Why is it necessary to call the .call(this) method when extending a THREE.js "class"?

Currently, I am in the process of creating a new object that should inherit from THREE.Object3D(). In my code snippet, you can see how I have set it up:

function myNewObject() {
  THREE.Object3D.call(this);

  //...

}

myNewObject.prototype = new THREE.Object3D();
myNewObject.prototype.constructor = myNewObject;

One particular aspect that is puzzling me is why I need to invoke 'THREE.Object3D.call(this)' inside myNewObject(). Shouldn't it suffice that I am assigning the prototype to a THREE.Object3D() object?

javascriptthree.js

Answer №1

When creating a new Javascript subclass, it is recommended to use the following approach:

MYOBJECT.prototype = Object.create( PARENT.prototype );
MYOBJECT.prototype.constructor = MYOBJECT;

instead of using new PARENT()

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