[Radiance-general] running radiance on multiple cores

[Giovanni Betti]

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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