three.js: Access Scene Objects by Name or ID

You can do this:

myObject.name = "objectName";
...
var object = scene.getObjectByName( "objectName" );

or to recursively search the scene graph

var object = scene.getObjectByName( "objectName", true );

Alternatively, you can search by ID.

var object = scene.getObjectById( 4, true );

three.js r.61