"Alan Walkington" <alan[REMOVE]@walkington.net> wrote in message
news:3e8e32d4@news.povray.org...

> I've tried everything I can think of to get a laser beam effect that has
> photon interaction with media. The following works, but /only/ with a
> spotlight.  When I use a cylindrical light, the refracted (or reflected)
> photons stop interacting with the media.  Any ideas?

This sucks. I've got a sort of usable laser effect by sticking a point light
insde the closed end of a veeery looong cylindar open at the far end.  The
results are adequate, but its /very/ difficult to manouver. (A quick aside
... How is the center of rotation computed?)
-------------------
#declare GreenLaser = union {
    difference {
        cylinder {
            <-1,0,0>
            <60,0,0>
            .3
        }
        cylinder {
            <-.9,0,0>
            <60.1,0,0>
            .2
        }
    }
    light_source {
        <0.0.0 >
        color Green *20
    }
    texture {Polished_Chrome}
}

-------------------
Alan Walkington

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