[Radiance-general] Transparency

Wed Mar 9 17:37:06 CET 2005

Marisela,

I haven't seen your pictures but my guess is - without jumping to wrong conclusions -that  your material, pressumably a 'trans' material, disapears from the images because its an illuminance image - the last reflection is missing.  Try and run a luminance simulation and check if it becomes visible.

Jochen

-----Original Message-----
From: radiance-general-bounces at radiance-online.org
[mailto:radiance-general-bounces at radiance-online.org]On Behalf Of Greg
Ward
Sent: 08 March 2005 15:27
To: Marisela Mendoza
Cc: Radiance general discussion
Subject: Re: [Radiance-general] Transparency

Hello Marisela,

Your image(s) did not come through in your e-mail.  Please try sending 
them to me directly at <gregoryjward at gmail.com> and perhaps I can 
answer your question.

-Greg

> From: Marisela Mendoza <marichurad at yahoo.co.uk>
> Date: March 8, 2005 2:48:55 AM PST
>
I am using desktop radiance in Ecotec.  I am trying to analyse the 
glare effect produced by applying different screen transparency on a 
window.  But when I applied the transparency in Ecotec to the screen 
material,  (i.e. 12% )  the material disappear from my renderings.   I 
know the material still there it is there since I can see the shadows 
it proyects on the floor.   I enclose some of the images I got. 

Figure 1 shows the deskto radiance rendering view from an exterior 
camera that faces the window of a room  which has these exterior 
octagonal modules. The modules material that I chose is fabric with a 
transparency of 0% for this case.

Figure 2 shows the interior of the room and the shadows projected on 
the floor by the modules.

Figure 3 shows the same camera view as Figure 1.  But in this case I 
changed the transparency material in Ecotec to be 60% and the modules 
are not visible anymore as it can be seen in.   However when I render 
with desktop radiance an interior view similar to the one in  Figure 2, 
it turns out that the modules are actually projecting shade, see Fig 4. 
 It is quiet strange that the transparency material can be perceived on 
the projected shadows but it is not shown on the material itself.

Anyone has clue of what is happening?

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