[Radiance-general] Trans Rendering Issue

[Greg Ward]

Hi Garry,

This is probably one for the FAQ.  The "-i" option to rpict has special behavior for glass and trans surfaces, which are normally used to represent transparent materials.  I decided it was not very useful to visualize irradiance (or illuminance) on such surfaces, so my hack has rays just go right through them, allowing you to see whatever is on the other side.  This is not what everyone expects, however.

Rob Guglielmetti has this post showing the workaround if you really want to get irradiance on all of the first-intersected surfaces:

	http://www.rumblestrip.org/2003/03/19/rendering-falsecolor-on-glass-with-vwrays/

Cheers,
-Greg

> From: Garry Luu <Garry.Luu at steensenvarming.com>
> Subject: [Radiance-general] Trans Rendering Issue
> Date: September 17, 2015 7:07:05 PM PDT
> 
> Hi All,
>  
> I’m relatively new to Radiance. I’m using the trans modifier and am coming across issues when rendering.
>  
> When I try to render my scene for Illuminance values, the output render removes the translucent material from the scene, exposing the interior to the external exterior. However when I render for luminance results, everything works fine.
>  
> Has anyone come across this issue before and know what might be causing the issue.  
>  
> Thanks
>  
> Garry
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