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Graphics / Drawn vertex array not showing up when cleared between frames

« on: June 11, 2020, 12:47:27 am »

I have a vertex array that is being processed, then drawn to a RenderWindow. After calling display on the window, I want to clear the vertex array, making it ready for another round of processing. However, when clearing it - nothing shows up in the window. It works when not clearing, but now I'm drawing junk since the number of vertices differ between frames...

my loop (pseudo):

  populate vertex array
  clear window
  draw vertex array to window
  display window
  clear vertex array (now nothing shows in window)

Am i doing something wrong here (probably)? Help!