itch.io

You can use it. Currently an avatar needs to have eye bones assigned though in the import settings in unity. Suva was originally not intended to be used with avatars that do not have eyes. If your avatar does not have eyes you can try assigning an unused bone to both eyes or create empty eyebones in e. g. Blender. Suva has fake eyetracking built in that moves these bones when you don't have a tobii tracker.