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I have had this problem once.
Use 'merge' instead of 'union' and manually bound it with a bounded_by { sphere
or box } as closely as possible.
POV will consider your wall as a single block and not as thousand of bricks.
It worked when I had thousands of spheres to render. Hope it will for you too.
> I made a scene of a stone wall. The stones were created as individual
> objects (a couple hundred of 'em), and the scene rendered properly in about
> 30 minutes at 1024x768 resolution. I decided to make a single "BrickWall"
> object (using a macro) that was a union of all the individual stones, and
> suddenly it took almost NINE HOURS to render the same scene, although it
> looked the same! Did I do something wrong? Is there a solution to this
> problem? I would like to keep the union so that I can easily manipulate
> multiple stone walls in my scene.
>
> Regards,
> Dave
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