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Hi all
Need a little help and advice if possible.
I'm creating a scene that uses ground fog, and I'm getting blue shadows
cast from my objects. This doesn't look right to me, but then again, I can't
say that I've ever seen a shadow in fog. I'm using one area_light with
colour rgb 0.6.
What would be the normal behaviour of light and then shadows in a fog
scene? What would be the best way to approach this, (as in, should there be
shadows at all, and what colour should they be if yes)?
~Steve~
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St. nous apporta ses lumieres en ce 17 / 05 / 2007 03:33:
> Hi all
>
> Need a little help and advice if possible.
>
> I'm creating a scene that uses ground fog, and I'm getting blue shadows
> cast from my objects. This doesn't look right to me, but then again, I can't
> say that I've ever seen a shadow in fog. I'm using one area_light with
> colour rgb 0.6.
>
> What would be the normal behaviour of light and then shadows in a fog
> scene? What would be the best way to approach this, (as in, should there be
> shadows at all, and what colour should they be if yes)?
>
> ~Steve~
>
If you look in the documentation, you'll see that fog don't interact with light.
How does your shadows look without the fog in your scene? Dou you use a blue
fill light? Is your fog coloured? All of those can make the shadows blue.
--
Alain
-------------------------------------------------
EVERYTHING HAS A GENDER
You may not know this but many nonliving things have a gender...
A Web Page is Female, because it's always getting hit on.
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"Alain" <ele### [at] netscape net> wrote in message
news:464c2896$1@news.povray.org...
> St. nous apporta ses lumieres en ce 17 / 05 / 2007 03:33:
> If you look in the documentation, you'll see that fog don't interact with
> light.
> How does your shadows look without the fog in your scene? Dou you use a
> blue fill light? Is your fog coloured? All of those can make the shadows
> blue.
I've posted a couple of examples in p.b.i Alain. The shadow without the
fog looks normal to me, (maybe too dark though), and I'm not using a fill
light. My fog colour is the same as my light colour, rgb 0.6. I'm just
wondering if it's to do with the height of my light, as it's only 70 units
high. Would it be better if I used something that more resembles the sun?
~Steve~
> --
> Alain
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>I'm just wondering if it's to do with the height of my light, as it's only
>70 units
> high.
Hmm, no, it's not the height, that just sharpens the shadow.
~Steve~
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St. wrote:
>> I'm just wondering if it's to do with the height of my light, as it's only
>> 70 units
>> high.
>
> Hmm, no, it's not the height, that just sharpens the shadow.
>
Is it possible to post a minimal scene that reproduces the blue
shadow..? I'm curious, now.
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"Mike Raiford" <mra### [at] hotmailcom> wrote in message
news:464c5ab1$1@news.povray.org...
> Is it possible to post a minimal scene that reproduces the blue shadow..?
> I'm curious, now.
I think it's my assumed_gamma Mike. I've just tried it with 2.2 which
makes the whole image too dark (but the shadow looks ok), and 1, and that's
better, but still too dark, (now with a darker blue shadow). At .75, the
overall image looks fine, (the right brightness, contrast, etc.), apart from
the blue shadow.
Hmm, what to do, what to do...
~Steve~
global_settings {
assumed_gamma .75 max_trace_level 60 }
fog {
fog_type 2
distance 75
colour rgb 0.6
fog_offset 0.005
fog_alt 0.2
turbulence 1
turb_depth .5
}
light_source {
0*x
colour rgb 0.6
area_light
<8, 0, 2> <2, 0, 8>
4, 4
adaptive 0
jitter
circular
translate <30, 70, -30>
}
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St. wrote:
> "Mike Raiford" <mra### [at] hotmailcom> wrote in message
> news:464c5ab1$1@news.povray.org...
>
>> Is it possible to post a minimal scene that reproduces the blue shadow..?
>> I'm curious, now.
>
> I think it's my assumed_gamma Mike. I've just tried it with 2.2 which
> makes the whole image too dark (but the shadow looks ok), and 1, and that's
> better, but still too dark, (now with a darker blue shadow). At .75, the
> overall image looks fine, (the right brightness, contrast, etc.), apart from
> the blue shadow.
>
> Hmm, what to do, what to do...
>
> ~Steve~
Hm. The code you included with this post doesn't exhibit much of
anything, just a gray fog with a darker gray background.
What version of POVRay are you using?
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"Mike Raiford" <mra### [at] hotmailcom> wrote in message
news:464c6ff6@news.povray.org...
> St. wrote:
>> "Mike Raiford" <mra### [at] hotmailcom> wrote in message
>> news:464c5ab1$1@news.povray.org...
> Hm. The code you included with this post doesn't exhibit much of anything,
> just a gray fog with a darker gray background.
That's all there is apart from Wings models and some PovTree's. As it is
now, the scene looks quite good and I'm happy with it, I'm just not getting
the assumed_gamma thing. It's confusing me because it should either be 2.2
or 1 (from what I've read). FWIW, nearly all of my images over the last two
years use a low assumed_gamma. Where am I going wrong with this?
>
> What version of POVRay are you using?
Yes, sorry, 3.5.
~Steve~
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Are you using radiosity? A blue sky
can tint the fog blue if you are using
radiosity.
What are the textures? Are any reflective?
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"Tim Attwood" <tim### [at] comcastnet> wrote in message
news:464d1426@news.povray.org...
> Are you using radiosity? A blue sky
> can tint the fog blue if you are using
> radiosity.
No radiosity and I've removed my sky_sphere - no difference.
>
> What are the textures? Are any reflective?
The textures are image maps with bump mapping and the only thing that's
reflective is a small model which I don't think would make a difference.
I've settled for having the assumed_gamma at 1.2, which makes the
scene/shadow better, but darker overall.
~Steve~
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