[Radiance-general] Three phase method

[Vayia V]

Hello,
Thank you for the reply and the help,
About the two BSDF, I have for example a BSDF for the pipe and then I have one more BSDF for the top (or bottom) part of the pipe. Can I somehow merge them and use them both?
As for the rfluxmtx, is there any tutorial available? 
Kind regards
Vayia
From: amcneil at lbl.gov
Date: Wed, 20 Aug 2014 18:14:43 -0700
To: radiance-general at radiance-online.org
Subject: Re: [Radiance-general] Three phase method

Hi Vayia,
You should consider using the new rfluxmtx to generate a transmission matrix for your lightpipe the resulting matrix won't be in a BSDF XML file format, but I don't think you need that format anyway. One benefit is you can specify any geometry for the entrance and exit (genBSDF requires parallel, rectangular ports).  


A general (untested) approach is below.
Finally, I'm not sure what you mean by two different parallel BSDFs. Can you elaborate?
Best,Andy





insideport.rad:#@rfluxmtx h=fk u=Ymaterials & geometry
outsideport.rad:#@rfluxmtx h=fk u=Ymaterials & geometry




sky.rad:#@rfluxmtx h=u u=Yground hemisphere#@rfluxmtx h=r1 uYsky hemisphere 

cat sensorpoints.txt | \	rfluxmtx -faa -ab 12 -ad 50000 -lw 2e-5	 -I \


		-y `wc -l < numeric/Space_1.map` \

		-  insideport.rad \
		materials.rad model.rad > view.mtx
rfluxmtx -ab 12 -ad 5000 -lw 2e-5 insideport.rad outsideport.rad \

	materials.rad model.rad > lightpipe.mtx

rfulxmtx -ab 2 -ad 1000 -lw 1e-3 outsideport.rad sky.rad \

	materials.rad model.rad > daylight.mtx









rmtxop view.mtx lightpipe.mtx daylight.mtx > dcoef.mtx
dctimestep dcoef.mtx sky.mtx > illuminance.txt








On Wed, Aug 20, 2014 at 4:46 AM, Vayia V <vaia13 at msn.com> wrote:








Hello all,
I have some more questions regarding the three phase method,
I understand that I cannot simulate bending pipes with the genbsdf. However I also need to simulate straight pipes that I think is able to be done. 


My question is if I need to specify the depth of the pipe somehow in any of the steps at the three phase method and how to do that. 
The way I create the geometry used at the daylight matrix and view matrix (meaning the two ends of the pipe) are in the "proper distance". But is this the correct way to do it (?) or the "entrance" of the pipe at the view matrix should be at the same position as the "exit" of the pipe at the daylight matrix (?) and then I specify the length of the pipe (that the "light" will travel through the pipe) between the "entrance" and "exit"? I suppose that maybe this way I could generate one bsdf of a long pipe and then use it for different length of pipes? 


Another question that I have is if I can use two different parallel BSDFs on one simulation.
Thank you in advance,


Vayia  
 		 	   		  

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