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I started learning to mod Quake 10 years ago or so, and moving on from more simple quake mods to full blown games using the same engine wasn't very hard and I've been learning lots of tricks and techniques over the years. There aren't too many great resources out there for tech that not many people use but I'm sure people can still learn it if they put in the effort. I tried to point someone else to the right direction on the ldjam page (https://ldjam.com/events/ludum-dare/44/bloodletter) comments, so check it out!