As advised in the error message, I've used Output:Diagnositcs
"DisplayExtraWarnings" to get additional information.
An example of what that produced is here:
** Warning ** Too many figures [>=15000] in a shadow overlap
** ~~~ ** Overlapping figure=Mir-POLYGON 2 OF BUILDING 1 - SHADING PLANE 55, Surface Class=[Detached
Shading:Building]
** ~~~ ** This error occurred 1 times.
** ~~~ ** Figure being Overlapped=CIRCULATION10.1:CIRCULATION10.1_EXTFLOOR_1_10_0, Surface Class=[Floor]
*************
And, I did read the related post here, which gives some ideas on how to reduce the likelyhood of this error occurance.
Is this error occurrence only related to large number of shading surfaces, or is it also more likely to occur with large number of building surfaces? I have some ideas on how to reduce the Shading:Building:Detailed
surfaces (currently ~150 in my model), but it would be difficult to reduce the BuildingSurface:Detailed
surfaces (currently ~4100 in my model)
When this error occurs, what is the result in the simulation? Is shading ignored for that timestep?