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[EnergyPlus_Support] How to determine the "upper-left" corner of a horizontal surface?



When using "surface" to create a building model, EP requires the input of the coordinates of each corner.  The rule is such that you start from the "upper-left" corner and proceed counter-clockwise.  For vertical surfaces like walls, you determine the upper-left corner by standing in front of the surface and look "into" the zone.  This way, the "upper-left" corner is clearly defined.

However, I am a little confused by using this rule on a horizonal surface, say a roof or a slab.  Just looking "into" the zone is not enough to determine the "upper-left" corner because you can rotate to North, South, East, or West.

I would surely appreciate if you can kindly answer my question.

Have a good day!



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