It was recently decided not to include logging functions in the core library.
However it’s useful functionality so here is a copy of the proposed log function (author: @WestLangley).
function log( object3D ) {
object3D .traverse( function ( obj ) {
var s = '|___';
var obj2 = obj;
while ( obj2.parent !== null ) {
s = '\t' + s;
obj2 = obj2.parent;
}
console.log( s + obj.name + ' <' + obj.type + '>' );
} );
},