[Radiance-general] RE : Light Shelf Reflections

Tue Mar 12 19:45:09 PDT 2013

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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