>> I have a vague feeling that "adaptive" only works properly for a power 
>> of two - anyone confirm/deny?
>>
> It's power of 2 PLUS 1 for optimum subdivisions. Adaptive 0 start at 
> 2*2, adaptive 1 at 3*3, adaptive 2 at 5*5, adaptive 3 at 9*9, adaptive 4 
> at 17*17...
> You should start at adaptive 0 and increase if you get artefacts.

Right. Glad we cleared that up...

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