[Radiance-general] "INDIRECE"in .rif file

[Thomas Bleicher]

Victor.

*.rif files are not used for rtrace comands. Whatever differences
you find they are not caused by settings in the *.rif file.

It has been a while since I looked at the rad code but I'm pretty sure
that INDIRECT only affects the "-ab" value of the rpict comand.
Depending on your QUALITY setting is either INDIRECT = -ab
or INDIRECT=-ab-1. To keep the -ab value constant you have to
override it in with the "render=" option.

If you get different values for rtrace calculations you either just
see the typical error of the stochastic approach of Radiance or
your other ambient options are not high enough and your result
have a large variation.

How do you use the rif file with rtrace? Can you send details of
the rtrace commands and some info on the scene?

Regards,
Thomas

On Tue, Jan 26, 2010 at 7:40 AM, victor li <victorpirates at gmail.com> wrote:
> Hi:
>
> Does anybody knows why the different number of "INDIRECT" in .rif file could
> influence the result of illuminance in point calculation?
>
> I found that if i changed the "indirect" in .rif file, the illuminances in
> the defined grid are different even though the "ab" is the same in rtrace
> command. is anybody knows the reason?
>
> Best Regards!
>
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