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

[steve michel]

Rob,

The fixture is a recessed fluorescent with a flat translucent lens; therefore my needs are simply to show a glow for the lens on the same plane as the ceiling. I applied the ies distribution to a simple polygon. But anyways, for purposes of rigor I think I'll look for the latest edition of RwR. Can someone post the link to the best method of obtaining the book??..


regards
Steve

----------------------------------------
> From: rpg at rumblestrip.org
> Subject: Re: [Radiance-general] Radiance, objline, objpict  etc..
> Date: Sat, 26 Jan 2008 08:51:21 -0700
> To: radiance-general at radiance-online.org
> 
> 
> On Jan 25, 2008, at 5:34 PM, steve michel wrote:
> 
>>
>> 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.
> 
> I may have missed this, but what kind of light fixture is it?  If  
> it's a low brightness downlight or something similar with good  
> shielding, It may just be that your viewing angle to the light source  
> is shallow enough that you cannot see any luminance.  Radiance will  
> render the disc according to what the ies file says is appropriate  
> for that angle.  It does tend to appear "all or nothing", that is, if  
> you're looking straight up into the fixture the disc is all white and  
> very shallow angles appear all black.  If you want to model the  
> appearance of the light fixture itself, you will have to get a little  
> fancier and model the geometry, include a glow material for the lamp  
> brightness, and enclose the whole thing in an illum sphere and apply  
> the luminance distribution to that.  This is well detailed in RwR and  
> in various posts on this list.  I have little experience doing this  
> without the help of front ends like Rayfront, but several people  
> around here are.  For my needs, the default rendering of the light  
> sources is generally adequate.
> 
> - Rob Guglielmetti
> www.rumblestrip.org 
>   
> 
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