[Radiance-general] gensky result different from that in, Axel's tutorial

[Axel Jacobs]

Hi Ji Zhang

 > So, Which output is the correct one? What might causes the
 > differences?

The Radiance Tutorial must be about ten years old now. I keep updating 
it, fixing small typos and inconsistencies, but have not felt the need 
to reflect the recent changes to gensky's turbidity.

Both, CIE clear and overcast are extremes that are fairly unlikely to 
occur in reality. As Greg said, you really need to feed in measurements, 
and also have a good guess at the turbidity if you are concerned about 
accuracy. If you can supply diffuse and direct irradiation, you might 
want to use gendaylit instead.

Axel