[Radiance-general] running radiance on multiple cores

[Greg Ward]

You need to tell us more about your scene and rendering parameters.  Sometimes, the direct calculation can cause variances.  Try setting -dt 0.

-Greg

> From: "Giovanni Betti" <gbetti at fosterandpartners.com>
> Date: May 24, 2012 7:10:52 AM PDT
> 
> Thanks everybody for the many replies.
>  
> Contrary to what Greg suggests, the error (varying brightness) happens with an ambient file specified.
> When I am trying different –av values, a triplet of 0s seems to give the best results.
> I haven’t tried yet the combination of vwrays and rtrace suggested below, will let you know how it goes on with that,
>  
> Thanks,
>  
> Giovanni
>  
>  
> From: Greg Ward [mailto:gregoryjward at gmail.com] 
> Sent: 23 May 2012 22:17
> To: Radiance general discussion
> Subject: Re: [Radiance-general] running radiance on multiple cores
>  
> Another workaround is to use vwrays and rtrace instead of rpiece, like so:
>  
> set vargs=`rad -s -n -V -v $vw $rif OPTF=render.opt`
> vwrays -ff -x $xr -y $yr $vargs | rtrace -n $nprocs -ffc `vwrays -d -x $xr -y $yr $vargs` @render.opt $octree > render.hdr
>  
> The first command sets the view and puts rendering options in a file for rtrace.  The side-effect is that every pixel gets rendered, and of course you will want to run pfilt on the output in most cases.  (You can of course add it to the command with "| pfilt -1 -x /3 -y /3 -r .6" after rtrace.)
>  
> -Greg
> 
> 
> From: "Jack de Valpine"<jedev at visarc.com>
> 
> Date: May 23, 2012 2:01:30 PM PDT
> 
>  
> 
> Unfortunately, I suspect you are correct...
> 
> Sent from my Verizon Wireless 4G LTE DROID
> 
> 
> -----Original message-----
> 
> From: "Randolph M. Fritz" <RFritz at lbl.gov>
> To: radiance-general at radiance-online.org
> 
> 
> On 2012-05-23 16:15:36 +0000, Greg Ward said:
> 
> > Some people have complained about misplaced or incomplete tiles using 
> > rpiece, but I haven't been able to reproduce or find the problem.
> 
> The problem seems--I say cautiously--to occur on Linux systems and not 
> BSD systems. I think I'm going to run a test.
> 
> Randolph
> 
> > As for varying tile brightness, this is usually caused by forgetting to 
> > specify an ambient file (rad AMBFILE variable), causing redundant and 
> > wasteful as well as inconsistent calculations.
> > 
> > -Greg
> > 
> >> From: "Giovanni Betti" 
> >> 
> >> Date: May 23, 2012 8:50:40 AM PDT
> >> 
> >> Dear List,
> >> 
> >> I am running into some issues while running radiance on multiple cores.
> >> I have radiance running on a Linux virtual machine and I am using the 
> >> rad –N option.
> >> Sometimes though, I happen to notice in the final image tiles of 
> >> varying brightness or even misplaced tiles.
> >> I thought it had to do with poor synchronization because of reading and 
> >> writing on the network, but it seem to happen also when I have all the 
> >> files on my local drive.
> >> Has anyone run into a similar problem and/or knows a solution for it?
> >> 
> >> Thanks in advance,
> >> 
> >> Giovanni
> 
> 
> -- 
> Randolph M. Fritz
> 
> 
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