"Charles C" <nomail@nomail> wrote:
> Alain <ele### [at] netscapenet> wrote:
> > How many objects in the first set of frames? Is it less than the bounding
threshold?
> > If the answer the second question is YES, then there will be NO bounding at all
> > for the entire animation.
> > A solution: add 1 or 2 dumy objects, like small sphere with no_image, no_shadow
> > and no_reflection or objects placed off field: behind the camera or
> > behind/inside some opaque object.
> > Others have been hit with that problem in animation with a growing number of
> > objects: 0 to 2 objects in the first frame and eventualy 1000s in subsequent
frames.
>
> That's interesting but doesn't fit with my experiences...  I made a simple
> system for doing "distributed" animation rendering where basically each
> machine or instance of POV-Ray renders an empty frame if a flag-file has
> been produced by another machine on a shared drive.  Anyway, I haven't seen
> or at least I haven't noticed a slow-up for starting with empty frames.
> Also see my results I posted for a variation of Greg's sample. Slow up
> occurs on late frames but only after a period of empties, even if the early
> frames aren't empty.   I guess I replied in the wrong place, but here's
> where it's at:
>
>
http://news.povray.org/povray.text.scene-files/message/%3Cweb.45ca98cae9bbeb3a632e613b0%40news.povray.org%3E/#%3Cweb.
45
> ca98cae9bbeb3a632e613b0%40news.povray.org%3E


I have to take back part of what I said... I tried my little distibuted
rendering system with a more complicated scene which I guess needs the
bounding more than my other one.  Instance #1 on Machine A flags frame #1
and renders it in seconds.  Instance #2 on Machine A sees that frame #1 has
been flagged and renders an empty frame and goes on and flags frame #2 and
starts rendering it at a snail's pace (read ~1+ hours? instead of < ~1min).
 Instance #1 finishes frame #1 renders an empty frame #2 and goes on to
render frame #3 at a snail's pace.  Any other instance of POV-Ray on any
machine render at a snail's pace.  The distro system itself works like a
charm but there's not a lot of point when running into this.....

Charles

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