[Radiance-general] running radiance on multiple cores

[Giovanni Betti]

Hi Greg,

 

Thanks for the tip, and sorry for the late reply.

 

Setting -dt to 0 actually sorted the issue (although, as expected,
rendering time went up a lot!)

 

The scene I am rendering is an interior scene with a lot of artificial
lights, no sun or sky (yet).

 

The rif file looks something like:

 

scene=  Materials.rad  Geometry.rad

 

AMBFILE= test.amb 

OCTREE= test.oct 

 

RESOLUTION= 1195 761 

DETAIL= MEDIUM

VARIABILITY = MEDIUM 

QUALITY= LOW

 

INDIRECT= 2 

REPORT=2

 

render=   -ad 2048   -as 1024 -dt 0.05 -dc 0.15 -ds 0.02 -dj 0 -av 0 0 0

 

view= View10 -vtv -vp -220.898262 490.000427 9.770000 -vd -0.310859
2636.535561 0.000000 -vu 0 0 1 -vh 71 -vv 51 -vs 0 -vl 0 -vo 0 -va 0

 

 

Best,

 

Giovanni

 

From: Greg Ward [mailto:gregoryjward at gmail.com] 
Sent: 24 May 2012 15:55
To: Radiance general discussion
Subject: Re: [Radiance-general] running radiance on multiple cores

 

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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