POV-Ray : Newsgroups : povray.text.tutorials : Area Lights... for a florescent light Server Time: 22 Jan 2020 07:21:00 GMT
  Area Lights... for a florescent light (Message 1 to 6 of 6)  
From: Alan Nickerson
Subject: Area Lights... for a florescent light
Date: 2 Aug 2000 22:31:15
Message: <3988a133$1@news.povray.org>
I cannot seem to get an Area light to actually emit light as if it was a
single row of lights, to simulate a florescent light tube.

Alan


Post a reply to this message

From: Bob Hughes
Subject: Re: Area Lights... for a florescent light
Date: 3 Aug 2000 04:03:01
Message: <3988eef5@news.povray.org>
"Alan Nickerson" <ani### [at] iversoftcom> wrote in message
news:3988a133$1@news.povray.org...
| I cannot seem to get an Area light to actually emit light as if it was a
| single row of lights, to simulate a florescent light tube.

To phrase it shortly, they don't do that.  'area_light' is still a point
source when it comes to highlights, etc.  They're simply for shadow
smoothing.
To get the bulb to look right you'll need to use 'media', an emitting one at
that, or simply a high ambient in the bulbs finish statement of a cylinder
object.  Then use it as a 'looks_like' for the area light (you'll still need
the softer shadows).

Bob


Post a reply to this message

From: Chris Huff
Subject: Re: Area Lights... for a florescent light
Date: 3 Aug 2000 04:15:46
Message: <chrishuff-FFF266.23164002082000@news.povray.org>
In article <3988a133$1@news.povray.org>, "Alan Nickerson" 
<ani### [at] iversoftcom> wrote:

> I cannot seem to get an Area light to actually emit light as if it was a
> single row of lights, to simulate a florescent light tube.

The area light feature only affects shadows...for other lighting 
calculations, they are ordinary point lights.
There are two other ways to do what you want: a string of many point 
lights(slow and memory consuming), or a true area light made by using a 
high-ambient object and turning radiosity on(also slow and memory 
consuming, but can often be better than the other option).

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/


Post a reply to this message

From: Alan Nickerson
Subject: Re: Area Lights... for a florescent light
Date: 3 Aug 2000 13:12:45
Message: <39896fcd$1@news.povray.org>
Thanks, I didnt try a high-ambient for the object.
I did create a "tube' that glows using an emission media.

I'll try the high amiant.

thanks
Alan

"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-FFF266.23164002082000@news.povray.org...
> In article <3988a133$1@news.povray.org>, "Alan Nickerson"
> <ani### [at] iversoftcom> wrote:
>
> > I cannot seem to get an Area light to actually emit light as if it was a
> > single row of lights, to simulate a florescent light tube.
>
> The area light feature only affects shadows...for other lighting
> calculations, they are ordinary point lights.
> There are two other ways to do what you want: a string of many point
> lights(slow and memory consuming), or a true area light made by using a
> high-ambient object and turning radiosity on(also slow and memory
> consuming, but can often be better than the other option).
>
> --
> Christopher James Huff - Personal e-mail: chr### [at] maccom
> TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
> Personal Web page: http://homepage.mac.com/chrishuff/
> TAG Web page: http://tag.povray.org/


Post a reply to this message

From: Chris Huff
Subject: Re: Area Lights... for a florescent light
Date: 3 Aug 2000 18:06:59
Message: <chrishuff-9A0051.13075303082000@news.povray.org>
In article <39896fcd$1@news.povray.org>, "Alan Nickerson" 
<ani### [at] mathsoftcom> wrote:

> Thanks, I didnt try a high-ambient for the object.
> I did create a "tube' that glows using an emission media.

Emission media won't emit light(it doesn't illuminate surrounding 
objects), and radiosity in the official version won't see it. If you are 
using MegaPOV, the radiosity should work fine with media.

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
TAG Web page: http://tag.povray.org/


Post a reply to this message

From: Alan Nickerson
Subject: Re: Area Lights... for a florescent light
Date: 4 Aug 2000 13:00:55
Message: <398abe87$1@news.povray.org>
I'm using MegaPOV 0.5.

I have a union with the light fixture and a light_source that 'looks_like'
tube object that has emission media.

Alan

"Chris Huff" <chr### [at] maccom> wrote in message
news:chrishuff-9A0051.13075303082000@news.povray.org...
> In article <39896fcd$1@news.povray.org>, "Alan Nickerson"
> <ani### [at] mathsoftcom> wrote:
>
> > Thanks, I didnt try a high-ambient for the object.
> > I did create a "tube' that glows using an emission media.
>
> Emission media won't emit light(it doesn't illuminate surrounding
> objects), and radiosity in the official version won't see it. If you are
> using MegaPOV, the radiosity should work fine with media.
>
> --
> Christopher James Huff - Personal e-mail: chr### [at] maccom
> TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
> Personal Web page: http://homepage.mac.com/chrishuff/
> TAG Web page: http://tag.povray.org/


Post a reply to this message

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.