On 17/12/2017 18:36, Kenneth wrote:
> 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.
> 
> 
> 
I made an animation of a negative spotlight sweeping over the Stamford 
bunny a while ago. Slightly unsettling.
I posted an example in p.b.i

-- 

Regards
     Stephen

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