[Radiance-general] RE : Light Shelf Reflections

Andrew McNeil amcneil at lbl.gov
Fri Mar 15 09:37:04 PDT 2013 

My guess is that the issue is related to Ecotect.  Does ecotect export a
bat file that you can modify and run outside of ecotect?

Andy


On Fri, Mar 15, 2013 at 8:17 AM, Shamim Javed <javeds2006 at gmail.com> wrote:

> Andy,
>
> Pictures from my model:
> https://www.dropbox.com/s/xz5glrx34o4cucz/LS%20Ref_Model%20Pic_14mar.pdf
> They do validate your simulation results.
>
> I tried to replicate your simulation image (using Radiance via Ecotect)
> but without success so far.  I used the Radiance Control Panel in Ecotect
> to insert the values you had used for your simulation but continue to get
> my previous picture. How long did your image take to generate?
>
> Shamim.
>
>
> On Tue, Mar 12, 2013 at 11:10 PM, Andrew McNeil <amcneil at lbl.gov> wrote:
>
>> My result is much different.  With gray walls, perfect mirror floor and
>> ceiling and using a time of 11.75 for the sky my rendering looks like this:
>> http://dl.dropbox.com/u/16523492/test.tif
>> (cool infinity box effect!)
>>
>> Here is the model that I use (which is just your model modified as I had
>> suggested):
>> http://dl.dropbox.com/u/16523492/Test.zip
>>
>> And these are the commands I use:
>> oconv mirror_s.rad mirror_s_sky.rad > test.oct
>>
>> rvu -vth -vp 9.628 4.564 6.510 -vd -1.701 0.360 -0.007 -vu 0 0 1 -vh 180
>> -vv 180 -vs 0 -vl 0 -dr 20 -lr 20 -ps 1 -ab 3 test.oct
>>
>> maybe you can spot the difference between what I'm doing and what you're
>> doing?
>>
>> Andy
>>
>>
>> On Tue, Mar 12, 2013 at 7:45 PM, Shamim Javed <javeds2006 at gmail.com>wrote:
>>
>>> I tried the suggestions but could not get to the anticipated outcome.
>>>  See results:
>>>
>>> https://www.dropbox.com/s/hyr4i0dylr7htzp/SJ_Light%20Shelf%20Reflections_Gray%20Walls.pdf
>>>
>>> Any other thoughts most welcome!
>>>
>>>
>>> On Tue, Mar 12, 2013 at 8:34 PM, Andrew McNeil <amcneil at lbl.gov> wrote:
>>>
>>>> Are you expecting to see them in your rendering?  This will not be the
>>>> case in the way that you set up your model.  The light will not be visible
>>>> on a perfect mirror because all light is reflected in the mirror direction
>>>> - none to the view point.  And all your walls are perfectly absorbing so
>>>> you won't see any light patterns on those either.  Your view will only show
>>>> reflection of the perfectly black walls.  The multiple reflections should
>>>> show up in your illuminance calcs though.
>>>>
>>>> I suggest changing the walls to gray and changing the time of day to
>>>> 11:45.  Then you should see reflection patterns along the west wall of your
>>>> model.
>>>>
>>>> Andy
>>>>
>>>>
>>>>
>>>> On Tue, Mar 12, 2013 at 4:32 PM, Shamim Javed <javeds2006 at gmail.com>wrote:
>>>>
>>>>> That was an aspect I had not thought about.  Thanks for the tip!  I
>>>>> went back and fixed the surface normal's in my model.  It did not, however,
>>>>> create the reflections I am looking for.
>>>>>
>>>>>
>>>>> On Tue, Mar 12, 2013 at 6:03 PM, Andrew McNeil <amcneil at lbl.gov>wrote:
>>>>>
>>>>>> Shamim,
>>>>>>
>>>>>> Your ceiling surface normal is facing up (which matters for the
>>>>>> mirror type).  Change polygon zone91.rad00770 to what is copied below.
>>>>>>
>>>>>> Also make sure that you set -dr and -lr parameters to the number of
>>>>>> mirror reflections you want to have (8 or so?).
>>>>>>
>>>>>> Let me know if you still don't see what you are expecting.
>>>>>>
>>>>>> Best,
>>>>>> Andy
>>>>>>
>>>>>>
>>>>>>
>>>>>> Morror_Ceiling polygon zone91.rad00770
>>>>>> 0
>>>>>> 0
>>>>>> 15
>>>>>>   1.21920  2.89560  7.16280
>>>>>>   1.21920  21.18360  7.16280
>>>>>>   10.36320  21.18360  7.16280
>>>>>>   10.36320  2.89560  7.16280
>>>>>>   1.21920  2.89560  7.16280
>>>>>>
>>>>>>
>>>>>> On Tue, Mar 12, 2013 at 1:47 PM, Shamim Javed <javeds2006 at gmail.com>wrote:
>>>>>>
>>>>>>> Apologies for sending the wrong link.  Here is one that should work!
>>>>>>>
>>>>>>> https://www.dropbox.com/sh/a8e7o5mugbluqdn/GVS1vZKjNC
>>>>>>>
>>>>>>>
>>>>>>> Shamim.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Tue, Mar 12, 2013 at 1:00 PM, shailan zareiy <sh.zareiy at gmail.com
>>>>>>> > wrote:
>>>>>>>
>>>>>>>> hi Shamim
>>>>>>>> do you assign the mirror surfaces as secondary light source? if you
>>>>>>>> use ecotect for modelling, in the material assignment of this software, in
>>>>>>>> the advanced export you should write this discription :
>>>>>>>>  void mirror materail name
>>>>>>>> 0
>>>>>>>> 0
>>>>>>>> 3  1 1 1
>>>>>>>> does it solve the problem?
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Mar 11, 2013 at 6:45 PM, Compagnon Raphaël <
>>>>>>>> Raphael.Compagnon at hefr.ch> wrote:
>>>>>>>>
>>>>>>>>> If all these surfaces are mirrors, then you cannot see
>>>>>>>>> anything.... unless:
>>>>>>>>> - there is a non-mirror reflecting object somewhere in your scene
>>>>>>>>> that is supoposed to be lit by the multiple-reflecting light path; since it
>>>>>>>>> will reflect light in many directions you should see it!
>>>>>>>>> or
>>>>>>>>> - your point of view is located somewhere on the
>>>>>>>>> multiple-reflecting light path and your view direction points towards it.
>>>>>>>>> Then you should directly see the light source appearing as an image on the
>>>>>>>>> last mirror.
>>>>>>>>>
>>>>>>>>> Raphaël
>>>>>>>>> ________________________________
>>>>>>>>> De : Shamim Javed [javeds2006 at gmail.com]
>>>>>>>>> Date d'envoi : lundi 11 mars 2013 15:56
>>>>>>>>> À : Radiance general discussion
>>>>>>>>> Objet : Re: [Radiance-general] Light Shelf Reflections
>>>>>>>>>
>>>>>>>>> I am hoping to see multiple reflections of the light beam
>>>>>>>>> reflected off the light shelf top surface in both the floor and the ceiling
>>>>>>>>> (all of which are mirror surfaces).
>>>>>>>>>
>>>>>>>>> On Mon, Mar 11, 2013 at 10:40 AM, Jack de Valpine <
>>>>>>>>> jedev at visarc.com<mailto:jedev at visarc.com>> wrote:
>>>>>>>>> Hi Shamim,
>>>>>>>>>
>>>>>>>>> What changes are you expecting to see?
>>>>>>>>>
>>>>>>>>> -Jack
>>>>>>>>>
>>>>>>>>> --
>>>>>>>>> Jack de Valpine
>>>>>>>>> President
>>>>>>>>>
>>>>>>>>> Visarc Incorporated
>>>>>>>>> www.visarc.com<http://www.visarc.com>
>>>>>>>>>
>>>>>>>>> channeling technology for superior design and construction
>>>>>>>>>
>>>>>>>>> On 3/11/2013 10:03 AM, Shamim Javed wrote:
>>>>>>>>> I am using Radiance via Ecotect.  I have played around with
>>>>>>>>> changing the values for -dr, -av and -ab without seeing any change in the
>>>>>>>>> image output.
>>>>>>>>>
>>>>>>>>> On Mon, Mar 11, 2013 at 9:20 AM, Christopher Rush <
>>>>>>>>> Christopher.Rush at arup.com<mailto:Christopher.Rush at arup.com>>
>>>>>>>>> wrote:
>>>>>>>>> Are you using the default parameters for rpict/rtrace? Have you
>>>>>>>>> tried setting the -dr parameter greater than 2? If you post the command you
>>>>>>>>> are using to calculate the reflections, it may be easier to comment. I
>>>>>>>>> suspect it will be more complicated than the -dr setting, but that's a
>>>>>>>>> start.
>>>>>>>>>
>>>>>>>>> >  I have been unsuccessful, so far, to generate  more than two
>>>>>>>>> reflections.
>>>>>>>>>
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