Hand

属性：

[arm]
[basis]
[confidence]
[direction]
[fingers]
[frame]
[grab_strength]
[id]
[is_left]
[is_right]
[is_valid]
[palm_normal]
[palm_position]
[palm_velocity]
[palm_width]
[pinch_strength]
[pointables]
[sphere_center]
[sphere_radius]
[stabilized_palm_position]
[time_visible]
[tools]
[wrist_position]