struct IMovieCallback {
  enum ECallbackReason {
    CBR_CHANGENODE,
    CBR_CHANGETRACK
  };
};

IMovieSystem.h

! Callback-class

enum ECallbackReason {
  CBR_CHANGENODE,
  CBR_CHANGETRACK
};

IMovieSystem.h

! Callback-reasons

virtual ~IMovieCallback();

virtual bool IsSequenceCamUsed() const = 0;

virtual void OnMovieCallback(ECallbackReason reason, IAnimNode * pNode) = 0;

Called by movie system.

virtual void OnSetCamera(const SCameraParams & Params) = 0;