Le 17-12-17 à 13:36, Kenneth a écrit :
> clipka <ano### [at] anonymousorg> wrote:
> 
>>
>> To limit the light to, say, between 40 to 50 degrees, you could create a
>> spotlight with a 50 degree angle, and another spotlight with a 40 degree
>> angle and /negative/ brightness.
>>
> 
> That's an interesting concept: 'negative' light, to subtract from another light.
> Such an idea never occured to me, one worth checking out; thanks.
> 
> 
> 
There is at least one sample scene that use a negative light. Look at 
crater_dat.pov in /scenes/advanced/crater

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