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> As the tubes are transparent, using emiting media should be considered, but this
will also increase
> rendering time.
Emitting media is surprisingly fast. In the image below (of neon tubes)
http://news.povray.org/povray.binaries.images/thread/%3Cweb.42d71153a5704711500142a10%40news.povray.org%3E/?ttop=217682
&toff=100
I used an emitting media with a density map to get some variability in the
light. I also used some scene lighting to get a bit of a hazy glow in the
atmosphere around the lights.
I seem to remember it only took a few minutes, but sadly I lost the file
when my computer was replaced.
Joanne
http://www.onewhiteraven.com
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I would use MegaPov's glow feature. (Used to produce the image below which
is only partially rendered.) This was just a modification to one of the
sample scenes (written by Christoph Hormann) and the tube lights are
generated with the following code:
#version unofficial MegaPov 1.1;
#declare Brightness = 54;
#default {
texture {
pigment { color rgb 1.5 }
finish { diffuse 1 ambient 0.0 }
}
}
camera {
location <-92, -12, -35>
direction z*1.5
right 1.33333*x
look_at <-73, 0.0, 0>
}
#macro Glow(Color)
media {
emission 1
density {
cylindrical
poly_wave 5
density_map {
[0 rgb 0]
[1 rgb Color]
}
}
method 3
}
#end
#declare ls = union {
cylinder {
<0, 0, 0> <0, 10, 0> 1
hollow on
pigment { rgbt 1 }
interior { Glow(<1.0, 1, 1>*Brightness) }
no_image
}
cylinder {
<0, 0, 0> <0, 10, 0> 1
hollow on
pigment { rgbt 1 }
interior { Glow(<0.1, 0.2, 1.0>*Brightness) }
no_radiosity
}
rotate <-90, 0, 0>
translate <-70, 24, 0>
}
object { ls rotate <0, -20, 0> }
object { ls rotate <0, 0, 0> }
object { ls rotate <0, 20, 0> }
object { ls rotate <0, 40, 0> }
object { ls rotate <0, 60, 0> }
object { ls rotate <0, 80, 0> }
object { ls rotate <0, 100, 0> }
Of course if you don't want simple shapes (cylinder, sphere box etc.) you
might have a bit more difficulty..
Sean
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Attachments:
Download 'glow.jpg' (53 KB)
Preview of image 'glow.jpg'
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From: Mike Raiford
Subject: Re: Neon Tubes (Anyone can tell me how to make them emit light)
Date: 8 Sep 2005 09:56:48
Message: <43204320$1@news.povray.org>
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NumbC wrote:
> Anyone got a solution for good realistic neon lights? I am currently trying
I'm with everyone else:
radiosity+emitting media.
It seems your neons are torroidial, so use a torus function, something like:
#declare neon_light =
torus
{
2, 0.1
pigment { color rgbt 1 }
finish { ambient 4.0 diffuse 0 reflection 0.5}
hollow
interior
{
media { emission rgb <1, 0.01, 0.001> *15
density
{
function { f_torus(x,y,z,2,0.05)}
}
}
}
}
The radiosity block I used:
radiosity
{
pretrace_start 0.08
pretrace_end 0.01
low_error_factor .8
count 100
nearest_count 20
recursion_limit 4
error_bound 1
brightness 1
media on
}
I'll attached a file of what this will look like. Please excuse me if
the object looks similar. I liked it and wanted to make it look the same
(but makes a darn good demo-scene) :)
Adjust the colors in any way you wish. I chose a more typical red for
the neon.
--
~Mike
Things! Billions of them!
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From: Mike Raiford
Subject: Re: Neon Tubes (Anyone can tell me how to make them emit light)
Date: 8 Sep 2005 10:11:06
Message: <4320467a@news.povray.org>
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Mike Raiford wrote:
> NumbC wrote:
>
>> Anyone got a solution for good realistic neon lights? I am currently
>> trying
>
>
> I'm with everyone else:
>
> radiosity+emitting media.
>
> It seems your neons are torroidial, so use a torus function, something
> like:
>
> #declare neon_light =
> torus
> {
> 2, 0.1
>
> pigment { color rgbt 1 }
> finish { ambient 4.0 diffuse 0 reflection 0.5}
> hollow
> interior
> {
> media { emission rgb <1, 0.01, 0.001> *15
>
> density
> {
> function { f_torus(x,y,z,2,0.05)}
> }
> }
> }
>
> }
>
> The radiosity block I used:
>
> radiosity
> {
> pretrace_start 0.08
> pretrace_end 0.01
> low_error_factor .8
> count 100
> nearest_count 20
> recursion_limit 4
> error_bound 1
> brightness 1
> media on
> }
>
> I'll attached a file of what this will look like. Please excuse me if
> the object looks similar. I liked it and wanted to make it look the same
> (but makes a darn good demo-scene) :)
>
> Adjust the colors in any way you wish. I chose a more typical red for
> the neon.
>
--
~Mike
Things! Billions of them!
Post a reply to this message
Attachments:
Download 'neons.jpg' (9 KB)
Preview of image 'neons.jpg'
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Sorry, not paying enough attention to the image you are trying to make. Glow
would only really work for spheres or cylinders. Don't think it could be
used for torus (I guess you could loop lots of spheres as done in one of
the mega pov demo scenes.)
Sean
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Thanks for the replies.
I did manage to get a fake sorta glow using emitting media, but I still
can't get the tubes to emit light. The effect I want at this point is to
have no light in the scene and use the tubes to light up.
I will spend this weekend to get better results and post them when I have
something worth showing.
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Mike Raiford <mra### [at] hotmail com> wrote:
> I'll attached a file of what this will look like. Please excuse me if
> the object looks similar. I liked it and wanted to make it look the same
> (but makes a darn good demo-scene) :)
Glad you liked it and go ahead and use the idea ;) Love to see your end
result.
I couldn't wait until I got home so I started a new scene during my
lunchbreak at work. I have attached an example render which looks much more
promising than what I got earlier. I placed no lightsources in this scene
so the result is definately what I'm after.
And yes I know ... this sorta thing should be animated (on my to-do list)
LOL
I hope you like it and I will continue experimenting this weekend.
NumbC
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Attachments:
Download 'neon test 004.jpg' (68 KB)
Preview of image 'neon test 004.jpg'
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Here's one of three images of my tests since my last post.
Post a reply to this message
Attachments:
Download 'neon test 005b.jpg' (76 KB)
Preview of image 'neon test 005b.jpg'
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Here's the second one.
Post a reply to this message
Attachments:
Download 'neon test 005e.jpg' (79 KB)
Preview of image 'neon test 005e.jpg'
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And the third.
Post a reply to this message
Attachments:
Download 'neon test 005i.jpg' (58 KB)
Preview of image 'neon test 005i.jpg'
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