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http://oxhouse.org/~brent/etc/exit/
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Tim Attwood nous illumina en ce 2009-04-16 16:22 -->
> http://oxhouse.org/~brent/etc/exit/
In Canada, they can only be red as stipulated in every provincial construction
codes.
The reason: If there is smoke, the red interact much less with it.
--
Alain
-------------------------------------------------
If it weren't for pickpockets, I'd have no sex life at all.
Rodney Dangerfield
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Tim Attwood wrote:
> http://oxhouse.org/~brent/etc/exit/
Interesting. I stay in the northeast US, guess that's why I've mostly
seen red.
Working in a theatre, I think that red is a lot nicer to use, since it
isn't as bright when all the lights are supposed to be off, but still
cuts through haze well.
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Exit signs are green over here.
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From: Jaime Vives Piqueres
Subject: Spotlights with photons (143KB) (Was: Hotel crime scene)
Date: 24 Apr 2009 06:06:40
Message: <49f18f30@news.povray.org>
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Hi again:
After Edouard mentioned IES light data files, I tried an experiment I
envisioned sometime ago: creating a realistic spot fixture and let it
reflect and refract some photons. The tests with just one spot seemed to
work nicely, but when I integrated it on the hotel scene with the same
photon spacing, the results don't look so great...
--
Jaime
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Attachments:
Download 'spot_photon_test-03.jpg' (19 KB)
Download 'spot_photon_test-03b.jpg' (19 KB)
Download 'hotelca-07.jpg' (68 KB)
Preview of image 'spot_photon_test-03.jpg'
Preview of image 'spot_photon_test-03b.jpg'
Preview of image 'hotelca-07.jpg'
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Jaime Vives Piqueres <jai### [at] ignorancia org> wrote:
> Hi again:
>
> After Edouard mentioned IES light data files, I tried an experiment I
> envisioned sometime ago: creating a realistic spot fixture and let it
> reflect and refract some photons. The tests with just one spot seemed to
> work nicely, but when I integrated it on the hotel scene with the same
> photon spacing, the results don't look so great...
I've tried that in the past too :-)
Your results have come out much better than mine did though - it was the first
time I used photons, so I probably didn't understand what I was doing
properly...
My plan had a "part two" to it (which I also didn't manage to do properly) - I
wanted to render the light and fixture, without any other scene elements, to a
full spherical camera, and use that as the transparency map for the light in a
real scene (possibly with the fixture modified with no_shadow). If you get what
I mean...
It's still on my list of things to experiment with, but perhaps as you are
having far more success than I ever did, it might be something you would find
interesting?
> Jaime
Cheers,
Edouard.
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From: Jaime Vives Piqueres
Subject: Re: Spotlights with photons (143KB) (Was: Hotel crime scene)
Date: 25 Apr 2009 02:33:54
Message: <49f2aed2@news.povray.org>
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> Your results have come out much better than mine did though - it was the first
> time I used photons, so I probably didn't understand what I was doing
> properly...
Are you supposing that I know what I'm doing with photons? ...then you
are wrong! ;)
Seriously, I only managed to get them right by using two passes, because
on "direct" usage I was getting only the photons but not the original light
source... by loading the photons on a second pass I got both the light and
the photons.
> My plan had a "part two" to it (which I also didn't manage to do properly) - I
> wanted to render the light and fixture, without any other scene elements, to a
> full spherical camera, and use that as the transparency map for the light in a
> real scene (possibly with the fixture modified with no_shadow). If you get what
> I mean...
>
> It's still on my list of things to experiment with, but perhaps as you are
> having far more success than I ever did, it might be something you would find
> interesting?
Very interesting idea... and I didn't think of it! But now you ruined my
Saturday plans... I'm not able to resist the temptation!
How will you proceed? ...perhaps projecting it into a sphere?
--
Jaime
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From: Ive
Subject: Re: Spotlights with photons (143KB) (Was: Hotel crime scene)
Date: 25 Apr 2009 06:28:13
Message: <49f2e5bd@news.povray.org>
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Jaime Vives Piqueres wrote:
> Hi again:
>
> After Edouard mentioned IES light data files, I tried an experiment I
> envisioned sometime ago: creating a realistic spot fixture and let it
> reflect and refract some photons. The tests with just one spot seemed to
> work nicely, but when I integrated it on the hotel scene with the same
> photon spacing, the results don't look so great...
>
> --
> Jaime
>
Just to make sure I do understand it right: you did *not* actually use
IES files, you 'just' did model a realistic spotlight with a refracting
mirror?
If my memory does serve me well there was (maybe a few years ago) a post
by someone who did in fact use IES files within POV-Ray. But while I'm
thinking about it, I have no idea how this could be achieved.
-Ive
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From: Ive
Subject: Re: Spotlights with photons (143KB) (Was: Hotel crime scene)
Date: 25 Apr 2009 06:31:22
Message: <49f2e67a$1@news.povray.org>
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refracting mirror?
err, what I wanted to say was reflecting mirror and/or refracting glass
cover.
-Ive
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From: Jaime Vives Piqueres
Subject: Re: Spotlights with photons (143KB) (Was: Hotel crime scene)
Date: 25 Apr 2009 06:42:05
Message: <49f2e8fd$1@news.povray.org>
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>
> refracting mirror?
>
> err, what I wanted to say was reflecting mirror and/or refracting glass
> cover.
>
Yes, that was the idea: I modeled with Wings3D a simple reflector with a
simple cover glass. I put a light inside and adjusted the photons to reflect
only on the reflector, and to refract only on the glass (otherwise I was
getting spotty results). It works decently with just one spot, but for a
bunch of them you need a lot of patience.
About the IES files, as I mentioned before, yes, I also remember someone
doing a patch or something to use them with POV-Ray... perhaps it was the
custom POV-Ray version from Dialux?
--
Jaime
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