code: function(m){
  				var l = m.getFaces().length;
  				for(var i=0;i<l;i++){
  					var f = m.getFaces()[i];
  					this.addFace(f.a,f.b,f.c);
  				}
  				return this;
  			}
docs: add the contents of a TriangleMesh to this TriangleMesh
  @param {TriangleMesh} m
  @returns itself