It came to my attention that in ThreeJs you do the following:
var obj = new THREE.BoxGeometry();
scene.add(obj);
obj.position.z += 23.5;
Upon passing the cube object into the scene along with all its vertices, you then modify its variables and scene recognizes the new coordinates. How is this achieved without having to pass obj back into scene?
The reason behind this occurrence is due to passing the object a by reference to the scene.add method. This means that any changes made to a will be reflected in the scene object as well.
You can test this behavior yourself by running the following code in your JavaScript console:
var a = {foo: 'bar'}, scene = {
add: function(obj) {this.obj = obj},
print: function() { console.log(this.obj.foo);}
});
scene.add(a);
scene.print(); // outputs bar
a.foo = 'baz';
scene.print(); // outputs baz
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