convert to fbx file

[andrew-atef]

How to convert Motion-X files to FBX for 3D animation programs?

[hushaoqing]

+1

[JYuhao88]

https://github.com/JYuhao88/SMPLerX-Server
Here are some features you might find helpful.

[hushaoqing]

I solved this by first converting to AMASS format and then using smplx_blender_addon to export fbx.

1. to AMASS format

def convert_to_amass_npz(npy_path, npz_path):
    # Read motion data from npy file
    motion = np.load(npy_path)
    motion = torch.tensor(motion).float()

    # Extract motion parameters
    motion_parms = {
        "root_orient": motion[:, :3],
        "pose_body": motion[:, 3 : 3 + 63],
        "pose_hand": motion[:, 66 : 66 + 90],
        "pose_jaw": motion[:, 66 + 90 : 66 + 93],
        "trans": motion[:, 309 : 309 + 3],
        "betas": motion[:, 312:],
    }

    # Create amass format data
    frame_length = motion.shape[0]
    gender = "male"

    left_eye_smplhf_and_right_eye_smplhf = np.zeros((frame_length, 2 * 3))
    # AMASS JOINTS format
    poses = np.concatenate(
        (
            motion_parms["root_orient"],
            motion_parms["pose_body"],
            motion_parms["pose_jaw"],
            left_eye_smplhf_and_right_eye_smplhf,
            motion_parms["pose_hand"],
        ),
        axis=1,
    )
    trans = motion_parms["trans"]
    betas = motion_parms["betas"][0]

    # Save data in amass format (NPZ file)
    os.makedirs(
        os.path.dirname(npz_path), exist_ok=True
    )  # Create necessary directories
    np.savez(
        npz_path,
        poses=poses,
        gender=gender,
        mocap_framerate=30,
        betas=betas,
        trans=trans,
    )

2. https://gitlab.tuebingen.mpg.de/jtesch/smplx_blender_addon#installation