Material onBind callback improvement
Material onBind callback improvement

A minor modification that allows this callback to be much more useful.
By passing the current mesh as an argument, it is possible to change material/shader parameters according to custom properties.
sebavan/Babylon.js,Hersir88/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,abow/Babylon.js,abow/Babylon.js,Temechon/Babylon.js,abow/Babylon.js,jbousquie/Babylon.js,Temechon/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,jbousquie/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,jbousquie/Babylon.js,Kesshi/Babylon.js,RaananW/Babylon.js,NicolasBuecher/Babylon.js,NicolasBuecher/Babylon.js,Temechon/Babylon.js,BabylonJS/Babylon.js,Hersir88/Babylon.js,Kesshi/Babylon.js,NicolasBuecher/Babylon.js,Hersir88/Babylon.js