title: Cannot invoke initializer for type 'SCNMatrix4'
body: <p>I'm working on <code>ARKit</code> and trying to initialize <code>SCNMatrix</code> but its throwing following error:</p>
  
  <p>Code snippet:</p>
  
  <pre><code>if let frame = self.sceneView.session.currentFrame {
      let mat = SCNMatrix4(frame.camera.transform) 
  
      return (dir, pos)
  }
  </code></pre>
  
  <p>Error:</p>
  
  <blockquote>
    <p>Cannot invoke initializer for type ‘SCNMatrix4’ with an argument list
    of type ‘(matrix_float4x4)’ Overloads for ‘SCNMatrix4’ exist with
    these partially matching parameter lists: (float4x4), (double4x4)</p>
  </blockquote>
  
  <p>Does anyone face something similar kind of issue?</p>