Degenerate Surfaces

Help on setting up the building geometry, including importing from BIM

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shopengarten
Posts: 2

Degenerate Surfaces

Postby shopengarten » Mon Jan 23, 2017 9:42 pm

Hi,

I keep coming across the same issue with degenerate surfaces in my model when I try to run a simulation.

** Warning ** GetSurfaceData: There are 2 coincident/collinear vertices; These have been deleted unless the deletion would bring the number of surface sides < 3.
** ~~~ ** For explicit details on each problem surface, use Output:Diagnostics,DisplayExtraWarnings;
** Severe ** GetSurfaceData: There are 1 degenerate surfaces; Degenerate surfaces are those with number of sides < 3.


I looked at the IDF file created by DesignBuilder and noticed that the vertices I export tend to have 8-9 decimal places making it nearly impossible for me to find the offending surface in my model.

! Brayton, Bathroom Zone 36, Roof - 633.73 ft2, Surface Area: 572.41ft2
BuildingSurface:Detailed, !- Surface
Brown:BathroomZone36_Roof_0_0_1, !- Surface name
Roof, Roof Attic & Other Steel Joists R-20 (3.5) U-0.056 (0.32), !- Class and Construction Name
Brown:BathroomZone36, !- Zone Name
Outdoors, , !- Outside Face Environment
SunExposed, !- Sun Exposure
WindExposed, !- Wind Exposure
AutoCalculate, !- View Factor to Ground
4, !- Number vertices
-239.39836015, 107.4306014933, 12.2086010202, !- Vertex 1
-231.13476723, 108.15357219, 12.2086010202, !- Vertex 2
-231.6935090299, 114.5400201059, 12.2086010202, !- Vertex 3
-239.9571019478, 113.8170494094, 12.2086010202; !- Vertex 4




Does anyone know a good trick to cleaning up the geometry in design builder or at least how to identify the offending surface? I have the model on "Simple Geometry" all, so it's somewhere in my geometry.

Thanks!

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