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In the late 2000's I was really into 3D animation and making 3D games. I was primarily using a free program called Anim8or. The program saved its files as a readable text file that could easily be edited. Also, to program had some simple methods for morphing model animation. I decided to do a few experiments dynamically creating animation by combining the output of another program I was using at the time Game Maker.
A LOOOooong time ago...well 2001-2002'ish (I think). I was playing around a lot with Game Maker by Mark Overmars. There was developer named Brent who went by the handle Freegadgets who made a 3D engine Gadget 3D. It was really quite impressive. He started off by simply remaking a simple version of Doom. Over time he expanded it and eventually it used actual 3D polygons. It was loads of fun to build games with it and very easy. It was also a great learning tool. (As with MANY of my old projects I lost most of the games and models I built during this period).
I started working on a game called Thnog and Jeff in like..I dunno, the early 2000's. The original version was built using the original Game Maker by Mark Overmars. I had several variants that even eventually moved to 3D.