[Radiance-general] dctimestep & rtcontrib with sky subdivisions > 1

[Andy McNeil]

Hi Galen,

> tmp/p000.hdr does exist, as do all the other 248 images (for MF:2). 

Actually there should be 578 images, so you're probably exceeding the limit on number of open files.  On a mac the default is 256.  Once you hit the limit nothing else is written and you're left with a bunch of image files with a header and no data.

To check the limit type:
ulimit -a

To change the limit to 1024:
ulimit -n 1024

Changing it this way only applies to the current shell.  If you use a shell script you might need to add it to the script.

- Andy




On Feb 10, 2011, at 1:03 PM, Galen Burrell wrote:

> Hi All,
> I'm using rtcontrib for some glare studies (producing time series
> renderings for the year).  I'm puzzled by an error i get when using
> dctimestep & rtcontrib with sky subdivisions > 1.
> 
> This is the command i'm issuing:
> vwrays -ff -x 400 -y 400 -vf fisheye.vf | \
> rtcontrib $options -ffc `vwrays -d -x 400 -y 400 -vf fisheye.vf` -fo -e MF:2 \
> -f reinhart.cal -b rbin -bn Nrbins -o tmp/p%03d.hdr -m sky_glow -w 
> octrees/geom_sky.oct
> 
> then to combine these for a particular sky:
> 
> gendaylit $month $day $hour -W $radiation | genskyvec -m 2 | dctimestep
> tmp/p%03d.hdr > temp.hdr
> 
> this command always results in the following error:
> system - error reading picture 'tmp/p000.hdr'
> 
> tmp/p000.hdr does exist, as do all the other 248 images (for MF:2).  They
> are all only 4 kb however, which of course is wrong.
> 
> Everything works fine with the tregenza sky, for example:
> 
> vwrays -ff -x 400 -y 400 -vf fisheye.vf | \
> rtcontrib $options -ffc `vwrays -d -x 400 -y 400 -vf fisheye.vf` -fo \
> -f tregenza.cal -b tbin -bn Ntbins -o tmp/p%03d.hdr -m sky_glow -w
> octrees/geom_sky.oct
> 
> 
> Or even:
> 
> vwrays -ff -x 400 -y 400 -vf fisheye.vf | \
> rtcontrib $options -ffc `vwrays -d -x 400 -y 400 -vf fisheye.vf` -fo -e
> MF:1 \
> -f reinhart.cal -b rbin -bn Nrbins -o tmp/p%03d.hdr -m sky_glow -w
> octrees/geom_sky.oct
> 
> ...And using 'genskyvec -m 1' in the next command.
> 
> I have a feeling it's something obvious and hoping another set of eyes
> will help me find it.
> 
> Thanks!
> Galen
> 
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