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Is it possible with Pov-Ray to simulate a moonlit scene realisticly? The
moon should reflect the sun's light on earth with resulting shadows on
earth.
--
-Nekar Xenos
"The truth is out there"
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Nekar wrote:
> Is it possible with Pov-Ray to simulate a moonlit scene realisticly? The
> moon should reflect the sun's light on earth with resulting shadows on
> earth.
>
>
Nekar, I'm no lighting expert, but from what I have observed, the moon
produces sharp edged shadows like the sun (although the contrast is low
because the light is so dim). The remaining light is that blue light
you get scattered from the atmosphere. My suggestion would be to use a
dim point light aligned with the position of the moon and a dark blue
sky_sphere with radiosity.
If you are trying to render a space scene, however, I would put a point
light inside the moon and use light groups to control the illumination
of the scene. The sun would illuminate the moon, but the point light
inside would be the actual light emitter from the moon.
The most realistic approach would be using radiosity with probably set
texture finishes for the moon/sun/earth. Then the light from the moon
would actually be reflected from the sun. But computing pure radiosity
from such widely spaced points sounds like its asking for trouble.
Skip
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"Skip Talbot" <Ski### [at] aol com> wrote in message
news:451016ab$1@news.povray.org...
> Nekar wrote:
>> Is it possible with Pov-Ray to simulate a moonlit scene realisticly? The
>> moon should reflect the sun's light on earth with resulting shadows on
>> earth.
>>
>>
> The most realistic approach would be using radiosity with probably set
> texture finishes for the moon/sun/earth. Then the light from the moon would
> actually be reflected from the sun. But computing pure radiosity from such
> widely spaced points sounds like its asking for trouble.
>
> Skip
Looks like I was asking for trouble...
I was thinking photons from the sun and radiosity and a sphere with variable
reflection and a very small shallow granite normal...
Still, it might be fun to just scale the moon smaller and bring it closer to
earth so that it still looks the same size, have an area spotlight with photons
shine onto the moon and see what happens...
--
-Nekar Xenos-
----------------------------------------
"The truth is out there..."
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Nekar <ger### [at] rpmmagcoza> wrote:
> Is it possible with Pov-Ray to simulate a moonlit scene realisticly? The
> moon should reflect the sun's light on earth with resulting shadows on
> earth.
Just use a light source on the moon?
--
- Warp
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Skip Talbot <Ski### [at] aolcom> wrote:
> the moon
> produces sharp edged shadows like the sun
Perhaps you should go out some day and actually observe shadows
produced by the Sun? ;)
Hint: Is the Sun a point light? Do you see it in the sky as a tiny
little bright point?
--
- Warp
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Nekar nous apporta ses lumieres en ce 19/09/2006 01:50:
> Is it possible with Pov-Ray to simulate a moonlit scene realisticly? The
> moon should reflect the sun's light on earth with resulting shadows on
> earth.
>
>
Use a parallel and area_light with circular centered at the moon's location. The
light's dimention been similar to the visual dimention of the moon. Keep the
intensity low, it's the moon after all. It's colour should be white or silvery
white. Use a dark blue sky_sphere or world sphere and radiosity or a faint blue
fill light to cast a bluish tint on your scene.
--
Alain
-------------------------------------------------
Don't waste your time on a man/woman, who isn't
willing to waste their time on you.
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Warp wrote:
> Skip Talbot <Ski### [at] aolcom> wrote:
>> the moon
>> produces sharp edged shadows like the sun
>
> Perhaps you should go out some day and actually observe shadows
> produced by the Sun? ;)
>
> Hint: Is the Sun a point light? Do you see it in the sky as a tiny
> little bright point?
>
Well, its close enough that I would still use a point light.
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Skip Talbot <Ski### [at] aolcom> wrote:
> Well, its close enough that I would still use a point light.
If you actually watch shadows of objects distant to the ground in
a sunny day, it's not very "close enough".
It's just that "sunlight shadows are sharp" is wrong.
--
- Warp
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Alain <ele### [at] netscapenet> wrote:
> Use a parallel and area_light
Doesn't parallel kind of nullify the effect of area_light? (Well,
I haven't tested how POV-Ray behaves exactly in this case, but at
least at the idea level.)
--
- Warp
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Warp nous apporta ses lumieres en ce 20/09/2006 07:36:
> Alain <ele### [at] netscapenet> wrote:
>> Use a parallel and area_light
>
> Doesn't parallel kind of nullify the effect of area_light? (Well,
> I haven't tested how POV-Ray behaves exactly in this case, but at
> least at the idea level.)
>
Not acording to the documentations. The parallel light still is at a finite
distance, making the use of area_light possible without the need to use
ridiculously large dimentions.
--
Alain
-------------------------------------------------
Commercialism: Let's package this shit.
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