function AddAction(object, parent, index)
{
	Action.call(this);
	
	this.object = object;
	this.index = index !== undefined ? index : -1;

	this.parent = parent;
}
Add an object to the scene.

The object can be inserted at a specific index inside the children list.

@class AddAction
@extends {Action}
@param {Object3D} object Object to be added.
@param {Object3D} parent Parent to add the object.
@param {number} index Index to add the object to.