i was thinking about making a real projection.  is there a way of giving a
ray of like composition? like for example, in a smoky room, it you turn on a
projector, and place a design on it, you will se the projector's ray
breaking up into parts.  is there a way of doing this pov-ray? or should i
just place a semi-transparant plane with a design on it in front of te
light-source?  but this seems to be taking too long in computing all the
photons

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