**Properties:**

**Methods:**

The

Armclass represents the forearm.Public FunctionsProperty

MatrixBasisThe orthonormal basis vectors for the

Armbone as aMatrix.Basis vectors specify the orientation of a bone.

xBasisPerpendicular to the longitudinal axis of the bone; exits the arm laterally through the sides of the wrist.

yBasis or up vectorPerpendicular to the longitudinal axis of the bone; exits the top and bottom of the arm. More positive in the upward direction.

zBasisAligned with the longitudinal axis of the arm bone. More positive toward the wrist.Matrix basis = arm.Basis; Vector xBasis = basis.xBasis; Vector yBasis = basis.yBasis; Vector zBasis = basis.zBasis; Vector armCenter = arm.ElbowPosition + (arm.WristPosition - arm.ElbowPosition) * 0.5f; Matrix transform = new Matrix (xBasis, yBasis, zBasis, armCenter);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.

Note that converting the basis vectors directly into a quaternion representation is not mathematically valid. If you use quaternions, create them from the derived rotation matrix not directly from the bases.

Return- The basis of the arm bone as a matrix.
Since- 2.0.3

VectorCenterThe center of the forearm.

This location represents the midpoint of the arm between the wrist position and the elbow position.

Since- 2.1.0

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

Vector direction = arm.Direction;

Since- 2.0.3

VectorElbowPositionThe position of the elbow.

Vector elbow = arm.ElbowPosition;If not in view, the elbow position is estimated based on typical human anatomical proportions.

Since- 2.0.3

ArmInvalidbool

IsValidfloat

WidthThe average width of the arm.

float width = arm.Width; //length Vector displacement = arm.ElbowPosition - arm.WristPosition; float length = displacement.Magnitude;

Since- 2.0.3

VectorWristPositionThe position of the wrist.

Vector wrist = arm.WristPosition;Note that the wrist position is not collocated with the end of any bone in the hand. There is a gap of a few centimeters since the carpal bones are not included in the skeleton model.

Since- 2.0.3