Convert FBX to PMX

Fbx to pmx conversion

FBX and PMX are both 3D model formats, but they are built for different workflows. FBX (Autodesk FBX Interchange File) is a broad exchange format used for meshes, rigs, animations, materials, and scene data. PMX (MikuMikuDance Model eXtended) is the model format used by MikuMikuDance (MMD) and is designed around MMD-specific bones, morphs, materials, and physics.

Direct FBX to PMX conversion is usually not one-click. The two formats store data differently, and PMX has conventions that most FBX files do not follow automatically. In practice, you usually import the FBX into a 3D editor, adapt the model to MMD requirements, and then export it as PMX with an MMD-compatible add-on or tool.

Common workflow

A typical workflow uses Blender with an MMD add-on such as mmd_tools:

1. Import the FBX file into Blender.
2. Check the model scale, axis orientation, bone hierarchy, and materials.
3. Rename and reorganize bones and meshes to match MMD conventions.
4. Fix weights, morphs, and physics if needed.
5. Export to PMX using an MMD export workflow or compatible add-on.

Important limitations

Not every FBX file converts cleanly to PMX. Difficult cases include complex rigs, nonstandard bone structures, advanced shaders, embedded animations, and material setups that do not map well to MMD. PMX also has its own limits and expectations, so cleanup is often required after import.

FBX Converter is not a reliable solution for FBX to PMX conversion and does not provide a direct PMX export path. Blender is generally the more practical starting point because it supports FBX import and can be extended for MMD-oriented work.

What to expect

If your goal is to use the model in MikuMikuDance, expect to spend time on:

• Bone cleanup and renaming
• Material simplification
• Texture path fixes
• Physics and morph setup
• Model scale and axis correction

Tip: If the FBX already comes from an MMD-friendly source, conversion is much easier. If it was made for a game engine or film pipeline, expect more manual work.

In short, FBX to PMX conversion is possible, but it usually requires manual preparation and MMD-specific tools rather than a simple file conversion.