Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The "up" direction for the hemisphere orients the coordinate system. In this case, setting "up" to +Y is the same as "north" by gensky conventions. You can of course define it in another way, but other parts of your calculation will then have to change, such as the way you use genskyvec. The number of samples will be distributed the same whatever you choose for "+Y" as their density is radially symmetric (or nearly so) for all hemisphere types.
I hope this helps.
