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I assume you are using the Output"Surfaces:Drawing object to have EnergyPlus generate a DXF file at run-time. The default behavior for Field Specification 1 field is "Trinagulate3DFace". You can change this to "ThickPolyline" or "RegularPolyline" and then the surfaces won't be triangulated.

This doesn't affect the simulation results, just the dxf file that is created along with the simulation results for visualization purposes. This EnergyPlus feature pre-dates the SketchUp plugin when modelers would inspect the dxf files generated by EnergyPlus.

I assume you are using the Output"Surfaces:Drawing EnergyPlus Output:Surfaces:Drawing object to have EnergyPlus generate a DXF file at run-time. The default behavior for Field Specification 1 field is "Trinagulate3DFace". You can change this to "ThickPolyline" or "RegularPolyline" and then the surfaces won't be triangulated.

This doesn't affect the simulation results, just the dxf file that is created along with the simulation results for visualization purposes. This EnergyPlus feature pre-dates the SketchUp plugin when modelers would inspect the dxf files generated by EnergyPlus.