Here’s my second iteration on a project using Unity mesh deformation on a Microsoft Surface for moldable virtual clay. Now, you can spin the ball with your hand as well as molding with fingers.
It’s difficult to get the program to recognize a multitouch gesture at the exclusion of a gesture with fewer touches; I have it delay a bit to see whether the other fingers will show up before it responds. As you can see in the video, too quick of a response time leads to some extra dents in the clay.