> A Mirror Surface (does not need to be visible, just must perfectly reflect
the
> light.)

If it's a planar mirror, you don't need photons at all. Just make a flat box
that represents the surface of the mirror and use this with a
projected_through light source. If this light source is on the opposite side
of the mirror, so that it's in the "mirror image" position of the real
light, then it will send light in exactly the right direction as though it
bounced off the mirror.

You might have to move the flat box very slightly off the surface of the
mirror to avoid coincident surface issues.

 - Slime
 [ http://www.slimeland.com/ ]

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