On 07/08/2018 15:33, Alain wrote:
> Le 18-08-07 à 06:33, Stephen a écrit :

>>
>> 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
>>
> 
> The 23, 23  get bumped up to 33, 33
> 
> adaptive 5 mean start at subdivision 5, or start with 33, 33 samples. 
> This effectively disable the adaptive optimization.
> In the present case, adaptive 0 is good.
> 
> adaptive 0 start at 2 by 2
> adaptive 1 start at 3 by 3
> adaptive 2 start at 5 by 5
> adaptive 3 start at 9 by 9
> adaptive 4 start at 17 by 17
> adaptive 5 start at 33 by 33
> adaptive 6 start at 65 by 65
> ....
> 
> You need a number of samples at least 2 step up to get some appreciable 
> benefit. For adaptive 0, use at least 5 by 5, and 9 by 9 or more in most 
> cases.
> For adaptive 1, better to start around 17 by 17.
> For adaptive 5, you start to see an improvement around 129 by 129...

Thanks Alain, I seldom use area lights and this is the first time I have 
used adaptive.
When you said samples is that what the offline help names Size_1 & 
Size_2, in the line;
AXIS_1_VECTOR, AXIS_2_VECTOR, Size_1, Size_2?

-- 

Regards
     Stephen

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