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InfluxDB
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OBJ is a reasonably simple line-based human-readable file format. It's pretty easy to generate OBJs manually if you've understood how OBJs work. Here's my subset-of-OBJ "library": https://github.com/appgurueu/modlib/blob/master/minetest/obj.lua (caveat: it lacks docs).
And here's an example of how you could generate OBJs directly, without a library: https://github.com/spiraling-down/game/blob/master/mods/sd_map/generate_extrusion_mesh.lua (this was rushed during a game jam, so it isn't optimal).
Maybe this repository has some code that might be useful - https://github.com/Wiladams/LuaCAD