A trajectory is a line that shows the path traveled by a selected object across a selected interval
Tools for switching Trajectory rendering modes can be found on the UI panel at the top
1. Show parent trajectories selected
If you select a group object, trajectory will be rendered only for the highest one in the object hierarchy
2. Show all trajectories selected
If you want to show trajectories for every selected point controller or object, choose this option
3. Show edges trajectories selected
If this option is enabled, trajectories will show the positions of edges connecting selected point controllers.
4. Show objects and edges trajectories selected
This mode shows positions on the selected point controllers and edges that connect them
Point controllers are shown as green points. In the current frame, they are marked with yellow circles
5. Only key frames
In this mode, you will see trajectories of the selected point controllers in the keyframes.
This option is used for fixing trajectories. Unlike a regular trajectory, a fixed trajectory remains visible in the Viewport even when you deselect corresponding objects, disappearing only when the Trajectory fixing mode button is disabled.
This feature can work in several modes:
1. Fix all trajectories
This button fixes trajectories for every selected controllers
2. Fix trajectories edges
This button fixes positions of the edges connecting selected controllers (similar to the Show edges trajectories selected option)
3. Fix edges and trajectories
This button fixes the position of both controllers and edges that connect them
To edit a trajectory you need to enable the Trajectory edit mode button. After this, you can move, rotate and otherwise adjust any point of a trajectory by applying standard manipulators.
Note: If you edit a trajectory for one or more frames in an interpolation interval, the interpolation mode for this interval will be switched to Fixed
Press this button so trajectories won’t disappear when you select another interval