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.

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