Have a look at psx gpu prims, the other types probably match onto that, POLY_FT4 etc. Perhaps the other types are g/flat/untextured shaded tri and quad?
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You aren't distributing any data belonging to them, you are distributing converted code to make the data work, still requiring every user to launch it and link to original data folders/archives for the conversion to convert original data that they already have by having bought the game.
The gears document has a lot of stuff in it but with an auto decompiler maybe you can put together working stuff together with what you know from the gears doc. I think thats how ergonomy_joe has been doing it. Still, very interesting project and hope to see more!