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manoweb nous apporta ses lumieres en ce 2005-05-30 05:03:
> Hi, I would like to create an animation to better explain what happens
> during an eclipse.
>
> My scene is:
> camera
> {
> orthographic
> location <25, 5, -50>
> look_at <25, 0, 0>
> }
>
> #declare sunlight =
> sphere
> {
> 0,10
> pigment { rgbf <1,1,1,1> }
> finish { specular 5 metallic}
> }
>
> light_source { 0 color rgb <1,1,0.6> looks_like { sunlight } }
>
> #declare earth =
> sphere
> {
> 0, 5
> pigment { ... }
> }
>
> I would like to "see" the shadow the earth casts on the direction opposite
> to the sun. I think that the correct "media" for the space could do the
> trick, showing a yellowish light on all the scene but a darker cone behind
> the earth. Until now I had no luck, the scene gets extremely white or like
> with no media; any advice on how I can achieve what I want?
>
> thank you
> Alessio Sangalli
>
>
>
>
>
Personaly, I won't use any media for that. What I would use ia a plane set to receive
the shadow.
Place it to cut the eart in half and place the sun in front of it. Change the sun for
an area_light
with circular orient adaptive 0 (1 if you want to show the shadow beyond the tip of
the full shadow
cone).
Alain
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