public void setMinDistance(float minDistance) {
        this.minDistance = minDistance;
        if (initialized) {
            zoomCamera(distance);
        }
    }
Sets the min zoom distance of the camera (default is 1)

@param minDistance the desired minimum distance (in world units,
default=1)
jme3-core/src/main/java/com/jme3/app/ChaseCameraAppState.java