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I'm trying to make an outdoor scene with a white object. I have a sky_sphere
that is basically a light blue. However, whenever I render with radiosity,
the object has a blue tint to it. Is there some way to keep the background
color without it affecting the rest of the scene? I can't seem to find it
in the doucmentation. Thanks
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"jhu" <nomail@nomail> wrote in message
news:web.444b9d653e18951ea842a49e0@news.povray.org...
> I'm trying to make an outdoor scene with a white object. I have a sky_sphere
> that is basically a light blue. However, whenever I render with radiosity,
> the object has a blue tint to it.
isn't that exactly the point of radiosity?
cu!
--
#macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
#end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
_(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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In some situations, yes. In real life, when you walk outdoors, things don't
have a blue tint. I'm trying to get that sense without having completely
dark shadows behind objects.
"Zeger Knaepen" <zeg### [at] povplace com> wrote:
> "jhu" <nomail@nomail> wrote in message
> news:web.444b9d653e18951ea842a49e0@news.povray.org...
> > I'm trying to make an outdoor scene with a white object. I have a sky_sphere
> > that is basically a light blue. However, whenever I render with radiosity,
> > the object has a blue tint to it.
>
> isn't that exactly the point of radiosity?
>
> cu!
> --
> #macro G(b,e)b+(e-b)*C/50#end#macro _(b,e,k,l)#local C=0;#while(C<50)
> sphere{G(b,e)+3*z.1pigment{rgb G(k,l)}finish{ambient 1}}#local C=C+1;
> #end#end _(y-x,y,x,x+y)_(y,-x-y,x+y,y)_(-x-y,-y,y,y+z)_(-y,y,y+z,x+y)
> _(0x+y.5+y/2x)_(0x-y.5+y/2x) // ZK http://www.povplace.com
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
jhu wrote:
> In some situations, yes. In real life, when you walk outdoors, things don't
> have a blue tint. I'm trying to get that sense without having completely
> dark shadows behind objects.
>
Actually, they do. However most of the times, when the sky is blue
enough for the effect to be visible, you've got the sun shining
yellow light on the scene which balances the blue. But if you look
closely at a pure white object in shadow, you should notice that it
has taken a blue cast.
Jerome
- --
+------------------------- Jerome M. BERGER ---------------------+
| mailto:jeb### [at] freefr | ICQ: 238062172 |
| http://jeberger.free.fr/ | Jabber: jeb### [at] jabberfr |
+---------------------------------+------------------------------+
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Version: GnuPG v1.4.2.2 (GNU/Linux)
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=fM1s
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jhu wrote:
> In some situations, yes. In real life, when you walk outdoors, things don't
> have a blue tint.
That's not right. The blue tint you observe would also occurs in real
life. The reason why you find it unnatural is that you designed the
scene (textures, lighting etc.) to look natural without radiosity and
expect it to look the same with it. This does not work.
You have the no_radiosity flag in MegaPOV to exclude certain objects
from radiosity calculation but this is just a artistic feature without a
physical background. If you want your render to look realistic you
should design the scene to look this way with radiosity and with sky.
Christoph
--
POV-Ray tutorials, include files, Landscape of the week:
http://www.imagico.de/ (Last updated 14 Mar. 2006)
MegaPOV with mechanics simulation: http://megapov.inetart.net/
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> I'm trying to make an outdoor scene with a white object. I have a
sky_sphere
> that is basically a light blue. However, whenever I render with radiosity,
> the object has a blue tint to it. Is there some way to keep the background
> color without it affecting the rest of the scene? I can't seem to find it
> in the doucmentation. Thanks
I'm thinking the gray_threshold in the radiosity-block was introduced for
just this.
But as others have already pointed out, the blue tint is actually realistic,
gray_threshold just takes the color out of the brightness.
Regards,
Tim
--
aka "Tim Nikias v2.0"
Homepage: <http://www.nolights.de>
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Ok, that did it. Thanks!
"Tim Nikias" <JUSTTHELOWERCASE:timISNOTnikias(at)gmx.netWARE> wrote:
> > I'm trying to make an outdoor scene with a white object. I have a
> sky_sphere
> > that is basically a light blue. However, whenever I render with radiosity,
> > the object has a blue tint to it. Is there some way to keep the background
> > color without it affecting the rest of the scene? I can't seem to find it
> > in the doucmentation. Thanks
>
> I'm thinking the gray_threshold in the radiosity-block was introduced for
> just this.
> But as others have already pointed out, the blue tint is actually realistic,
> gray_threshold just takes the color out of the brightness.
>
> Regards,
> Tim
>
> --
> aka "Tim Nikias v2.0"
> Homepage: <http://www.nolights.de>
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jhu <nomail@nomail> wrote:
> In real life, when you walk outdoors, things don't
> have a blue tint.
Would you call the blue tint in this image unrealistic, non-real-life-like?
http://warp.povusers.org/sponza.jpg
--
- Warp
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No, just that mine wasn't realistic
Warp <war### [at] tagpovrayorg> wrote:
> jhu <nomail@nomail> wrote:
> > In real life, when you walk outdoors, things don't
> > have a blue tint.
>
> Would you call the blue tint in this image unrealistic, non-real-life-like?
>
> http://warp.povusers.org/sponza.jpg
>
> --
> - Warp
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jhu <nomail@nomail> wrote:
> No, just that mine wasn't realistic
Your image was probably realistic if you had set up a real-life scene
which was identical to your modelled scene.
However, since your modelled scene was probably quite different from
what you usually see in real life, it was something unexpected, but not
unrealistic per se.
--
- Warp
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