3D Film Reel

Film Reel is a multi-frame editing interface designed to help annotators view and refine a cuboid across the entire sequence - frame by frame. Film Reel enables targeted, manual control over annotations without the need to scroll through every frame linearly. This tool is especially useful for tracking, correcting, or validating object behavior over time. It is both fast and good - accelerating annotation while increasing precision and reducing visual clutter.

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Use Case

• Adjusting object position, rotation, or size across multiple frames for moving vehicles, machinery, or people.

• Manually correcting misaligned cuboids that were interpolated or auto-propagated across a sequence.

• Quickly deleting frame-specific cuboids during review without leaving the multi-frame context.

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Benefits

• Fast: Speeds up multi-frame review and editing by consolidating cuboid views in a single timeline interface.

• Good: Encourages accurate frame-level edits and reduces errors in object tracking or motion representation.

• Lean: Minimizes context switching between views or frames, improving efficiency with minimal overhead.

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Steps to Use Film Reel

1

Select a cuboid

Select a cuboid on the current frame.

2

Open Film Reel

Click on the Film Reel icon to open the grid-view mode.

3

View cuboid across frames

A panel appears showing the cuboid's state across all frames where it exists.

4

Activate editing mode

Click a frame cell to activate editing mode.

• A blue border appears.

5

Edit and create keyframe

You can now edit position, dimensions, or angle.

• A keyframe is created, the cell's badge turns blue, and a blue line appears under the frame in the timeline.

6

Exit edit mode

Press Esc to exit edit mode; the blue border disappears.

7

Review frames

You can scroll across frames within the Film Reel to review all appearances.

8

Delete specific frame cuboids

Use the trash icon to quickly delete a cuboid from a specific frame.