Pretty sure it's a problem with any raytracer that utilizes BSP.  It's
necessary to keep bisecting the scene volume until the region your geo is
in is fully partitioned.  The issue isn't really absolute size, but the
ratio (more or less) between the total scene size and the smallest
triangles in it.

Are you using a distance limit with your AO? Would those objects really
need occlusion from parts of the environment 10,000 units away?

If the only visible geo with small detail is the objects in question, you
could also try translating the whole scene to put those pieces closer to
the origin.

Might help; sorry i don't have time to test myself.

etm

On Thu, Apr 19, 2012 at 2:18 PM, Tim Crowson <[email protected]
> wrote:

>
> 1) is this unique to MR?
> 2) is there a known solution? (apart from scaling the whole scene down,
> which is not an option)
> --
>

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