These nodes are for tracking hands, fingers, and tools with a Leap Motion device.

Data from a Leap Motion device is grouped into frames. Each frame contains information about hands and pointables (fingers and tools) detected at one moment in time.

Leap Motion considers a pointable to be a tool if it’s thinner, straighter, and longer than Leap Motion’s parameters for a finger.

Each hand or pointable has a unique ID that can be used to track it across consecutive frames in which it’s detected. If the hand or pointable is lost and re-detected, its ID changes.

Leap Motion provides a touch plane that can be used for interaction. Derived from the current hand and finger position within a frame, the touch plane is an imaginary surface that pointables can interact with. If a pointable is near the touch plane, then it can be in one of two touch zones. If the pointable is entirely on the hand’s side of the touch plane, then it’s in the “hovering” touch zone. If the pointable is touching or passing through the touch plane, then it’s in the “touching” touch zone.

These nodes use Vuo Coordinates based on Leap Motion’s interaction box, which is a rectangular box within the Leap Motion device’s field of view. Most hand motions are expected to take place within the interaction box, although some may fall outside of it and still be detected by the Leap Motion device. The interaction box’s center is at Vuo Coordinate (0,0,0). The interaction box’s left edge is at Vuo X-coordinate -1, and its right edge is at Vuo X-coordinate 1. The Vuo Y-coordinates increase from bottom to top of the interaction box. The Vuo Z-coordinates increase from back to front of the interaction box.

The Receive Leap Frame node is your starting point for working with a Leap Motion device.

The Get Frame Values node lets you get the information from a frame. From there, the Get Hand Values and Get Pointable Values nodes let you get further information about hands and pointables.


If Receive Leap Frame is not firing events:

Example compositions: