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"ingo" <ing### [at] tag povrayorg> schreef in bericht
news:Xns963CAA07F35Eseed7@news.povray.org...
> in news:4263549c@news.povray.org Thomas de Groot wrote:
>
> > As always, comments are welcome.
> >
>
> Thomas,
>
> To what gamma did you render the image? It looks very flat here, the
> darkest tone is in the range of rgb 0.2
>
> Ingo
There is a marked difference between the aspect of the image in the mail
(here it is correctly contrasted) and when viewed (indeed) in PaintShopPro
where it is more washed out. I decreased gamma there to 0.76 and obtained a
satisfying (and similar) tone.
Thomas
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"Slime" <fak### [at] emailaddress> schreef in bericht
news:4264b858@news.povray.org...
> I think this is a really good scene, but the left half of it is lit almost
> completely by ambient lighting and doesn't look so good in my opinion.
With
> all those leaves radiosity might be out of the question, but you might
> experiment with shadowless lights.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
Thank you indeed.
Now, you point to something very puzzling and I was waiting for somebody to
point this out. The fact is that there is no ambient lighting "used" there,
at the left, and I am wondering where it comes from. Not from the rock
texturing (no finish); I had also a shadowless light, then commented it out
because I had the impression that it made things worse. Could there be some
freak reflection? I suppose not, though...
Thomas
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Got it!!
Being used to Moray, where I always set the ambient_light in the
global_settings to 0 (or a very low value), I forgot that in POV the default
of ambient_light is 1 :-(
No puzzle left! I shall provide a better image!!
Thanks for making me think again!
Thomas
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"Thomas de Groot" <t.d### [at] internlnet> wrote in message
news:4264c181@news.povray.org...
> Got it!!
>
> Being used to Moray, where I always set the ambient_light in the
> global_settings to 0 (or a very low value), I forgot that in POV the
default
> of ambient_light is 1 :-(
The default for ambient in Pov is 0.1. Still a little too high for my
liking, I usually put
#default {finish {ambient 0.02}} at the top of every file, but certainly not
that high.
Gail
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> >I forgot that in POV the default
> > of ambient_light is 1 :-(
>
> The default for ambient in Pov is 0.1.
Just to avoid confusion, POV-Ray has two values for ambient light: the first
is the global value, specified in global_settings, that is a multiplier for
all ambient light in the scene. This is 1 by default and you might want to
change it if, say, you wanted the scene to have colored ambient lighting.
The second value is per-object and specified in the finish block. The
default for this one is 0.1.
Although all ambient lighting can be turned off with global_settings
{ambient_light 0}, the best way to do this is with #default{finish{ambient
0}} as this can be overriden for a specific object.
- Slime
[ http://www.slimeland.com/ ]
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From: Thomas de Groot
Subject: Re: The look-out - corrected for ambient lighting
Date: 20 Apr 2005 03:00:00
Message: <4265fdf0@news.povray.org>
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I put ambient_light in the general settings to 0.1 in this new scene
version, and added a shadowless light to highlight somewhat the cliff's
shadows. Much better in my opinion.
What do you think?
Thomas
Post a reply to this message
Attachments:
Download 'El Barranco_05_the look-out.jpg' (93 KB)
Preview of image 'El Barranco_05_the look-out.jpg'
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news:426562ec$1@news.povray.org...
> Although all ambient lighting can be turned off with global_settings
> {ambient_light 0}, the best way to do this is with #default{finish{ambient
> 0}} as this can be overriden for a specific object.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
This is very usefull for radiosity lighting when you want some objects to
emit light and the others not.
Marc
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> I put ambient_light in the general settings to 0.1 in this new scene
> version, and added a shadowless light to highlight somewhat the cliff's
> shadows. Much better in my opinion.
>
> What do you think?
Definitely a big improvement!
- Slime
[ http://www.slimeland.com/ ]
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"Gail Shaw" <gsh### [at] sentechsacom> schreef in bericht
news:42655444@news.povray.org...
>
> The default for ambient in Pov is 0.1. Still a little too high for my
> liking, I usually put
> #default {finish {ambient 0.02}} at the top of every file, but certainly
not
> that high.
>
> Gail
>
>
Well, thanks for reminding me that the finish ambient default was 0.1. I had
indeed forgotten that too!!
Thomas
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