Someone requested an update on the photon mapping patch.  Here's a pic.  :)

Here we see three lenses lit by three light sources.  The middle lens
has photon mapping turned off (the default), so it casts normal filtered
shadows just like any other object.  If you look on the blue box, you'll
see light reflected from the bronze box.  There's also some light reflected
from the bronze box that goes through the lens nearest to the camera.

Image stats:
size: 320x240
aa: 0.3
render time: 3:25
number of photons: 67,968
peak memory used: 3,004,062

-Nathan

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