This image was taken from Chunky , a Minecraft rendering tool that comes with a GUI. It's simpler to use than the command line stuff I've just described, and much easier to get textures working, but I've never had much luck with getting it to render large worlds like the PC Gamer server. This image is from Chunky's map view, which helps you select the areas of your save you want to render, while also looking cool all on its own.
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