public void setMinVerticalRotation(float minHeight) {
        this.minVerticalRotation = minHeight;
        if (initialized) {
            rotateCamera();
        }
    }
Sets the minimal vertical rotation angle in radian of the camera around
the target default is 0;

@param minHeight the desired minimum angle (in radians, default=0)
jme3-core/src/main/java/com/jme3/app/ChaseCameraAppState.java