Follow Track Constraint 跟踪路径约束

默认情况下，跟踪路径约束是使物体在框架具有相同的位置。就像发生在由摄像机和原始物体位置定义的单一平面上追踪该物体的运动那样。

• Active Clip激活剪辑
• Receive tracking data from the active movie clip in the Movie Clip editor.If unchecked, an option appears to choose from the other available clips.
• 3D Position 3D 位置
• 移除畸变
• Parent to the undistorted position of the 2D track.
• 匹配方式
• Defines how the footage is fitted in the camera frame.
• Select the camera to which the motion is parented to (if active an empty scene camera is used).
• Depth Object 深度目标
• 如果设置了此物体，约束物体会投射到这个深度物体表面，可用于伪造面部化妆。
• Constraint to F-Curve 约束到图形曲线