My idea is to create a filter that requires collaborative effort from the user and the user’s pet. There are two objects in the 3D space where the Minecraft pig is fixated on the user’s head, and the duck moves along with the pig in space but it is further up front in the z direction. The goal was to have both the user and the pet move their head in the same directions at the same time, which I thought would be a small challenge but it turns out to be a big challenge. So that was that.
If you want to know how hard it is with a dog you can watch this chaotic video,