I get this all the time, even with 1 GB system memory. I don't believe it
has anything to do with your RAM, but is an internal limit in POV. I believe
I was told this by someone in the TAG some time ago. Can anyone confirm?
d.

"Bob H." <omn### [at] msncom> wrote in message
news:3b38b264@news.povray.org...
> "POV-Ray News" <kyn### [at] cchatcom> wrote in message
> news:3b37f516@news.povray.org...
> > I have an 800Mhz Pentium III at work with 128Mb with a 256Mb swap file
> > running Windows 2000.  The following script file runs fine without any
> > problems.  Unfortunately when I run it on my home system with a 1.4 GHz
> > Pentium IV with 128Mb with a 300Mb swap file running Windows ME, I get
the
> > message:
> >
> > Slab building error.
> > Out of memory. Cannot allocate 327680 bytes for photons.
> >
> > The system shows only 56.5Mb of RAM in use.
>
> I was trying to think of when I had seen something like that recently,
maybe
> it was while my System Resources were so low things started going wrong.
I
> hibernate this computer all the time and it eventually degrades to the
point
> of a reboot being needed.  Anyhow, the 327680 looks familiar but I was
> thinking I saw it as 32768 instead.  Unfortunately I don't remember if
> photons were a part of that at all.
>
> Here's the stats:
> C:\Program Files\POV-Ray for Windows v3.1\scenes\photonmemorybug.pov
> Statistics, Resolution 160 x 120
> --------------------------------------------------------------------------
--
> Pixels:           19200   Samples:           19200   Smpls/Pxl: 1.00
> Rays:            778683   Saved:            100511   Max Level: 5/5
> --------------------------------------------------------------------------
--
> Ray->Shape Intersection          Tests       Succeeded  Percentage
> --------------------------------------------------------------------------
--
> Box                            4962262         3683979     74.24
> --------------------------------------------------------------------------
--
> Calls to Noise:                  0   Calls to DNoise:             10
> --------------------------------------------------------------------------
--
> Media Intervals:          12760600   Media Samples:         37838730
(2.97)
> Shadow Ray Tests:          3639126   Succeeded:               909663
> Reflected Rays:             321814   Total Internal:            5091
> Refracted Rays:             311634
> Transmitted Rays:            28400
> Number of photons shot:          98980
> Media photons stored:          9763500
> Priority queue insert:        97015921
> Priority queue remove:        48845455
> --------------------------------------------------------------------------
--
> Smallest Alloc:                 28 bytes   Largest:           327704
> Peak memory used:        195436684 bytes
> --------------------------------------------------------------------------
--
> Time For Parse:    0 hours  0 minutes   3.0 seconds (3 seconds)
> Time For Photon:   0 hours 13 minutes  51.0 seconds (831 seconds)
> Time For Trace:    0 hours 11 minutes  15.0 seconds (675 seconds)
>     Total Time:    0 hours 25 minutes   9.0 seconds (1509 seconds)
> Total cache size: 14800
>
> Returned from renderer
> POV-Ray finished
>
> I have 192MB physical and the Windows swap file went up to 412MB (Outlook
> Express and Explorer were running) and this is a 800MHz P3 running
> Millennium too.
> Your exiting light beam chops off and then continues faded, not sure why.
> Maybe the media 12,3 in the global photon block needs adjusting (100 is
the
> recommended), although you start with a pretty close spacing and the
factor
> of 3 could be okay; I really can't say.  And the intervals 20 might be a
bad
> thing, the Doc says to use intervals 1 and that more can produce unwanted
> artifacts since method 3 prefers to select its own value if more are
needed.
>
> Bob H.
>
>

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