Turn off the "eliminate maunal bounding" option (-ur). POV always thinks it
can bound better than you can, but it is frequently wrong when trying to
bound a difference.

turn on the display of bounding boxes (+ud) and see if huge areas of the
screen are in the bounding box of a small object

"Arnold the Aardvark" <aar### [at] NOTTHIStubulidentatademoncouk> wrote in
message news:3ba0d4cc$1@news.povray.org...
> I created a shape by using the difference between a torus
> and a union of many cylinders. This renders very slowly.
> If I render the union of cylinders as the object it is much,
> much faster. I am using bound_by.
>
> Are there any other optimisations I can use for the difference?
>
> Thanks.
>
>
> Arnold the Aardvark
>
>

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