Am 18.12.2013 02:17, schrieb clipka:
> Am 18.12.2013 01:27, schrieb David Given:
>> I'm experimenting with clouds. The attached image demonstrates. (The
>> view under the clouds is looking north along the western shore of the
>> Sea of Smyth, on the eastern edge of the moon --- the big crater is
>> probably Napier. The camera is 200km up.)
>>
>> The clouds are implemented as a textured sphere 35km above the surface.
>> The cirrus texture on the sphere is adequate, but I can fix that. The
>> thing I'm worried about is the dark edge on the horizon.
>>
>> I know what this is: my sphere is defined as:
>
> No, I'm pretty sure that isn't the reason; this must be something
> different.

Tests with a simple sample scene show that I was wrong as well: The 
"hollow" keyword does essentially work as you expected. Instead, the 
problem is somehow related to the way the media is sampled. Severely 
cranking up the number of samples reduces the effect to invisibility.

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