Lets you register undo operations on specific objects you are about to perform changes on.

The Undo system stores delta changes in the undo stack. Undo operations are automatically combined together based on events Eg. mouse down events will split undo groups.

Undo operations store either per property or per object state. This way they scale well with any scene size. The most important operations are outlined below.

Modifying a single property:

        Undo.RecordObject (myGameObject.light, "Set Light Range");
myGameObject.light.range = 5;

Adding a component :

Undo.AddComponent<RigidBody> (myGameObject);

Creating a new game object:

var go = new GameObject ();
Undo.RegisterCreatedObjectUndo (go, "Created go");

Destroying a game object or component:

        Undo.DestroyObjectImmediate (myGameObject);

Changing transform parenting:

        Undo.SetTransformParent (myGameObject.transform, newTransformParent);