[Radiance-general] RE : Light Shelf Reflections

Tue Mar 12 20:10:58 PDT 2013

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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