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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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