"elegac" <e.l### [at] voilafr> wrote in message 
news:web.43b816026526bd51c89ad05e0@news.povray.org...
>
> FIRST PROBLEM:What shoud I put in the finish{} properties of
> "planet_texture" to have a good-looking (is that the word) planet?

A specular hilight would be something to add for the sunlight to be seen 
reflected. Mostly for the water, but also a little for land. Something maybe 
like:  specular 0.05 roughness 0.1
You might need to adjust the amount (size) showing for the distance your 
camera is planned to be located from the planet surface. There's an effect 
called heiligenschein, or holy light, like a halo created on dewey grass 
around the shadow of your head but I'm not sure if this is the same thing.

> SECOND PROBLEM:
> I would like the landmass and the oceans to have different finish{}
> properties so that only the ocean reflects well the sun.

The black and white landmass/water map can be used in a material_map, then 
applied as the uppermost layer of textures over the other image_map texture 
but using transparent pigments to still see the other map through it. 
Something like this:

#declare Planet_Land_Texture=
texture {
    pigment {
     image_map {
      jpeg "earthmap.jpg"
         map_type 1 // spherical
         interpolate 2 // pixel blending
     }
    }
    finish {
        ambient 0
        diffuse 0.5
        specular 0.05 roughness 0.1
    }
}

#declare Planet_Water_Texture=
texture {
    material_map {
        png "earthlandwatermap.png"
        map_type 1
        interpolate 2
        texture { // first color index (black)
            pigment {
                rgbt 1 // clear
            }
        }
        // add textures between, if any more index values exist
        texture { // next color index (white?)
            pigment {
                rgbt 1
            }
            normal { // makes water unsmooth
                wrinkles 0.1 scale 0.01
            }
            finish {
                ambient 0
                diffuse 0
                specular 0.4 roughness 0.02
            }
        }
    }
}

sphere {
 0,1
  texture {Planet_Land_Texture}
}
// cannot layer the material texture into 1st so 2nd sphere is needed
sphere {
 0,1.0001 // slightly larger to cover other sphere
  texture {Planet_Water_Texture}
}

camera {
 location -3*z
 look_at 0
}

light_source {
 -123*z, 1
 rotate <30,30,0>
}
// looks like this should work okay with the image files you told of (I 
renamed them).

You might also want to try adding a normal{bump_map{[image file here]}} to 
the land part by using an elevation-based map, unless you'll only see the 
planet from far away.

Good luck with it! Ask more questions if you need any help. Someone else 
might even have other ideas for you.

Bob

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