Hi,

imagine you have rendered a scene completely. Then you make so me
changes, and want - in order to avoid lots of render time - to render
just an area (a part) of the scene by selecting that area inside the
render window.

If you didn't make any errors in scene writing, fine. You get your area
render.

But if you made any error, POV-Ray of course quits with an error
message, but also unfortunately your previously rendered complete (or
partial) scene disappears, you cannot select any area again inside the
now empty render window, and are forced to render the entire scene again
just to have selectable areas again (if you didn't write down the area
coordinates with paper and pen). That costs a lot of time. my last full
render took 6 days!!!

My advise: allow the render window to keep the last successful render.
Or make it possible to load last-rendered images (via dropdown) into it.

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