[Radiance-general] rendering without shadow

[Brajesh Lal]

Hi Thomas,
Sorry for ambiguity. I need shadow pixel ids of the scene.
I am wondering if i can disable or enable the shadow casting feature of a 
particular object or scene ( like any other 3D packages). Then i can 
have rendered image with and without shadow. Their difference can give me shadow 
pixels. 
Or
If i can render the scene with some constant background color, then i can read 
the shadows pixel ids (low pixel value) in matlab.

my scene has only diffuse objects  ( diffuse reflectance can be of any value, no 
black object) and a single direct light.   

 Best Regards,     Brajesh Lal




________________________________
From: Thomas Bleicher <tbleicher at googlemail.com>
To: Radiance general discussion <radiance-general at radiance-online.org>
Sent: Thu, January 20, 2011 4:00:00 PM
Subject: Re: [Radiance-general] rendering without shadow

Brajesh.

Your problem description is a bit cryptic. Could you please clarify
what your problem exactly is and add a few details about your scene
and the exact command you  used to render your picture.

On Thu, Jan 20, 2011 at 2:58 AM, Brajesh Lal <brajeshlal at yahoo.com> wrote:

> I am using rpict command , i need to render the scene without shadows.
> How i can do it ?

Rendering a scene completely without shadow is probably possible but
it would not look good. You need shadows to see the shape of objects.

You seem to be new to Radiance so I am speculating a bit about your
problem: Your rendered an image but everything that is not in direct
(sun)light is totally black?

If this is the case you have to add the option "-ab 2" to your rpict
command line to calculate the light in areas that only receive
reflected light. Depending on your scene you should increase the "-ab
2" to "-ab 5" or "-ab 6" to capture the ambient light more accurately.
However, I assume that you also need to set other parameters to
improve the quality of your rendering/calculation.

Regards,
Thomas

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