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Trajectory Board ​

The trajectory board lets you draw a movement path by hand and reference it directly in your prompt, so the generated motion follows your drawn path precisely rather than relying on the model to infer a path from text alone.

Open the Board ​

Open the board using the floating trajectory board icon in the upper-right corner of the 3D viewer.

Draw a Trajectory ​

The board represents a 10 × 10 meter ground area (1 grid square = 1 meter). To draw a path, press and drag on the board. Your pointer movements are recorded in real time as a hand-drawn path, which is submitted as a trajectory when you release.

You can draw multiple trajectories on the same board; each is assigned a distinct color to help distinguish them. You can also expand the board for more precise drawing.

Each drawn trajectory is listed below the canvas with its reference ID, number of path points, and a button for deleting it.

Reference a Trajectory in a Prompt ​

Each drawn trajectory receives an automatically generated ID displayed as @traj-xxxx (for example, @traj-aXqP). To make the generated motion follow that path, simply mention it with @ in your prompt.

Typing @ in the chat input opens an autocomplete list of drawn trajectories. Select one (or continue typing its ID) to insert the reference into your prompt. For example:

"Following trajectory @traj-aXqP, a person walks forward."

Only trajectories actually mentioned with @ in the message are sent along with the prompt. Trajectories that have been drawn but not mentioned have no effect.

Draw Trajectories with a Loaded Scene ​

If you want the generated motion to move through a specific environment, such as walking down a hallway, avoiding furniture, or staying within a room, first import that 3D scene into the viewer. After you import the scene, the trajectory board displays a top-down snapshot of it as the board's background, with coordinates matching the ground coordinates in the 3D viewer. This lets you draw trajectories that truly fit the scene layout instead of drawing blindly on an empty grid.