A Python tool that converts MAYA models to JSON --> which then makes a C file to use in ps2dev.
This script converts your model into a JSON file that has selected Maya mesh's vertex positions, UVs, and triangle indices.
MAKE SURE YOUR MODEL IS TRIANGULATED

Head on over to the Python editor in MAYA.
Windows -> General Editors -> Script Editor
Copy and paste the script (MAYA2JSON.py) while selecting your model -- at line 125, make sure to set your directory you want your C file in -- and run it.
e.g.
output_file_path = "/Users/kel/my_game/"
export_ps2_mesh_data(output_file_path)
This script converts the JSON file generated into a C file what you can use as a mesh data.
Run this in terminal.
python3 convert_to_ps2_mesh.py <input_json_file> <output_c_file>
or use the GUI

Christopher Morales Soriano (kelsno) & PS2DEV