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Unigine.Plugins.LeapMotion.Hand Struct

Notice
LeapMotion plugin must be loaded.

Hands are the main entity tracked by the Leap Motion controller. The controller maintains an inner model of the human hand and validates the data from its sensors against this model. This allows the controller to track finger positions even when a finger is not completely visible.

Notice
It is possible for movement or changes in position to be lost when a finger is behind or directly in front of the hand (from the point of view of the controller).

The Leap Motion software matches the internal model against the existing data. In some cases, the software can make an incorrect match – for example, identifying a right hand as a left hand.

This structure represents a physical hand detected by the Leap and provides access to its attributes describing the hand position, orientation, and movement. All coordinates are relative to the origin of the Leap Motion coordinate system.

The Hand structure is declared as follows:

Source code (C#)
public struct Hand
	{
		public int id;
		public int type;
		public int is_valid;
		public float palm_width;
		public vec3 palm_position;
		public vec3 palm_stabilized_position;
		public vec3 palm_velocity;
		public vec3 palm_normal;
		public vec3 direction;
		public vec3 wrist_position;
		public mat4 basis;

		public Arm arm;
		public Dictionary<int, Finger> fingers;
	};

The last two items of the struct are:

arm Arm of the hand.
fingers List of all fingers of the hand.

LeapMotionHand Class

Properties

int id#

The ID of the hand

int type#

The Type of the hand:
  • 0 - left hand
  • 1 - right hand

float palm_width#

The Width of the palm when the hand is in a flat position, in meters.

vec3 palm_position#

The Coordinates of the position of the palm.

vec3 palm_stabilized_position#

The Coordinates of the modified palm position with some additional smoothing and stabilization applied. Smoothing and stabilization is performed in order to make this value more suitable for interaction with 2D content. The stabilized position lags behind the palm position by a variable amount, depending primarily on the speed of movement.

vec3 wrist_position#

The Coordinates of the position of the wrist.

vec3 palm_velocity#

The Rate of change of the palm position, in m/s.

vec3 palm_normal#

The Coordinates of the normal vector to the palm.

vec3 direction#

The Normalized direction from the palm position toward the fingers.

mat4 basis#

The Orthonormal basis vectors for this Bone as a Matrix.

int is_valid#

The 1 if the hand contains valid tracking data; otherwise, 0.

Members


Last update: 14.12.2022
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