Ràng Buộc Giám Sát Chuyển Động (Follow Track Constraint)

The Follow Track constraint makes an object imitate the movement of a motion tracking marker. This makes the object appear at the same position in the render as where the marker appears in the motion-tracked video.

By default, the object follows the 2D motion of the marker in the video on a plane in the 3D world. However, it's also possible to make the object follow the reconstructed 3D position of the marker. The latter requires setting up at least eight markers and clicking Giải Nghiệm Chuyển Động của Máy Quay Phim / Đối Tượng (Solve Camera/Object Motion).

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The Kết Nối Đối Tượng Rỗng với Giám Sát (Link Empty to Track) button in the Movie Clip Editor creates an Empty and assigns it this constraint in one click.

Các Tùy Chọn (Options)

Follow Track constraint.

Đoạn Phim đang Hoạt Động (Active Clip)

Whether the tracking marker is in the scene's Active Clip. If unchecked, a selector appears for choosing another clip.

Vị Trí 3D (3D Position)

Whether to use the tracking marker's reconstructed world position (instead of its position in the flat video).

Chưa Biến Dạng (Undistort)

Whether to use the tracking marker's video position after compensating for lens distortion (see Lens settings). Not available when 3D Position is checked.

Phương Pháp Khung Hình (Frame Method)

How to handle a difference in aspect ratio between the tracked video footage and the rendered image.

Kéo Giãn (Stretch):

The object is positioned as though the video were stretched to exactly match the size of the rendered image.

Khít Vừa (Fit):

The object is positioned as though the video were made as large as possible while still keeping its original aspect ratio and fitting inside the rendered image along both axes.

Cắt Xén (Crop):

The object is positioned as though the video were made as large as possible while still keeping its original aspect ratio and fitting inside the rendered image along one axis.

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The Đặt làm Nền (Set as Background) button in the Movie Clip Editor sets the video as the background for the camera. This background can then be resized by setting the same Frame Method in the Ảnh Nền (Background Images) panel of the camera's properties.

Object (Đối Tượng)

The physical object containing the tracking marker to follow. See the Bảng các Đối Tượng (Objects Panel) in the Movie Clip Editor. If left empty, Track will list the markers used to reconstruct the physical camera.

Giám Sát/Rãnh (Track)

The tracking marker to follow.

Máy Quay Phim [Camera]

The Blender camera in whose field of view the constrained object should appear. If left empty, the scene's active camera is used.

Đối Tượng định Độ Sâu (Depth Object)

If this object is set, the constrained object will be projected onto its surface. This can be used to create a facial makeup effect, for example. Not available when 3D Position is checked.

Ràng Buộc thành Đường Cong-F (Constraint to F-Curve)

Replaces the constraint by a set of equivalent keyframes.

Tác Động/Ảnh Hưởng (Influence)

How strongly the constraint affects its owner.

Ví Dụ [Example]

Video Ví Dụ về Theo Dõi Giám Sát (Follow Track Example Video)