Alain Martel <kua### [at] videotronca> wrote:

>
> > I also use:
> > global_settings{
> >      assumed_gamma 1
> >      radiosity{
> >          pretrace_start 1
> >          pretrace_end 1
> >          count 400
> >          recursion_limit 1
> >          nearest_count 1
> >          error_bound 0.05
> >      }
> > }
>
> That radiosity block make me twitch.
> pretrace_start and pretrace_end 1 are only to be used for the last pass
> of multipass rendering when all of the radiosity data have been saved
> from a previous pass.
> Even the default of 0.08 and 0.01 are to large. Using pretrace_end
> 0.0025 or less tend to give better result, and is often faster overall
> as more, and better, data are collected during pretrace.
>
> count is OK. Using the two value version will often improve the quality
> at nearly zero cost.
> count 400, 1111
>
> error_bound is acceptable for a scene using only radiosity illumination.
> If you use conventional light, then the default of 0.5 is sufficient.
>
> nearest_count 1 will often cause artifacts. Better to use the adaptive
> version : nearest_count 20, 3
>
>
> You should NOT use diffuse 1. It can cause some nasty side effect.
> Better keep the default value.
> So, change that #default to just :
> #default{finish{ambient 0}}
>
> And use emission 1 in the finish block to create some light emitting object.

Thanks! I found this comment to be very helpful!

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