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[EnergyPlus_Support] Warning: a Surface is non-convex.

Hi,

I have got this warning:

** Warning ** CheckConvexity: Zone="1STFLOFFICE9:CORRIDOR1STFL34", Surface="1STFLENTRANCE10%5:LOBBY1STFL3_WALL_3_0_4" is non-convex.
   **   ~~~   ** ...vertex 2 to vertex 3 to vertex 4
   **   ~~~   ** ...vertex 2=[22.66,4.20,0.30]
   **   ~~~   ** ...vertex 3=[22.66,4.20,0.00]
   **   ~~~   ** ...vertex 4=[24.45,4.20,0.00]

What does it mean that the surface is non-convex. 

Any idea of how to fix the warning?

Regards,

JC



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