var EPSILON = 1e-4;

    var eyeExp = [0, 0, 0];
    var fwdExp = [1, 0, 0];
    var upExp = [0, 1, 0];

    var centerExp = [0, 0, 0];
    goog.vec.Vec3.add(eyeExp, fwdExp, centerExp);

    var view = goog.vec.Matrix4.create();
    goog.vec.Matrix4.lookAt(view, eyeExp, centerExp, upExp);

    var eyeRes = [0, 0, 0];
    var fwdRes = [0, 0, 0];
    var upRes = [0, 0, 0];
    goog.vec.Matrix4.toLookAt(view, eyeRes, fwdRes, upRes);
    assertElementsRoughlyEqual(eyeExp, eyeRes, EPSILON);
    assertElementsRou