Christopher James Huff nous apporta ses lumieres ainsi en ce 2004/05/12 
17:05... :

>In article <40a28795$1@news.povray.org>,
> "Tim Nikias v2.0" <#macro timnikias (@) #local = "gmx.net" #end> 
> wrote:
>
>  
>
>>>If the only light in your scene is the "sun" then maybe only the back of
>>>      
>>>
>>the
>>    
>>
>>>clouds are recieving light. You could try to add lights between the ground
>>>and the clouds, to illuminate the visible parts of the clouds
>>>      
>>>
>>Or use double_illuminate, so that both sides of a surface are lit.
>>    
>>
>
>Both of these will cause additional shading effects due to the angle of 
>incidence of the light rays varying over the surface of the sphere. The 
>correct solution is to use ambient 1 and diffuse 0 in the finish, as 

>lighting.
>
>  
>
Using that technique, don't forget to put the main light *far* outside 
the big sphere. If you don't, the shadows will get blown up to gigantic 
proportions. Placing the main light around 10 times the sphere radius 
should give you fair results, as well as using parallel light.

Alain

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