Identify what Brep was not split

Rhino Developer
1

Is there any way to identify what brep was or was not split in firstSet when using:
C# Brep.CreateBooleanSplit Method (IEnumerable firstSet, IEnumerable secondSet, Double)

Regards

2

Iterate through result and check nulls.

Other way is to boolean one by one, the performance is not so lower…