THREE.js Change the opacity of an entire branch

Question

Is there any way to change the opacity/alpha of all hierarchy (branch) rather than per each mesh material?

Answer 1

No. You can, however, use object.traverse() to set the opacity of an object's material and it's children.

mesh.traverse( function( node ) {
    if( node.material ) {
        node.material.opacity = 0.5;
        node.material.transparent = true;
    }
});

three.js r.56