POV-Ray : Documentation : Use Render Animation
  POV-Ray 3.6 Documentation Online View Keep Single Instance Show Toolbar Use Render Animation

Turns on or off the use of the animated image in the top-right-hand corner of the tool bar. If it's turned on, and POV-Ray is rendering, an animation will be shown to indicate that a render is in progress. This animation is done from pre-generated images and uses very little CPU time. Keep Single Instance Show Toolbar

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