[Radiance-general] RE : Light Shelf Reflections

[Shamim Javed]

That is wonderful!  Yes, I will look into the difference between mine and
yours.  I am also planning to make a physical model today to test it out in
real daylight.  More soon...

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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