Helpers: Simplify copy() and clone(). #19921
Merged
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Some helpers support copy and clone operations.
The current implementation is based on assumptions before #19471 was merged. Since classes like
Line
orMesh
can use theclone()
implementation fromObject3D
now, it's not necessary to overwrite the method in helpers.Besides,
GridHelper.copy()
can now use the implementation ofLineSegments
.