Running
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Run a loop in a file `loep.lua` with

     $ love . loep

Rendering
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Render it with

    $ ./render.sh loep

Writing
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A loop can implement `:draw()` and `:update(dt)`.
A value `self.time` is incremented by `dt` automatically in `DemoLoop:update` so you can just use that to render with.
Set a `Loop.length` or `self.length` to make it wrap around during render after that many seconds (see example).