Le 2020-05-10 à 13:09, Cousin Ricky a écrit :
> On 2020-05-10 12:18 PM (-4), Alain Martel wrote:
>> Le 2020-05-09 à 19:59, Bald Eagle a écrit :
>>>
>>>>              //default light
>>>>              light_source {
>>>>                  cam_location
>>>>                  color White
>>>>                  area_light <100, 0, 0>, <0, 0, 100>, 10, 10
>>>>                  adaptive 1
>>>>                  jitter
>>>>              }
>>>
>>> That seems - excessive?  Especially for a simple render.
>>> And it might have something to do with the weird look.
>>> Just use a standard point light source, and you'll get adequate 
>>> lighting and
>>> good shadows.
>>
>> Yes, should use adaptive 0
> 
> That depends on the scene.  I've had some scenes for which adaptive 0 
> was fine, and others for which the result was hideous.
> 

You start with adaptive 0. If it's OK, good for you. Only if there are 
some glitches do you  ever need  to use adaptive 1 or more. You rarely 
ever need to go over adaptive 2.

Just remember at what values adaptive start :
adaptive 0 start with 2x2
adaptive 1 is 3x3
adaptive 2 is 5x5
adaptive 3 is 9x9
adaptive 4 is 17x17

You need to have at least two steps more than the starting value to get 
any notable performance improvement.

Also, that 10x10 get silently upgraded to 17x17.

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