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eric wrote:
>
> I'm currently trying to render a in-house scene, and so, I need to simulate
> a white ceiling.
> But when I try to specify a white texture, I always get a gray ceiling, even
> when there is a light veryclose to it.
>
> Could you give me some hints about this difficulty ?
>
> I tried to play with ambiant, diffuse, etc.. but no effect seems OK..
>
> Thnaks for your help.
Can you post the texture statement that you are using along with finish
and the type of light source you are using. This will help us narrow things
down for you.
Hint: you can use values larger that 1 in your pigment statements i.e.
pigment { rgb 1 } // standard white
is not as intense as
pigment { rgb 2 } // intense white
--
Ken Tyler
See my 700+ Povray and 3D Rendering and Raytracing Links at:
http://home.pacbell.net/tylereng/index.html
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To save some typing I would just use pigment {rgb 2...3...etc.}.
--
Anthony L. Bennett
http://welcome.to/TonyB
Non nova, sed nove.
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Phil Clute wrote:
Both contestants posted at 12:35 so the judges score this round a tie :)
--
Ken Tyler
See my 700+ Povray and 3D Rendering and Raytracing Links at:
http://home.pacbell.net/tylereng/index.html
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Ken wrote:
>Both contestants posted at 12:35 so the judges score this round a tie :)
Damn! I didn't really need to add the last line either. :)
--
...coffee?...yes please! extra sugar,extra cream...Thank you.
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eric wrote:
>
> I'm currently trying to render a in-house scene, and so, I need to simulate
> a white ceiling.
> But when I try to specify a white texture, I always get a gray ceiling, even
> when there is a light veryclose to it.
>
> Could you give me some hints about this difficulty ?
>
> I tried to play with ambiant, diffuse, etc.. but no effect seems OK..
>
> Thnaks for your help.
The amount of lighting you get on a surface is determined by the
pigment, the lights visible from the surface and the angle at which the
light hits the surface.
Because the lights are usually high up near the ceiling, the angle will
be quite acute, causing the ceiling to appear dark.
One way to get around this is to use a low value for brilliance in your
finish. In the extreme case, if you use zero for the brilliance, the
angle will have no effect at all, and the surface will be fully
illuminated.
Try something around 0.1 - 0.5 for starters.
Cheers, PoD.
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One way to get more realistic lighting is, of course, radiosity (but
expect problems using it). For some hints:
http://www.students.tut.fi/~warp/pics/Radiosity_test2/
--
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):5;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/
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> I'm currently trying to render a in-house scene, and so, I need to simulate
> a white ceiling.
> But when I try to specify a white texture, I always get a gray ceiling, even
> when there is a light veryclose to it.
>
> Could you give me some hints about this difficulty ?
>
> I tried to play with ambiant, diffuse, etc.. but no effect seems OK..
Try finish {diffuse 1 brillance .1}
Diffuse just ups the brightness caused by lights. Brilliance control the
falloff of your diffuse lighting. The lower it gets, the larger the diffuse
'area'.
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>I'm currently trying to render a in-house scene, and so, I need to simulate
>a white ceiling.
>But when I try to specify a white texture, I always get a gray ceiling,
even
>when there is a light veryclose to it.
>
>Could you give me some hints about this difficulty ?
>
>I tried to play with ambiant, diffuse, etc.. but no effect seems OK..
>
>Thnaks for your help.
Try placing the light source as far from the object, as possible
(inside the room of course). I don't know if you'll get satisfying
result, but in my scenes textures looked brighter.
--
Wojtek Bauman aka reaver | rea### [at] spleen wawpl | ICQ: 3429749 |
http://reaver.spleen.waw.pl | PGP: finger bauman@inx.pm.waw.pl |
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Thank you all for your help and advice.. I'm new to POVRay (and raytracing,
actually..), and it's not always easy to understand tuning...
Anyway, I tried the various tricks you all gave me, and, finally, I have the
feeling that the most realsitic, in my case, was to put a multiplier on
colors statements (like 'rgb 2').
I appreciate your help and look forward being able to help you, too.
:o)
Eric
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I consistently use a rgb 1.5 light as the main starting point since a
rgb 1 plane, with default finish, which is perpendicular to both light
and camera will show this "white" plane as very nearly white indeed,
otherwise it would be gray. There's my logic.
Bob
eric <ski### [at] hotmailcom> wrote in message
news:37bb15e7@news.povray.org...
> Thank you all for your help and advice.. I'm new to POVRay (and
raytracing,
> actually..), and it's not always easy to understand tuning...
>
> Anyway, I tried the various tricks you all gave me, and, finally, I
have the
> feeling that the most realsitic, in my case, was to put a multiplier
on
> colors statements (like 'rgb 2').
>
> I appreciate your help and look forward being able to help you, too.
> :o)
>
> Eric
>
>
>
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