jiehui-gelement
Reproduce steps: 1. initialize a MeshLineMaterial instance 2. call `.clone()` on the MeshLineMaterial instance the offending lines are below: https://github.com/spite/THREE.MeshLine/blob/b49ae600898a88bdb3486a3674d5887ca1b61ff6/src/THREE.MeshLine.js#L687-L689