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From: Steve Ziuchkovski
Subject: Reflecting media affected laser beams
Date: 3 Jul 1999 14:30:13
Message: <377e56b5@news.povray.org>
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I have created a scene that uses a cylindrical light, atmospheric media, and
some mirrors in order to simulate a laser beam. Looks pretty good, except
for one problem...
The beam is visible (due to the scattering particles) just fine before it
strikes a mirror. But, it does not reflect off the mirror, but just stops
there as if it was a non reflecting object. I _can_ see the reflection of
the beam in the mirror, but the beam itself doesn't bounce.
Make sense? I can post the scene if I didn't describe it well enough. It's
pretty small.
Steve
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Steve Ziuchkovski wrote:
>
> I have created a scene that uses a cylindrical light, atmospheric media, and
> some mirrors in order to simulate a laser beam. Looks pretty good, except
> for one problem...
>
> The beam is visible (due to the scattering particles) just fine before it
> strikes a mirror. But, it does not reflect off the mirror, but just stops
> there as if it was a non reflecting object. I _can_ see the reflection of
> the beam in the mirror, but the beam itself doesn't bounce.
>
> Make sense? I can post the scene if I didn't describe it well enough. It's
> pretty small.
>
> Steve
The official build of Pov does not support true reflective caustics. These
are what is needed to simulate the effect you are looking for. Fortunatly
there is a new patched version of pov that offers this ability called UVPov
which has photon mapping as one of it's features. This patch is available at:
http://nathan.kopp.com/patched.htm
The only other way to simulate the effect you are looking for is to add
a second set of lights for each reflected beam at the angle you would expect
if it had actually bounced.
--
Ken Tyler
mailto://tylereng@pacbell.net
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I don't think photon mapping has media implemented yet, although you
could use a bunch of semi-transparent partitions to simulate it. I could
be wrong, though.
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From: Steve Ziuchkovski
Subject: Re: Reflecting media affected laser beams
Date: 3 Jul 1999 17:12:01
Message: <377e7ca1@news.povray.org>
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> The only other way to simulate the effect you are looking for is to add
>a second set of lights for each reflected beam at the angle you would
expect
>if it had actually bounced.
I'll have to get the patch and try it then. I wouldn't be able to add a
second set of lights, unfortunately. The mirrors I have the beam reflecting
off of are going to be moving, and I want to see how it effects the beam.
Basically, I'm using POV to simulate a laser show setup before I build it,
so I can position my mirrors correctly in the real world (I have the
coordinates (not to scale) in my source file!). Also, I don't have all the
gear yet and I'm very impatient.... :)
Thanks for the help!
Steve
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