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Does anybody know of a good way to make a neon sign, especially one that
emits light?
Rohan _e_ii
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"Rohan Bernett" <rox### [at] yahoo com> wrote in
news:web.3d44abd7e694ad8fd02c7b870@news.povray.org
> Does anybody know of a good way to make a neon sign, especially one that
> emits light?
I suggest - glass, maybe media inside glass, and :
a) area_light x*10,y,10,1 to make line area lights
b) maybe use emitting media with radiosity to make madia realy emit light ?
c) use many light_sources placed inside each neone part i.e. in loop
--
#macro g(U,V)(.4*abs(sin(9*sqrt(pow(x-U,2)+pow(y-V,2))))*pow(1-min(1,(sqrt(
pow(x-U,2)+pow(y-V,2))*.3)),2)+.9)#end#macro p(c)#if(c>1)#local l=mod(c,100
);g(2*div(l,10)-8,2*mod(l,10)-8)*p(div(c,100))#else 1#end#end light_source{
y 2}sphere{z*20 9pigment{function{p(26252423)*p(36455644)*p(66656463)}}}//M
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On 28 Jul 2002 23:07:45 -0400, "Rafal 'Raf256' Maj" <raf### [at] raf256com>
wrote:
>I suggest - glass, maybe media inside glass, and :
>a) area_light x*10,y,10,1 to make line area lights
c) is better, as area lights only behave as expected when it comes to
shadows.
>b) maybe use emitting media with radiosity to make madia realy emit light ?
This could prove to be slow...
>c) use many light_sources placed inside each neone part i.e. in loop
Probably the best solution, yes. Especially when you add emitting
media to fake the glow.
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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In article <ldt9kucftabnsnkp0b42rakvg6ihq508ro@4ax.com>,
Peter Popov <pet### [at] vipbg> wrote:
> >b) maybe use emitting media with radiosity to make madia realy emit light ?
>
> This could prove to be slow...
A texture with a high ambient and maybe some transparency would be
faster.
--
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/
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On Sun, 28 Jul 2002 22:43:35 EDT, Rohan Bernett wrote:
> Does anybody know of a good way to make a neon sign, especially one that
> emits light?
I can't help with the "emits light" part but try my signature for the rest.
--
#macro R(L P)sphere{L F}cylinder{L P F}#end#macro P(V)merge{R(z+a z)R(-z a-z)R(a
-z-z-z a+z)torus{1F clipped_by{plane{a 0}}}translate V}#end#macro Z(a F T)merge{
P(z+a)P(z-a)R(-z-z-x a)pigment{rgbt 1}hollow interior{media{emission T}}finish{
reflection.1}}#end Z(-x-x.2y)Z(-x-x.4x)camera{location z*-10rotate x*90}
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On Mon, 29 Jul 2002 09:19:35 -0500, Christopher James Huff wrote:
> In article <ldt9kucftabnsnkp0b42rakvg6ihq508ro@4ax.com>,
> Peter Popov <pet### [at] vipbg> wrote:
>
>> >b) maybe use emitting media with radiosity to make madia realy emit
>> >light ?
>>
>> This could prove to be slow...
>
> A texture with a high ambient and maybe some transparency would be
> faster.
I tried to do this recently, and didn't have very good luck. The neon
tube itself looks okay (not great) with a high ambient, but it doesn't do
as much as you'd expect for illumination. Maybe my radiosity settings
weren't too good, but even with a count of 500 and an ambient as high as
10000, it was far from convincing.
Similar results with emitting media in a clear object.
I also never came up with a good way to control the density of the media
so that it would be highest along the central axis of the tube and fall
off toward the outside like a real neon tube. (The tube was a complex
curve made with a sphere sweep).
-Ed
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On Wed, 31 Jul 2002 09:17:52 -0500, Ed Jackson <eja### [at] iastateedu>
wrote:
>I tried to do this recently, and didn't have very good luck. The neon
>tube itself looks okay (not great) with a high ambient, but it doesn't do
>as much as you'd expect for illumination. Maybe my radiosity settings
>weren't too good, but even with a count of 500 and an ambient as high as
>10000, it was far from convincing.
Did you adjust max_sample accordingly?
Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG e-mail : pet### [at] tagpovrayorg
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On Wed, 31 Jul 2002 18:21:37 -0500, Peter Popov wrote:
>>I tried to do this recently, and didn't have very good luck. The neon
>>tube itself looks okay (not great) with a high ambient, but it doesn't
>>do as much as you'd expect for illumination. Maybe my radiosity
>>settings weren't too good, but even with a count of 500 and an ambient
>>as high as 10000, it was far from convincing.
>
> Did you adjust max_sample accordingly?
>
Actually, I gave up and moved on to other things. I might go back to it
eventually. However, I just had it up against a wall, and it didn't even
illuminate the wall convincingly. *shrug* I guess I just need to play
with it some more.
-Ed
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