RhinoCommon API
FileObjWriteOptionsMergeNestedGroupingNames Property |
Setting to merge nested layer or group names into a single OBJ group name
Namespace: Rhino.FileIO
Assembly: RhinoCommon (in RhinoCommon.dll)

public bool MergeNestedGroupingNames { get; set; }
Public Property MergeNestedGroupingNames As Boolean Get Set
Property Value
Type: Boolean
Setting this to true will take a layer setup like this in Rhino
Grandparent
Parent
Child
and make a group name of Grandparent__Parent__Child in obj.
If false it will be 3 separate group names in obj and will look like this
in the file.
g Grandparent Parent Child

Rhino for Windows
Supported in: 6.14