Bouf <tof### [at] orekacom> wrote:
> POV3.5 beta 7 on Win98.
>
> I don't know if it's a bug, a forgotten feature or if it works as it has to.
>
> The double_illuminate feature doesn't take into account
> the indirect illumination (i.e. radiosity samples).
>
> Try the code below:
>
> // test double illuminate + radiosity
> box{<-10,-10,20>,<10,10,21> pigment{rgb 2}finish{ambient 1}}
> plane{z,0 pigment{rgb 1}finish{diffuse 1.2}
>  hollow double_illuminate
> }
> camera{location -10*z look_at 0}
> global_settings {
>  max_trace_level 30
>  adc_bailout 0.02
>  radiosity{
>   count 100
>   nearest_count 4
>   error_bound .5
>   recursion_limit 1
>   brightness 1.0
>
>   pretrace_start  .05
>   pretrace_end  .02
>
>   low_error_factor .5
>   gray_threshold 0.2
>   minimum_reuse 0.015
>   normal on
>
>   max_sample 2.0
>   adc_bailout .02
>     }
> }
>
> The scene renders completely black.
> If you put the camera on 10*z (outside of the plane),
> you see that the plane is illuminated by the (very) white box.
>
> Hope that it is possible (and easy) to implement.
>
> Thanks for all.
>
> Bouf.

I am wondering if this problem is solved? I am using double_illuminate scene and
found that the reflectance of the scene is underestimated (version 3.7.1).
Thanks in advance.

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