On 26/11/2014 18:54, Ive wrote:
> Am 26.11.2014 14:12, schrieb Stephen:
>> ... I was hoping that someone had devised a way to use the
>> greyscale value.
>>
>
>
Thanks, I posted an update in p.b.i in Thomas's thread.

> #declare PP_Claud = pigment{image_map{jpeg "my_cloud_map" map_type 1
> interpolate 2}}
>
>   sphere{ 0, 1.005
>     texture {
>       pigment_pattern{PP_Claud}
>       texture_map {
>        [0.00 texture {pigment{rgb 1 transmit 1} finish{diffuse 1}}]
>        [1.00 texture {pigment{rgb 1 transmit 0} finish{diffuse 1}}]
>       }
>     }
>   }
>
> ....where "my_cloud_map" is a grayscale, not a color palette image!
>
> and it might be a good idea to add the cloud texture to a slightly
> larger scaled sphere (than the planet) and not as top layered texture as
> you did.

Yes that is better.

> And you didn't ask for it but anyway: adding a specular map in pretty
> much the same way (giving highlights to the ocean covered area but not
> to the land mass) makes it even more realistic.

What do you know, it makes quite an improvement. The Greek Isles look 
very attractive at this time of year.


> With some scattering media atmosphere it gives something like this:
> http://news.povray.org/povray.binaries.images/thread/<4a056976@news.povray.org>
>
>
I don't want it to look that good. :-)


-- 

Regards
     Stephen

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