[Radiance-general] 答复: findglare problems

[Jan Wienold]

Hi Clarence,
I would trust the image more than the calculated one - in any case they should be the same ( I typically get less than 1% deviation when image and illuminance are simulated).
I recommend to let evalglare calculate dgp since a) it does all the math for you and b) it applies automatically the low light correction (see radiance workshop 2012).
I also recommend to check your task size/position using -T instead of -t as well as if the glare sources are detected correctly in your setting.  You can check both in your outout image.
The detection might be also your problem using findglare : your output shows that no glare source is found. So you may adjust your sensitivity (-t ) to a lower value than the default of 7.
good luck!
Jan

On 8 September 2018 10:53:24 CEST, Clarence Wang <wangjuncwz at hotmail.com> wrote:
>Hi Jan,
>
>I finally used the HDR image after "pcomb" for evalglare analysis and
>the command seemed to work well and produced desired values as well.
>Should I replace the vertical illuminance (E_vert) resulted by
>evalglare with that resulted by Radiance simulation to calculate the
>DGP, although the evalglare could produce the DGP value after the
>command was conducted. The command is as follows:
>
>For no zonal evaluation: evalglare -t 400 400 0.9 -d -c output.hdr
>fisheye1.hdr
>
>Thanks,
>
>Clarence
>________________________________
>发件人: Jan Wienold <jan.wienold at epfl.ch>
>发送时间: 2018年9月7日 17:02
>收件人: radiance-general at radiance-online.org
>主题: Re: [Radiance-general] findglare problems
>
>
>Hi Clarence,
>
>
>just to be sure: don't use falsecolor BEFORE you apply any glare
>evaluation tool ! Falsecolor is a tool to display the luminance
>distribution in a false color and the resulting image does not contain
>the real luminance information any more... You should use the HDR for
>findglare (or evalglare) after the pcomb (and getinfo command).
>
>
>Jan
>
>
>On 07.09.18 17:12, Greg Ward wrote:
>Hi Clarence,
>
>I would have to see the output of findglare #2 to tell you why DGI
>values were "nan."
>
>As for #1, rcontrib doesn't put the view in its output, so you should
>add it back with:
>
>getinfo -a "`cat fisheye.vf`" < fisheye.hdr > fisheye1.hdr
>
>then use "fisheye1.hdr" in your findglare command.
>
>Best,
>-Greg
>
>
>From: Clarence Wang
><wangjuncwz at hotmail.com<mailto:wangjuncwz at hotmail.com>>
>
>Date: September 7, 2018 12:29:26 PM GMT+02:00
>
>
>Hi lists,
>
>I tried to use "findglare" and "glarendx" to obtain DGI value from a
>Radiance hdr image and was confused about the results.
>
>
>1.  When I conducted a command " findglare -r 800 -p fisheye.hdr -vf
>fisheye.vf a.oct > a.glr ", the terminal showed " cannot get view from
>picture "fisheye.hdr";
>2.  Though the other command " findglare -vf fisheye.vf -ga 10-180:10
>-av .1 .1 .1 a.oct > a.glr " could result in desired values, such as
>the glare source and the indirect illuminance, the DGI values were
>"nan" when using the command " glarendx -t dgi a.glr".
>
>Any suggestions to solve the problems like "cannot get view from
>picture" and the "nan" results?
>
>The hdr image of 800*800 pixels was rendered by "rcontrib" , "pcomb"
>(containing skyglow and groundglow) and "falsecolor" .
>
>Thanks,
>
>Clarence
>
>
>
>
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>
>
>--
>Dr.-Ing.  Jan Wienold
>Ecole Polytechnique Fédérale de Lausanne (EPFL)
>EPFL ENAC IA LIPID
>
>http://people.epfl.ch/jan.wienold
>LE 1 111 (Office)
>Phone    +41 21 69 30849

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