As I mentioned in previous comment about self illumination or glow can be done in sunflow by using the following method.
%% light sources
light {
type meshlight
name "meshlight"
emit 1 1 1
radiance 16
samples 32
points 4
-1.79750967026 -6.22097349167 5.70054674149
-2.28231739998 -7.26064729691 4.06224298477
-4.09493303299 -6.41541051865 4.06224298477
-3.61012482643 -5.37573671341 5.70054721832
triangles 2
0 1 2
0 2 3
}
This script can produce a rectangular shape mesh become self illuminating or emitting light in the scene. I think as a java programmer, you can easily work more on about it. And I will try to find more resource.
(I don't know the code but still working on it.)
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