If you're looking to dive into FiveM modeling, you'll need a specific toolkit: ZModeler3:
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In the context of FiveM, a .z3d file is the "working file." It contains all the hierarchical data, materials, and textures before they are exported into the .yft (model) and .ytd (texture) formats that the GTA V engine can read. Key Applications If you're looking to dive into FiveM modeling,
[RELEASE] Z3D Model Pack – 5 Cars | Add-On | Stream Ready these models are ready to drag