title: Convert RenderTargetBitmap to Bitmap
body: <p>This looks like a dup question, it is, but no one has answered the actual question(s).</p>
  
  <p>Here goes:
  Basically, I'm rendering a ViewPort3D as a 2D snapshot in code, but need to convert that type 
  <code>RenderTargetBitmap</code> into the type <code>System.Drawing.Bitmap</code> (for further processing on the 2D side).</p>
  
  <pre><code>Dim bmpRen As New RenderTargetBitmap(1024, 550, 96, 96, PixelFormats.Pbgra32)
  bmpRen.Render(Me.vp3dTiles) 'render the viewport as 2D snapshot
  </code></pre>
  
  <p>While I know how to save it to a file, I'd rather skip that step and convert the <code>bmpRen</code> to a <code>System.Drawing.Bitmap</code> type, but there is no method to do so.</p>