Any comments on why the following doesn't work
http://local.wasp.uwa.edu.au/~pbourke/tmp/sim/testmodel.zip
It is supposed to be a rectangular cone with a light near the apex and a image
across the front of the cone. I was hoping to get a projected image onto a
second plane by using photons. It seems to work with a plane colour plane but
not with an image (with a 50% alpha value). Is alpha ignored with photons?
