Cinematics and Sequencer

# CHAPTER 16

Cinematics and Sequencer #

1. Introduction #

2. Learning Objectives #

• Understand the Sequencer interface and timeline.

• Create and manipulate a Cinematic Camera (CineCameraActor).

• Understand Focus, Aperture, and Depth of Field.

• Animate an Actor's Transform using Keyframes.

• Use the Camera Cuts track to switch between multiple cameras.

3. What is Sequencer? #

• You create a Level Sequence asset in your Content Browser and open it.

• You drag Actors (like a Camera, a Character, or a Light) from your level into the Sequencer timeline.

• You manipulate their properties over time to create a movie.

4. The CineCameraActor (The Hollywood Lens) #

• This camera accurately simulates real-world physical lenses.

• Sensor Size: You can set it to a 35mm film sensor or a 16:9 digital sensor.

• Focal Length: Set to 12mm for a wide, distorted angle, or 85mm for a flat, cinematic portrait.

• Aperture (f-stop) & Focus: Lower the f-stop (e.g., f/1.4) to create shallow "Depth of Field," where the subject is sharp but the background is beautifully blurry (Bokeh). You must manually keyframe the Focus Distance to keep a moving character sharp.

5. Keyframe Animation #

1. 1. Move the timeline playhead to 00:00.

1. 2. Move a spaceship Actor to the left side of the screen. Press the + icon next to its Transform track in Sequencer to drop a Keyframe.

1. 3. Move the timeline playhead to 05:00.

1. 4. Move the spaceship to the right side of the screen. Drop another Keyframe.

1. 5. Hit Play. The spaceship flies across the screen!

6. The Camera Cuts Track (The Editor) #

• You place three different Cameras in your scene (e.g., Wide Shot, Close-Up, Over-the-Shoulder).

• You drag all three into Sequencer.

• You add a Camera Cuts Track.

• On this track, you tell the Sequencer: "Show Camera 1 for 3 seconds, then instantly cut to Camera 2 for 2 seconds, then cut to Camera 3." This is how you edit a scene.

7. Visual Learning: The Sequencer Timeline #

[ Timeline: 0s --------- 1s --------- 2s --------- 3s --------- 4s ]

[ Camera Cuts Track ]
|=== Cam_Wide (0-2s) ===|=== Cam_CloseUp (2-4s) ===|

[ CineCameraActor_Wide ]
   Transform: [Key]--------------------------------[Key] (Camera pans left)
   Focus Dist:[Key]--------------------------------[Key] (Pulls focus)

[ BP_Hero_Character ]
   Animation: |== Play Walk Cycle ==|== Play Stop Anim ==|

8. Best Practices #

• Use Subsequences for Complex Scenes: If you have a 5-minute opening cutscene, do not put it all on one massive timeline. Break it into 5 individual 1-minute Sequences (Shot 1, Shot 2, etc.), and then nest them inside one "Master Sequence." This prevents the timeline from becoming an unmanageable mess and allows multiple artists to work simultaneously.

9. Common Mistakes #

• Forgetting to Spawn the Sequence: You created a beautiful cutscene, but when you press 'Play' to test your game, nothing happens. A Level Sequence does not play automatically. You must either check the "Auto Play" box in its Details panel in the level, or use a Blueprint (e.g., Create Level Sequence Player -> Play) to trigger the cutscene when the player walks into a room.

10. Mini Project: Animate a Camera Fly-Through #

1. 1. Right-click Content Browser -> Cinematics -> Level Sequence. Name it Seq_Intro.

1. 2. Open it. Click the Camera icon on the Sequencer toolbar to automatically create a CineCameraActor and set it as the current view.

1. 3. Move the timeline playhead to 00:00.

1. 4. In the Viewport, fly the camera high up in the air looking down at your level.

1. 5. In Sequencer, click the + next to the camera's Transform track to set a keyframe.

1. 6. Move the playhead to 05:00 (5 seconds).

1. 7. In the Viewport, fly the camera down to the ground, stopping right in front of a building.

1. 8. Click + to set a second Transform keyframe.

1. 9. Hit Play in Sequencer. You have just animated a professional camera crane sweep!

11. Practice Exercises #

1. 1. Define the purpose of a "Keyframe" in timeline animation.

1. 2. What is Depth of Field, and which camera setting (Aperture/f-stop or Focal Length) controls how blurry the background is?

12. MCQs with Answers #

13. Interview Questions #

• Q: Explain the difference between a standard Camera Component and a CineCameraActor. Why is the latter required for Virtual Production and AAA cutscenes?

• Q: Walk me through the process of taking control of the player's camera to play a cutscene, and then returning control to the player when the cutscene ends using Blueprints.

• Q: What is "Interpolation" in relation to Keyframes? How do you change a camera movement from a "smooth curve" to a "linear rigid stop"?

14. FAQs #

15. Summary #

16. Next Chapter Recommendation #