POV-Ray : Newsgroups : povray.advanced-users : Glare Server Time
31 Oct 2024 19:27:54 EDT (-0400)
  Glare (Message 1 to 4 of 4)  
From: Andrew the Orchid
Subject: Glare
Date: 11 Dec 2004 15:50:50
Message: <41bb5daa$1@news.povray.org>
I'm talking about glare.

For example, the lights on your Christmas tree. Each light measures 
about 5mm across, and about 15mm long. If you took a lump of wood that 
size and looked at it from across the room, it's barely visible. If you 
render it with POV-Ray, the same thing happens.

And yet, because a light glows, you CAN see if from many meters away, 
even though it's very small. Why?

[And how do I tell POV-Ray about this? ;-) ]

Surely I'm not the first person to wonder...

Andrew.


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From: Alain
Subject: Re: Glare
Date: 11 Dec 2004 17:30:37
Message: <41bb750d$1@news.povray.org>
Andrew the Orchid nous apporta ses lumieres ainsi en ce 2004-12-11 
15:49... :

> I'm talking about glare.
>
> For example, the lights on your Christmas tree. Each light measures 
> about 5mm across, and about 15mm long. If you took a lump of wood that 
> size and looked at it from across the room, it's barely visible. If 
> you render it with POV-Ray, the same thing happens.
>
> And yet, because a light glows, you CAN see if from many meters away, 
> even though it's very small. Why?
>
> [And how do I tell POV-Ray about this? ;-) ]
>
> Surely I'm not the first person to wonder...
>
> Andrew.

A small luminous object alway apears larger than it realy is. It's a 
byproduct of the way the light censitive cells in your retina are 
connected together and to some scattering inside the eye and the retina 
itself.
You can add a little media containing sphere around the lights, around 2 
to 4 time the size of the "lights". That media could be emissive or 
scattering.

Alain


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From: Warp
Subject: Re: Glare
Date: 11 Dec 2004 17:34:02
Message: <41bb75da@news.povray.org>
http://www.geocities.com/ccolefax/lenseffects.html

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -


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From: Andrew the Orchid
Subject: Re: Glare
Date: 12 Dec 2004 03:46:00
Message: <41bc0548$1@news.povray.org>
Warp wrote:

> http://www.geocities.com/ccolefax/lenseffects.html

YAY! :-D

http://www.geocities.com/ccolefax/images/le_samp1.jpg
See, now that's exactly the kind of effect I *don't* want...

http://www.geocities.com/ccolefax/images/le_samp5.jpg
That's more what I'm after!

OK, let's go give that a try...

Andrew.


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