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

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