"Ron Parker" <ron### [at] povrayorg> wrote...
> It goes in RAM because the hard disk would be too slow.  The octree is
used
> to find the closest sample while rendering, so looking it up in a database
> would kinda suck, render-time-wise.

Actually, if done properly, many of the leaf nodes could be stored on disk
and cached in memory only as needed.  I'm thinking of something similar to
what can be used for raytracing displacement maps (I read a paper about that
once).

-Nathan

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