Chris B wrote:

> Otherwise photons may be able to do what you want. I've not yet had much 
> success with photons myself, so someone else would need to comment on 
> whether they can be used to model how the light shining from a projector 
> through a translucent image would fall on a screen.

Well, I once tried this just to see if it worked and failed,
but succeeded now after revisiting the scene ;) At least, I
got *some* image projected onto the screen, which is rather
distorted but possibly correct for the crude "setup".

For realistic projections, I think the diameter of the light
source is also important. Shooting photons from a point light
has interesting effects, such as also getting an image when
no lens is present (simply magnified version of object).

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