On 7-8-2018 12:51, clipka wrote:
> Am 07.08.2018 um 12:33 schrieb Stephen:
> 
>> A close up of the terminator on the Ringworld.
>> The area light does make a difference.
>> Using
>>   light_source {  // Light_Source2
>>    < 0.000000, 0.000000, 0.000000 >, colour rgb <1.000,1.000,1.000>*1.500
>>    area_light <3.400000,0.000000,0.000000>, <0.000000,3.400000,0.000000>,
>> 23, 23
>>
>>    circular
>>    orient
>>    adaptive 5
> 
> And it better does. You don't want the light to blink off
> instantaneously - you do want some twilight time.
> 

I agree. What I meant earlier was that, with the camera at /planetary/ 
distances from the ring, the penumbra would hardly be visible. Up close, 
and more so on the ring surface, of course the penumbra matters. 
However, if the area_light is set while the camera is at a /planetary/ 
distance, it will most probably be grossly exaggerated because otherwise 
you would not be able to see it properly in a render.

-- 
Thomas

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