The rig was made with Blendshapes driven by joint positions.
Visual Artist Murat Miroglu has shared a stunning new WiP render from one of the projects he is currently working on. The render shows an absolutely amazing and realistic hand rig, made with Maya and ZBrush and capable of various complex movements. According to the artist, the rig was created using Blendshapes, driven by the joint positions, and shot sculpting for specific keyframes. Additionally, Murat commented that the project is being created in collaboration with Rigging Supervisor Harris Wu.