[Radiance-general] ambient occlusion map ?

[Brajesh Lal]

Thanks Andrew,

yes if i give -ab 1 is direct calculation only then it is working.....
 
Best Regards,     Brajesh Lal


________________________________
 From: Andrew McNeil <amcneil at lbl.gov>
To: Brajesh Lal <brajeshlal at yahoo.com>; Radiance general discussion <radiance-general at radiance-online.org> 
Sent: Friday, March 15, 2013 5:53 PM
Subject: Re: [Radiance-general] ambient occlusion map ?
 

Brajesh,

This is expected behavior.  As Chris pointed out glow sources are sampled using the ambient calculation.  This is because glow was intended to model the sky, a very large area source.  It is much more efficient and accurate to sample the sky using the stochastic ambient calculation compared of the deterministic direct calculation.

With -ab 0 you get no light in your image from the glow (unless you can see the glow geometry in your view).  Setting -ab 1 when using a glow source is equivalent to a direct only calculation (ie without any inter-eflection effects).

Andy



On Fri, Mar 15, 2013 at 9:39 AM, Brajesh Lal <brajeshlal at yahoo.com> wrote:


>
>I render the image from camera point of view as i captured the real world scene. 
>
>and if i put any distant liht source e.g. sun -   then i can see the scene. but  can see the scene if we use object as light source...  
>
>
> 
>Best Regards,     Brajesh Lal
>
>
>________________________________
> From: Christopher Rush <Christopher.Rush at arup.com>
>To: Radiance general discussion <radiance-general at radiance-online.org> 
>Sent: Friday, March 15, 2013 4:57 PM
>Subject: Re: [Radiance-general] ambient occlusion map ?
> 
>
>Are you tracing the pixels from a view point looking at the black surface, to show the irradiance caused by the glow source, which is behind your view point contributing onto the black mesh surface? And the view point is a parallel projection?
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