I was lucky enough to receive a Leap Motion Controller. It acts like a short-range Kinect for your hands, tracking the position of each individual finger. The Leap's sensors are fast, and spookily accurate. I love it.
For my first "real" Leap project, I planned to use the device on stage, and sculpt a block of virtual clay. Initially I was targeting Flash + Stage3D (aka OpenGL), using a Python script to grab the Leap data and send it to Flash through a socket.
In the end, I switched to Cinder, on the assumption that its performance would be superior. In retrospect, Flash + Stage3D would have performed fine. Even in Cinder, my laptop only managed 15-20 FPS. Instead of switching to the native C++ Leap library, I kept the (slower?) Python socket, which may have been unwise. It was also my first Cinder project, so progress was slow.
Still, I regret nothing!!! The performance was a blast. A momentary "ooooohhh" passed through the crowd when they saw the Leap in action. I was concerned about stage lights interfering with the Leap's sensors, but the Leap was unaffected by the lights.
For the surface of the clay, I'm storing a heightmap in memory. I treat the tips of the fingers as spheres. When the spheres move below the heightmap, some of the height is distributed to neighboring cells. Then the clay is drawn as a triangle mesh. Overall, the effect is a bit rough, but it definitely conveys the feeling of sculpting solid material.
Download the source code. I included a few sample images and videos to get things rolling: