Cinema 4D / BodyPaint 3D Program Documentation Reference Cinema 4D Cinema 4D Visualize, Broadcast, Studio Motion Tracker
Function available in CINEMA 4D Studio

Motion Tracker Menu

With only a few exceptions, the commands listed here are only available if a Motion Tracker or Object Tracker object is selected. In addition, different commands will be made available depending on the mode - 2D/3D View - and the Tracks selected. Several commands can also be called up via the Motion Tracker Graph’s context menu.

2D View
3D View

These modes will only be made available if a Motion Tracker or Object Tracker object or one of its Child objects is selected. These commands (which can also be assigned keyboard shortcuts) can be used to quickly switch between modes:

The 2D View mode is indicated by a yellow frame.

Full Solve

This command does the following:

The Full Solve command does everything you would normally do manually in the Motion Tracker object’s Footage, 2D Tracking and Reconstruction menus.

If you’re lucky you will end up with a fully functioning 3D reconstruction (i.e., a reconstructed animated camera as a Child object of the Motion Tracker object). However, this is only the case for footage that is easy to track. In most cases you will have to do some manual fine-tuning.

If a reconstructed camera is not generated at the end of the process, this is primarily a result of bad Tracks. These can be corrected and/or added manually (see What are good and bad Tracks?). After the Tracks have been modified you will have to execute the Full Solve command again or click on the Run 3D Solver button in the Motion Tracker’s Reconstruction tab.

If you take a look at the status bar and it reads "Deferred Solve Finished”, the solve was successful (see also 3D Reconstruction).

If you have completed one or more of the steps listed above, the command will continue with the next step (select the partially solved Motion Tracker object to do so).

Create User Tracks

User Tracks are normally created by pressing Ctrl/Cmd on the footage. You can also use the Create User Tracks tool, which bears the advantage of a magnifying glass also being displayed. Not hotkey must be used.

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Lock View on Tracks

This command makes it possible to visually check the quality of a Track better than than usual.

Select one or more Tracks and enable this mode. Where the 2D Track was successfully tracked, it will remain fixated in the Viewport or with its position until the mode is disabled.

When the footage is played or if a different time is selected, the footage view under the Track will move instead. Tracks will remain stationary and cannot disappear from view when played. Slipping and jumping Tracks can be easily localized.

All known interactive editing methods, such as moving a keyframe or adding a new Track also work in this mode.

If you make additional selections, simply click on the button again. If you do this without previously making a new selection, the mode will be disabled.

Auto Update Tracks

This mode is enabled by default and ensures that a new 2D tracking (in both directions) is created immediately for newly modified Tracks (e.g., after a corrective nudge, change of pattern or search size, etc.).

If this mode is disabled, changes can be made quickly without always having to wait until 2D Tracking has been completed. You can then track manually by clicking on the respective buttons in the Motion Tracker object. Here, tracking is only possible either forwards or backwards.

If the Auto Update Tracks option is enabled again, a new tracking will start immediately. Modified Tracks that have not yet been retracked will be colored accordingly.

Selections

All selection commands described below only work in 2D View mode and affect the selected Tracks.

Select All Auto Tracks

Selects all Auto Tracks and ignores all User Tracks.

Select All User Tracks

Selects all User Tracks and ignores all Auto Tracks.

Select Reconstructed Tracks

This command is only available if a 3D reconstruction has successfully been performed. All Tracks that were successfully reconstructed as a 3D feature will be selected.

Invert Selection

Inverts the selection: selected Tracks will be deselected and vice-versa.

Hide Selected

Hides selected Tracks. These tracks still exist, will be evaluated during reconstruction - but are merely not visible. This can, for example, be useful if you want to hide Auto Tracks so you can concentrate working on the User Tracks.

Hide Unselected

Hides all unselected Tracks.

Unhide All

All hidden Tracks will be unhidden.

Invert Visibility

Inverts the state of visibility: visible Tracks will be hidden and vice-versa.

Delete Selected

Deletes all selected Tracks (these can be restored using the next command). These Tracks will not be evaluated during 3D reconstruction.

Restore Deleted

The tracks deleted using the previously described command will be restored - and made useable for reconstruction.

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Frame All Tracks

Here, the footage will be scaled and moved so all Tracks are visible.

Frame Selected Tracks

This command moves and scales the footage so the selected Track is visible at the center of the section. This is particularly useful if a Track is selected in the Motion Tracker Graph and you want to edit it in the view.

This command also works if multiple Tracks are selected. The footage will then be moved/scaled so all selected Tracks are displayed as large as possible.

Nudge Track Up
Nudge Track Down
Nudge Track Left
Nudge Track Right

Use these commands to fine-tune Tracks. A single selected Track can be nudged by 1 pixel in the respective direction. If no keyframe had already been set, one will be created automatically. The Ctrl/Cmd + arrow combination will do the same.

Track Bidirectional

This command tracks all selected, untracked Tracks in both directions starting from the current frame (see also Manual Tracking). If no Tracks are selected, all untracked Tracks will be tracked. If no Tracks exist, Tracks will be created automatically and subsequently tracked.

Track Forward
Track Backward

This command tracks all selected, untracked Tracks forwards, resp. backwards from the current frame (see also Manual Tracking). If no Tracks exist, Tracks will be created automatically and subsequently tracked.

Insert Key at Track Position

This command inserts a key for selected, tracked Tracks at the current position in the animation. This is recommended for Tracks that shift. Execute the command at the Track’s last correct position. The Motion Tracker will save this pixel pattern and will search for this pattern in the next (new) frame.

This command differs from the context menu’s Add key here command.

Remove Key

This command deletes all keys for the selected Tracks at this point in the animation (which are displayed as a small point on the Track path as well as in the Animation Palette for the Track - where they cannot be deleted).

It is important to note that Track keys can only be deleted using this command (even if the keys are also displayed at other locations such as in the Timeline).

Trim Track

Tracks whose pixel patterns move out of the footage or become too blurred (or can no longer be tracked for other reasons) but are still erroneously tracked at another position can be trimmed using this command. The Motion Tracker will be told when to stop tracking. Go to the last correctly positioned Track and execute the Trim Track command. The side showing away from the key will be trimmed. If you trim 2 keys, a gap will first appear that can be enlarged by additional trimming (e.g., to mask a tree hushing through the scene).

A trimmed Track path will be indicated in the Viewport by a small, vertical line (see image for next command) an marked in the Motion Tracker Graph by a gray key.

A Track can be trimmed twice per key. If you want to delete a path between 2 keys completely, select the key in front of the key to be deleted, execute the Trim Track command, then select the key next to the next key and execute the command again. The path between the two keys will then be deleted.

Untrim Track

Track paths deleted using the previous command that are no longer than 3 frames can be untrimmed using this command. Note that a Track path can be trimmed at both ends.

Context menu

Most of the commands described above will be made available if you right-click in the Viewport. The following will also be made available:

Create User Track Here

A User Track is created at this location (it must subsequently be tracked). A faster method is to Ctrl/Cmd+click on the footage.

Insert Key Here

A key can be created at the current position for an existing Track path (see also What are Tracks?). This defines the existing Track path as faulty and a new position is defined. This is always recommended if a Track has jumped to a faulty pixel pattern. A new 2D Tracking will automatically take place.

You can also drag the selected Track to a new position.

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Assign Selected

Here you can assign selected Tracks to an existing Object Tracker. The Assign Selected option is located in the Object Tracker’s Trackers menu.