public void Update(
	TimeSpan deltaTime
)

Public Sub Update ( 
	deltaTime As TimeSpan
)

public:
void Update(
	TimeSpan deltaTime
)

member Update : 
        deltaTime : TimeSpan -> unit 

A scene needs to be updated once per frame. The method recomputes the internal information that is used for scene queries (such as frustum culling) and may perform other optimizations.