Here's my picture of Mars. It's just a sphere with an image mapped on to 
it. Anyone know how I can get the atmosphere better? Thanks

David

#include "colors.inc"
#include "shapes.inc"
#include "finish.inc"
#include "glass.inc"
#include "metals.inc"
#include "stones.inc"
#include "woods.inc"

camera { 
        location <-1,4,10>
        look_at <0,2,2>
        }

light_source {
        <-1,0,20>
        colour <1,1,1>
}

sphere {
        <0,0,0>, 2
        pigment { 
                image_map {
                        tga "mars.tga"
                        map_type 1
                        once
                }
                rotate <-20,120,-20>
        }
        translate <0,2,2>
        finish { diffuse 1 }
}

sphere {
        <0,0,0>, 2.1
        pigment {
                color rgbt <1, 0.7, 0.7, 0.95>  
        }
        translate <0,2,2>
        finish { diffuse 5 }
}

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Attachments:
Download 'mars.jpg' (29 KB)

Preview of image 'mars.jpg'

David Findlay <dav### [at] yahoocomau> wrote in news:3c0842f4
@news.povray.org:

> Anyone know how I can get the atmosphere better?

Use a spherical media that's about 0.02% larger than the planet.  For extra 
realism use an exponential falloff function.

Things get much harder if you want clouds.  Multiple density is generally 
the best way to go.

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Planetary renders, as simple as they may seem are always very cool.  You can
achieve a realistic atmosphere using scattering media with a spherical
density (so the air thins the farther it gets from the planet).  Perhaps
something like this:

-- POV 3.5 source


sphere {
        <0,0,0>, 2.1
        pigment {
                color rgbt 1
        }

        interior {
        media {
                     scattering {2, <1, 0.7, 0.7>*1 extinction 1 }
        density  { spherical }
        }
        }
        translate <0,2,2>
        hollow
}


--
Skip


David Findlay <dav### [at] yahoocomau> wrote in message
news:3c0842f4@news.povray.org...
> Here's my picture of Mars. It's just a sphere with an image mapped on to
> it. Anyone know how I can get the atmosphere better? Thanks
>
> David
>
> #include "colors.inc"
> #include "shapes.inc"
> #include "finish.inc"
> #include "glass.inc"
> #include "metals.inc"
> #include "stones.inc"
> #include "woods.inc"
>
> camera

>         location <-1,4,10>
>         look_at <0,2,2>
>         }
>
> light_source {
>         <-1,0,20>
>         colour <1,1,1>
> }
>
> sphere {
>         <0,0,0>, 2
>         pigment

>                 image_map {
>                         tga "mars.tga"
>                         map_type 1
>                         once
>                 }
>                 rotate <-20,120,-20>
>         }
>         translate <0,2,2>
>         finish { diffuse 1 }
> }
>
> sphere {
>         <0,0,0>, 2.1
>         pigment {
>                 color rgbt <1, 0.7, 0.7, 0.95>
>         }
>         translate <0,2,2>
>         finish { diffuse 5 }
> }

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I *might* be wrong, but I think at this distance the atmosphere wouldn't
visibly extrude from the side of the planet. The atmosphere is already taken
into account in the image map. I don't think you really need to worry about
adding extra atmosphere.

- Slime
[ http://www.slimeland.com/ ]
[ http://www.slimeland.com/images/ ]

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