[Radiance-general] RE : Light Shelf Reflections

[Shamim Javed]

I do not know if radiance supports 'analysis grid' or its equivalent but if
it did, can I suspend one in 'mid-air' (say one at 30" off the floor) and
expect to get illuminance values off it?  Can it be a two-sided grid
registering both the light coming off the ceiling and the floor?  The
referenced file may explain my question a bit more:
https://www.dropbox.com/s/f5zsvjitub6fs6x/Analysis%20Grid_Question.pdf

Shamim.


On Sun, Mar 17, 2013 at 11:20 AM, Rob Guglielmetti <
rob.guglielmetti at gmail.com> wrote:

> The most direct way to derive the surface normal direction of a polygon is
> to simply look at the draw order of the polygon's vertices. Radiance
> polygons follow the "right hand rule", which means that a polygon that is
> planar to the x,y and drawn in a counter-clockwise fashion will have the
> surface normal running along the positive z axis.
>
> Sent from my iPad
>
> On Mar 16, 2013, at 11:43 PM, Shamim Javed <javeds2006 at gmail.com> wrote:
>
> Andy,
>
> How could you tell by just looking at the numbers that my ceiling surface
> normal was facing up?
>
> I am trying to import the results of the radiance simulation (with bands
> of light hitting the floor) on to an analysis grid to finally generate an
> illumination graph that would have progressive 'bumps' reflecting these
> light bands.
> https://www.dropbox.com/s/owvm7gqtamicdou/analysis%20grid.pdf
> Any suggestions on an effective way of doing this would be much
> appreciated.
>
> My radiance image has a distinct raddish tint unlike yours which came out
> with much more natural colors.  Any thoughts how I may improve this?
>
> Shamim.
>
>
> On Fri, Mar 15, 2013 at 7:18 PM, Andrew McNeil <amcneil at lbl.gov> wrote:
>
>> one more thing  - can you double check that the ceiling surface normal is
>> still facing downward (and that you didn't re-export geometry from
>> ecotect).  It seems odd that there is one reflection of the the floor but
>> none off the ceiling (the light that gets to the floor comes straight
>> through the window and misses the light shelf).  There should be the same
>> number of reflections from both.
>>
>> Andy
>>
>>
>>
>> On Fri, Mar 15, 2013 at 4:00 PM, Andrew McNeil <amcneil at lbl.gov> wrote:
>>
>>> Shaim,
>>> Can you try typing the commands I sent directly at the dos prompt?
>>> That would tell us if it is a problem with the outdated version of
>>> Radiance you are using or if it is a problem with the Ecotect Radiance
>>> Control Panel.  I still think it is a problem with the latter as the
>>> commands settings didn't get into the header created by Radiance.
>>>
>>> I'd rather determine if Ecotect related software is the cause now,
>>> rather than going further assuming that it is Radiance (which I doubt, but
>>> I am biased).
>>>
>>> Andy
>>>
>>>
>>> On Fri, Mar 15, 2013 at 3:45 PM, Randolph M. Fritz (i) <
>>> randolph+LD at panix.com> wrote:
>>>
>>>> 1998 is pretty old--it's possible we're giving you advice for newer
>>>> versions.
>>>>
>>>> NREL has a newer release of Radiance for Windows. I'm pretty sure you
>>>> can hook it up with Ecotect, but I'm not sure exactly how.  Anyone done
>>>> this?
>>>>
>>>> Randolph
>>>>
>>>>
>>>>
>>>> On 2013-03-15 20:19:41 +0000, Shamim Javed said:
>>>>
>>>>  I looked at the files generated by Radiance via Ecotect and it looks
>>>>> like the version of Radiance it is using is 3.1.8.  Here is a copy of one
>>>>> of the files generated:
>>>>>
>>>>> "#?RADIANCE
>>>>> oconv mirror_scorrected_sky.rad mirror_scorrected.rad
>>>>> rpict -t 120 -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 -dp 1024 -ar 45 -ms 0.17 -ds .3 -dt .1 -dc
>>>>> .5 -dr 1 -sj .7 -st .1 -ab 4 -af RCP.amb -aa .2 -ad 400 -as 64 -av 0.01
>>>>> 0.01 0.01 -lr 6 -lw .002 -i -x 64 -y 64 -ps 1
>>>>> SOFTWARE= RADIANCE 3.1.8 lastmod Thu Sep 17 20:49:56 PDT 1998 by
>>>>> droberts on escher"
>>>>>
>>>>> On Fri, Mar 15, 2013 at 2:22 PM, Randolph M. Fritz (i) <
>>>>> randolph+LD at panix.com> wrote:
>>>>> On 2013-03-15 15:17:59 +0000, Shamim Javed said:
>>>>>
>>>>> I tried to replicate your simulation image (using Radiance via
>>>>> Ecotect) but without success so far.
>>>>>
>>>>> Where did you get your copy of Radiance? Do you know what version it
>>>>> is?
>>>>>
>>>>> If not, "getinfo foo.hdr" will identify the version of Radiance that
>>>>> generated foo.hdr.
>>>>>
>>>>> Randolph
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>>
>>>>
>>>>
>>>> --
>>>> Randolph M. Fritz
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>
>>>
>>
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