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I think you're asking if a pattern could go into 'media' in place of a light shone
through a semitransparent
image and onward into the media.
Well, maybe so. A radial pattern could do that in a way but you would also need
multiple instances of that
pattern to get better 3D. And it would still be media, which translates to slow
anyway.
I'm sure there would be other ways to fake it using only transparent to
semitransparent cones for example, but
considering that you probably will need the media filling the room anyhow then the
image projection method
could be the choice above all else.
Someone else might chime in here also with a thing or two on this.
Bob
"DreyWerx" <you### [at] hotmail com> wrote in message
news:3a1aa74d$1@news.povray.org...
> 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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