The incoming tangent vectors, or direction handles, associated with the vertices of the shape. Specify each vector as an array of two floating-point values, and collect the vectors into an array the same length as the vertices array.
Each tangent value defaults to [0,0]. When the mask shape is not RotoBezier, this results in a straight line segment.
If the shape is in a RotoBezier mask, all tangent values are ignored and the tangents are automatically calculated.
Array of floating-point pair arrays; read/write.