@Override
    public VRTrackedController getTrackedController(int index) {
        if (trackedControllers != null) {
            if ((trackedControllers.size() > 0) && (index < trackedControllers.size())) {
                return trackedControllers.get(index);
            }
        }

        return null;
    }
Create a new
<a href="https://github.com/ValveSoftware/openvr/wiki/API-Documentation">OpenVR</a>
input attached to the given VR environment.

@param environment the VR environment to which the input is attached.
jme3-vr/src/main/java/com/jme3/input/vr/lwjgl_openvr/LWJGLOpenVRInput.java