@Override
    public Matrix4f getHMDMatrixProjectionRightEye(Camera cam){
        if( hmdProjectionRightEye != null ) {
            return hmdProjectionRightEye;
        } else {
            HmdMatrix44 mat = HmdMatrix44.create();
            mat = VRSystem.VRSystem_GetProjectionMatrix(VR.EVREye_Eye_Right, cam.getFrustumNear(), cam.getFrustumFar(), mat);
            hmdProjectionRightEye = new Matrix4f();
            convertSteamVRMatrix4ToMatrix4f(mat, hmdProjectionRightEye);
            return hmdProjectionRightEye;
        }
    }
Initialize the headset camera.
@param allowed <code>true</code> is the use of the headset camera is allowed and <code>false</code> otherwise.
@return token for camera
jme3-vr/src/main/java/com/jme3/input/vr/lwjgl_openvr/LWJGLOpenVR.java