[Radiance-general] ambient occlusion map ?

[Andrew McNeil]

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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