Enables certain nodes only when approximately visible. The VisibilityEnabler will disable [RigidBody] and [AnimationPlayer] nodes when they are not visible. It will only affect other nodes within the same scene as the VisibilityEnabler itself. [b]Note:[/b] VisibilityEnabler uses an approximate heuristic for performance reasons. It doesn't take walls and other occlusion into account. If you need exact visibility checking, use another method such as adding an [Area] node as a child of a [Camera] node. [b]Note:[/b] VisibilityEnabler will not affect nodes added after scene initialization. Returns whether the enabler identified by given [enum Enabler] constant is active. Sets active state of the enabler identified by given [enum Enabler] constant. If [code]true[/code], [RigidBody] nodes will be paused. If [code]true[/code], [AnimationPlayer] nodes will be paused. This enabler will pause [AnimationPlayer] nodes. This enabler will freeze [RigidBody] nodes. Represents the size of the [enum Enabler] enum.