LeapMotionArm Class

LeapMotionArm Class

Members

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float getWidth ( ) #

Returns the width of the forearm, in meters.

Return value

Width of the forearm, in meters.

vec3 getElbowPosition ( ) #

Returns the coordinates of the elbow position.

Return value

Coordinates of the elbow position.

vec3 getWristPosition ( ) #

Returns the coordinates of the end of the bone, closest to the finger tip (distal).

Return value

Coordinates of the wrist position.

vec3 getCenter ( ) #

Returns the coordinates of the center of the forearm.

Return value

Coordinates of the center of the forearm.

vec3 getDirection ( ) #

Returns the normalized direction in which the arm is pointing (from elbow to wrist).

Return value

Normalized direction in which the arm is pointing (from elbow to wrist).

mat4 getBasis ( ) #

Returns the orthonormal basis vectors for the arm as a Matrix.

Basis vectors specify the orientation of the arm bone:

• X - Perpendicular to the longitudinal axis of the arm bone; exits the arm laterally through the sides of the wrist.
• Y (or up vector) - Perpendicular to the longitudinal axis of the arm bone; exits the top and bottom of the arm. Increases in the upward direction.
• Z - Aligned with the longitudinal axis of the arm bone. Increases toward the wrist.

The bases provided for the right arm use the right-hand rule; those for the left arm use the left-hand rule. Thus, the positive direction of the x-basis is to the right for the right arm and to the left for the left arm. You can change from right-hand to left-hand rule by multiplying the z basis vector by -1.

You can use the basis vectors for such purposes as measuring complex finger poses and skeletal animation.

Return value

Orthonormal basis vectors for the arm bone as a Matrix.

int isValid ( ) #

Returns a value indicating if the arm contains valid tracking data.

Return value

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