public void setMaxVerticalRotation(float maxVerticalRotation) {
        this.maxVerticalRotation = maxVerticalRotation;
        if (initialized) {
            rotateCamera();
        }
    }
Sets the maximal vertical rotation angle in radian of the camera around
the target. Default is Pi/2;

@param maxVerticalRotation the desired maximum angle (in radians,
default=Pi/2)
jme3-core/src/main/java/com/jme3/app/ChaseCameraAppState.java