public static Matrix4f convertSteamVRMatrix3ToMatrix4f(org.lwjgl.openvr.HmdMatrix34 hmdMatrix, Matrix4f mat){
        mat.set(hmdMatrix.m(0), hmdMatrix.m(1), hmdMatrix.m(2), hmdMatrix.m(3),
                hmdMatrix.m(4), hmdMatrix.m(5), hmdMatrix.m(6), hmdMatrix.m(7),
                hmdMatrix.m(8), hmdMatrix.m(9), hmdMatrix.m(10), hmdMatrix.m(11),
                0f, 0f, 0f, 1f);
        return mat;
    }
Convert specific OpenVR {@link org.lwjgl.openvr.HmdMatrix34 HmdMatrix34} into JME {@link Matrix4f Matrix4f}
@param hmdMatrix the input matrix
@param mat the converted matrix
@return the converted matrix
jme3-vr/src/main/java/com/jme3/input/vr/lwjgl_openvr/LWJGLOpenVR.java