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Most titles use one of the standard Nintendo-provided microcodes for the RSP (Reality Signal Processor, the programmable part of the graphics chip).

F3DEX2 ("Fast 3D, Extended, Version 2") is one of the well-documented ones and one of the ones used by most games. You can find a breakdown of the command stream here: https://wiki.cloudmodding.com/oot/F3DZEX

This viewer is actually an .obj model viewer, and has nothing to do with that. For something that's actually an F3DEX viewer online, I wrote https://magcius.github.io/model-viewer/#zelview/data/zelview...

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