Chaseconv

Chaseconv is a fast and simple 3D asset converter for Grand Chase. It can convert 3D assets from the game into GLTF files and vice-versa.

Download

You can download the application in the Releases Page.

Usage

Interactive mode

1. Drag and drop the desired files onto chaseconv.exe (they should belong to the same model!).
2. Select the format you want to convert the files into.
3. Select the output folder.

Here's a small demonstration:

CLI mode

chaseconv --format <glb|gc> --output <dir> [files...]

• --format / -f: Target format — glb (or gltf) for GLTF, gc (or p3m/frm) for Grand Chase.
• --output / -o: Output directory (defaults to output/).

Example:

chaseconv -f glb -o output/ model.p3m anim_wait.frm anim_run.frm
chaseconv -f gc -o output/ model.glb

Blender workflow

When round-tripping through Blender (GLTF → Blender → GLTF → P3M/FRM), use these export settings to preserve animation data:

• Set the scene FPS to 55 (bpy.context.scene.render.fps = 55) before importing the GLB, to match Grand Chase's animation rate.
• Disable force sampling (export_force_sampling=False) to preserve original keyframes instead of resampling them.
• Disable optimization (export_optimize_animation_size=False) to prevent Blender from removing "redundant" keyframes.
• Export each action separately (export_animation_mode='ACTIONS') and reset pose bones between actions (export_reset_pose_bones=True).

Limitations

Exporting (GC → GLTF)

• You can't export a standalone animation to GLTF. You can only export animations alongside models because joint data is stored inside P3M files.
• Some animations may lose data when being exported. That's because some models have fewer joints than their animations. So the extra animation channels end up being discarded.

Importing (GLTF → GC)

• All bones of the model should be named "bone_X", where X is the index of the bone (e.g., "bone_0", "bone_1", ...). The root bone should be named "root".
• Bone rotations in the bind pose are supported. Models exported from tools like Blender (which may add bone orientation rotations) can be converted back without issues.
• Regarding animations, the bones of the model only support rotations, whereas the root bone only supports translations.
• Only the first skeleton/skin in each GLTF file will be taken into account.
• Bone rotation matrices undergo a quaternion round-trip during conversion, which introduces precision loss of ~0.03–0.05°.

Contributing

• Found a bug? Please create an issue describing the problem.

• Looking for a specific feature? Feel free to leave a pull request.