Too many figures in a Shading Overlap

asked 2019-01-03 09:51:40 -0500

taher.ahel's avatar

updated 2019-01-03 12:38:30 -0500

I've read these links.

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I have some shading surface that theirs transparency change over a day. it means one of surfaces has 100% transparency and the rest have 0%, and the surface transparency changes one by one during such as figure below.

Everything is ok and I wrote the ems codes to manage the transparency schedules and it works well but I face this warning:

Too many figures [>=15000000] in a shadow overlap Overlapping figure=SHADING DA0, Surface Class=[Shading]

I've set th shadow Calculation as follow:


AverageOverDaysInFrequency,     !- Calculation Method
10,                               !- Calculation Frequency
15000000,                     !- Maximum Figures in Shadow Overlap Calculations
SutherlandHodgman,                !- Polygon Clipping Algorithm
SimpleSkyDiffuseModeling,     !- Sky Diffuse Modeling Algorithm
InternalCalculation,          !- External Shading Calculation Method
No,                           !- Output External Shading Calculation Results
No,                           !- Disable Self-Shading Within ShadingZone Groups
No;                           !- Disable Self-Shading From Shading Zone Groups to Other Zones

And set Output:Diagnostics object with the DoNotMirorDetachedShading option. (If I add more Calculation Frequency the E+ run will terminate).

What should I do?

Shading reduce the Cooling load, will these warnings change the amount of reduced load?

Can I ignore them warnings? image description

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How many total shading surfaces are there in this model?

MJWitte's avatar MJWitte  ( 2019-03-05 17:13:52 -0500 )edit

In a simple way my model has 28 shading systems that each shading system has 6 crossover surfaces like above figure. But in a complete model it has 28 shading systems that each shading system has 16 crossover surfaces.

taher.ahel's avatar taher.ahel  ( 2019-03-06 01:38:35 -0500 )edit

28x16 is nowhere near 15000000. I should have asked how many total surfaces are in the model. If you want to share the idf, please post a link or send it to the helpdesk at

MJWitte's avatar MJWitte  ( 2019-04-19 11:02:58 -0500 )edit