[Radiance-general] Radiance, objline, objpict etc..

[steve michel]

Hi Thomas,


There is light in the scene but the lighting polygon is black not even lit. As you said I placed the polygons an inch blow the ceiling plane to no effect. It's important that the sources be visible for presentation purposes. 

here is the conversion syntax I used
ies2rad -df -t default -m .85 2X2TROFFER2T8.ies


and  these rpict options  without the -dv switch.

F syncfile -x 1024 -y 1024 -af ambfile -t 60 -vf views/Scene_1.vf -ps 3
-pt .08
-dp 512 -ar 309 -ms 0.072 -ds 0 -dj .5 -dt 0 -dc .5 -dr 1 -sj .7 -st .1
-aa .15 -ad 1500 -as 128 -av 0.01 0.01 0.01 -lr 8 -lw .002 -ab 7 -i -w -o
output.pic Scene_1.oct

I will redo the whole run with the -i option in ies2rad...

Thanks for the tip for objpict...

regards
Steve 

----------------------------------------
> From: tbleicher at arcor.de
> Subject: Re: [Radiance-general] Radiance, objline, objpict  etc..
> Date: Thu, 24 Jan 2008 19:29:05 +0000
> To: radiance-general at radiance-online.org
> 
> 
> On 24 Jan 2008, at 00:33, steve michel wrote:
> 
>>
>> I was running test renders to determine some electric lighting
>> levels at a back wall: I had run ies2rad for the fixtures and
>> associated the distribution to simple flat geometry
> 
> ies2rad does that for you. You don't have to add 'geometry'
> to make the light appear.
> 
>> to the same plane as the ceiling.
> 
> Bad move. Try to keep at least a tiny distance to the ceiling.
> Actually, ies2rad creates the light sources a few mm below the
> origin of the light distribution. If you place your fixture
> scene file (the .rad file that's created by ies2rad) at 2.5m
> the disc or rectangle will be at 2.4975m; enough for Radiance
> to keep light source and ceiling apart.
> 
>> When I render I don't 'see' the lights
> 
> Did you use the -i option for ies2rad? This would use an 'illum'
> type for the source which is invisible in a picture. The default
> light source should be visible, though.
> 
> Do you miss the bright light source itself or is there no light
> at all in your scene?
> 
>> so I ran objline and
>> objpict to check that the geometry of fixtures are there
>> and get the following errors:
>>
>> $ objline Scene_1.rad | x11meta
>> fatal - cannot open file "/usr/local/lib/ray/meta/vchars.mta", mode  
>> "r"
> 
> quick guess: this path is hardcoded in one of the scripts that are used
> by objline or x11meta. I think these tools are fairly uncommon these  
> days
> when everyone just fires up rvu to get a preview.
> 
>> $ objpict Scene_1.rad | ximage
>> oconv: system - cannot open scene file "/usr/local/lib/ray/lib/ 
>> testroom": No such file or directory
> 
> On my system I have '/usr/local/lib/ray/lib' hardcoded in the
> script 'objpict'. I use the /usr/local/ prefix so I can not say
> if it's adjusted by the installer or not. Your error suggests it's
> not so you could adjust the script yourself. The path is defined
> in the first line after the comments.
> 
>> 2-Could someone clarify the visibility of lighting distributions
>> in  radiance.
> 
> Typically light sources from IES files are visible, as disc,
> rectangle or box. You can use the '-i' option to allow a fancy
> fitting geometry to appear and still have the light distribution
> for the room. Also, the '-dv' option in rpict switches off the
> rendering of sources as bright objects (they will appear black).
> 
> Hth,
> Thomas
> 
> 
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