n ARKit viewMatrix is define as the transform matrix from world coordinate frame to camera frame coordinate. eg- this is from the console of Xcode and it is the output of frame?.camera.viewMatrix(for: orientation) viewMatrix is Optional(simd_float4x4([[-0.21701495, -0.8391591, -0.49871516, 0.0], [-0.9272899, 0.017577814, 0.3739312, 0.0], [-0.3050214, 0.54360217, -0.78195834, 0.0], [0.15720224, -0.23272672, 0.0491977, 1.0]])) forth raw is not [0,0,0,1] like. could you please explain me why is this?