[Radiance-general] ambient bounces

[Jia Hu]

Thank you very much, Christopher and Thomas.

If I specify the value of "-av", does that mean the ray without hitting a
source will get some values (or contribution) that is related to "av". In
other words, "av" makes ray without hitting a source have some
contributions?

Regards,
Jia
On Tue, Apr 20, 2010 at 5:02 AM, Thomas Bleicher
<tbleicher at googlemail.com>wrote:

> Jia.
>
> If the number of bounces is exceeded without hitting a source or
> infinity the value specified with "-av" (ambient value) is used. The
> default value is "0 0 0" so you won't get any artificial contribution.
>
> You can use rvu to read the average value of a scene on the screen.
> This gives you a first approximation of -av.
>
> Regards,
> Thomas
>
> On Tue, Apr 20, 2010 at 6:11 AM, Jia Hu <hujia06 at gmail.com> wrote:
> > Hello all:
> >
> > If ab (ambient bounces) =3, after a ray reaches three times of diffuse
> > bounces and does not hit any lighting source, then how should Radiance
> > define the value of this ray, for example, radiance or irradiance, in
> order
> > to calculate the radiance at the viewpoint using backward ray tracing?
> I
> > read chapters about calculation methods in the book, Rendering with
> > radiance, but still a little confused.
> >
> > Thank you in advance.
> > Jia
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> >
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>
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