N=N+1;
   #end
}

difference {
   object {CAN}
   object {HOLES}
   pigment {rgb 1}
}


-- 
Mike Williams
Gentleman of Leisure

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