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Hi Herman!
Let me guess what you're after:
1) A lightsource at the camera position. That's not a beautiful light, but
it's easy because anything you have in the cameras view will always be lit.
2) A general technique called three-point-light, used to enhance objects 3d
proportions. The basic idea is simple. But it's an interesting topics and
there is an excellent, detailed explanation here:
http://www.cybercollege.com/tvp031.htm
http://www.cybercollege.com/tvp032.htm
http://www.cybercollege.com/tvp033.htm
http://www.cybercollege.com/tvp034.htm
There seems to be more chapters at the above page, that you can access if
you like.
Best Regards,
Hugo
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In article <MPG.199d670bbcc1d94f989687@news.povray.org>,
HermanS <her### [at] pandora beinvalid> wrote:
> I'm using Povray mostly to represent mathematically defined objects
> (images and animations). In many cases I have a lot of trouble to place
> light sources in an adequate way.
> Is there a method for placing light sources in a rather general way or
> to use ambient light or radiosity to obtain a first idea of the
> raytraced objects?
Put this line at the beginning of the scene:
#default {finish {ambient 0 diffuse 1}}
And now put a dim, shadowless light at the camera location. Instead of
dim, flat, directionless ambient lighting, you are now using a fill
light. This will help contrast and shading a great deal...without this
camera light, you can easily end up with areas with no direct lighting,
and without radiosity they will look very flat. Finally, if I'm trying
to show off a single object instead of lighting a scene, I generally put
a bright light to the upper left rear, and a dimmer light either or both
to the right and behind the object.
For realistic lighting, you need radiosity, which will simulate light
coming to a point indirectly by bouncing off other surfaces. With
radiosity, you can reduce or eliminate the fill light. It takes more
adjustment though, and isn't necessary for a mathematical plot.
--
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/
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