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=?ISO-8859-1?Q?=22J=E9r=F4me_M=2E_Berger=22?= <jeb### [at] free fr> wrote:
> I'd be really interested to see such a scene if you could make one,
> but you can't (unless you use the "no_reflection" keyword of
> course).
global_settings {
ambient_light 0
radiosity { brightness 1.2 }
}
union {
plane { y, -1 pigment { rgb 1 } finish { ambient 6 } }
sphere { -x, 1 pigment { rgb x } }
sphere { x, 1 pigment { rgb y } finish { reflection 1 }}
translate z*5
}
I can't see a thing. Reflections or otherwise.
> I have made some test scenes with pure ambient lighting
> (neither light sources nor radiosity) and reflective materials and
> the reflections showed just fine.
yes, but you know ambient light is by itself faking a constant ambient lighting,
don't you? That's the hidden light by which povray is tracing the scene. No
lights, no reflection, nor image. nothing...
Let there be light! :)
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> I can't see a thing. Reflections or otherwise.
>
>> I have made some test scenes with pure ambient lighting
>> (neither light sources nor radiosity) and reflective materials and
>> the reflections showed just fine.
>
> yes, but you know ambient light is by itself faking a constant ambient lighting,
> don't you? That's the hidden light by which povray is tracing the scene. No
> lights, no reflection, nor image. nothing...
>
> Let there be light! :)
>
>
>
You were talkang about light sources. Ambient light has no source.
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nemesis <nam### [at] gmailcom> wrote:
> Alain <ele### [at] netscapenet> wrote:
> > You can always see an object with a high ambient value in a reflection without
> > any light.
> oh! but that *is* a bug! :P
Why?
--
- Warp
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Jan Dvorak <jan### [at] centrumcz> wrote:
> You were talkang about light sources. Ambient light has no source.
true. But the point is: a raytracer works by tracing light rays. If there's
no light, there's no image.
I'm guessing that when povray sees at least ambient light enabled, it traces the
image by shooting light rays to get the basic image with the shadow areas
illuminated by constant color. I may be wrong. In any case, I don't think we
can get an image out of povray without tracing rays around. Radiosity and
photons are addons to the basic raytracing rendering framework...
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Warp <war### [at] tagpovrayorg> wrote:
> nemesis <nam### [at] gmailcom> wrote:
> > Alain <ele### [at] netscapenet> wrote:
> > > You can always see an object with a high ambient value in a reflection without
> > > any light.
>
> > oh! but that *is* a bug! :P
>
> Why?
>
> --
> - Warp
because reflections without lights don't quite sound right...
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nemesis <nam### [at] gmailcom> wrote:
> because reflections without lights don't quite sound right...
A "light source" in POV-Ray terms is a "light_source" definition.
Surfaces (and media) can have non-black coloring even without any
light_source definitions.
--
- Warp
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Warp <war### [at] tagpovrayorg> wrote:
> nemesis <nam### [at] gmailcom> wrote:
> > because reflections without lights don't quite sound right...
>
> A "light source" in POV-Ray terms is a "light_source" definition.
> Surfaces (and media) can have non-black coloring even without any
> light_source definitions.
ok, and how do you explain the reflections?
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nemesis <nam### [at] gmailcom> wrote:
> > Surfaces (and media) can have non-black coloring even without any
> > light_source definitions.
> ok, and how do you explain the reflections?
Well, if a surface has a non-black coloring even without light sources,
it's obviously going to reflect from reflective surfaces.
--
- Warp
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Warp <war### [at] tagpovrayorg> wrote:
> nemesis <nam### [at] gmailcom> wrote:
> > > Surfaces (and media) can have non-black coloring even without any
> > > light_source definitions.
>
> > ok, and how do you explain the reflections?
>
> Well, if a surface has a non-black coloring even without light sources,
> it's obviously going to reflect from reflective surfaces.
come on, warp, you know that's not the answer I want.
How is povray rendering those reflections?
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> Warp <war### [at] tagpovrayorg> wrote:
>> nemesis <nam### [at] gmailcom> wrote:
>>>> Surfaces (and media) can have non-black coloring even without any
>>>> light_source definitions.
>>> ok, and how do you explain the reflections?
>> Well, if a surface has a non-black coloring even without light sources,
>> it's obviously going to reflect from reflective surfaces.
>
> come on, warp, you know that's not the answer I want.
>
> How is povray rendering those reflections?
>
If an object has a non-zero ambient, it doesn't need a lightsource to be
visible.
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