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Mike Williams wrote:
> It looks like you might be attempting to difference the
> can with a union of blobs each of which have a single
> element.
Yes, you're right.
> That doesn't gain you the advantage of the blob
> trick. What you have to do is difference the can with a
> single blob object that has lots of components.
>
> blob { threshold 1
> cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000 }
> rotate <0,RotY1,0>
> translate <0,PosY1,0>
> cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000 }
> rotate <0,RotY2,0>
> translate <0,PosY2,0>
> cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000 }
> rotate <0,RotY3,0>
> translate <0,PosY3,0>
> ...
> }
I assume you mean this (see the position of brackets):
blob { threshold 1
cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000
rotate <0,RotY1,0>
translate <0,PosY1,0> }
cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000
rotate <0,RotY2,0>
translate <0,PosY2,0> }
cylinder { <0,0.6,0><2,0.6,2>, 0.03, 10000
rotate <0,RotY3,0>
translate <0,PosY3,0> }
...
}
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. :=)
Larp
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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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