Mike Williams wrote:
> 
> I did a scene a while ago with hundreds of small cylindrical holes in
> a flat slab and experimented with cutting the slab into smaller pieces
>  with just a few holes in each piece. It turned out that the rendering
>  was fastest when each piece was so small that it contained only one
>  hole.

You can also use one big slab, but merge groups of the cylinders and
put bounding boxes around each group.

Regards,
John
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