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API > API/Runtime > API/Runtime/GeometryCore > API/Runtime/GeometryCore/Operations > API/Runtime/GeometryCore/Operations/FMeshBoolean
Syntax
bool bPopulateSecondMeshGroupMap
Remarks
When doing an operation that merges two meshes (Union, Difference, Intersect) and bPopulateSecondMeshGroupMap is true, we populate a map from group ID's in the second mesh to group ID's in the result. Useful when the boolean is part of another operation that might want to track selection into the result.
TODO: It would be nice to have a similar triangle map, but it's more tedious to implement due to the mesh cuts that happen. We might also someday want something similar for the first mesh, where the group ID's will usually stay the same except when all triangles of a particular group are removed and the group ID is repurposed for the second mesh...