Fix mesh vertices updated when adding points to a PCS
Fix mesh vertices updated when adding points to a PCS

sebavan/Babylon.js,BabylonJS/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,RaananW/Babylon.js,RaananW/Babylon.js