Image 3/3:
This image illustrates translating the cone *down* into the plane,
essentially removing the lower surface of the cone.
The photons are now visible on the plane (rather than being obscured by the
total internal reflections when the bottom of the cone is visible).

Also I forgot to add that doing this increased the render time significantly
(still, only about 16 minutes at 960x600, including photon building), but I
kept the max_trace_level at 255, so you might get a faster render by
lowering this. You will have to experiment if it will start to introduce
black areas again.

-- sooperFoX

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