Easy demo recording

[mockersf]

Objective

• Followup on Easy screenrecording plugin #21237
• See mockersf/bevy@easy-screenrecording...mockersf:bevy:easy-demo-recording for what's new
• It can be hard to share how to record a demo for a specific feature
• Make it easy

Solution

• Add a dev plugin that can move the camera
• Add plumbing to CI testing to be able to move the camera and control screen recording
• Demo can be configured in code or in a configuration file

Testing

• Add to an example:

let fps = 120; // FPS for the example on your computer

[...]

// Before `DefaultPlugins`:
        .insert_resource(CiTestingConfig {
            events: vec![
                CiTestingEventOnFrame(fps * 1, ci_testing::CiTestingEvent::StartScreenRecording),
                {
                    let transform = Transform::from_xyz(0.7, 0.7, -1.0)
                        .looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y);
                    CiTestingEventOnFrame(
                        fps * 6,
                        ci_testing::CiTestingEvent::MoveCamera {
                            translation: transform.translation,
                            rotation: transform.rotation,
                        },
                    )
                },
                {
                    let transform = Transform::from_xyz(-0.7, 0.7, -1.0)
                        .looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y);
                    CiTestingEventOnFrame(
                        fps * 11,
                        ci_testing::CiTestingEvent::MoveCamera {
                            translation: transform.translation,
                            rotation: transform.rotation,
                        },
                    )
                },
                {
                    let transform = Transform::from_xyz(-0.7, 0.7, 1.0)
                        .looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y);
                    CiTestingEventOnFrame(
                        fps * 16,
                        ci_testing::CiTestingEvent::MoveCamera {
                            translation: transform.translation,
                            rotation: transform.rotation,
                        },
                    )
                },
                {
                    let transform = Transform::from_xyz(0.7, 0.7, 1.0)
                        .looking_at(Vec3::new(0.0, 0.3, 0.0), Vec3::Y);
                    CiTestingEventOnFrame(
                        fps * 21,
                        ci_testing::CiTestingEvent::MoveCamera {
                            translation: transform.translation,
                            rotation: transform.rotation,
                        },
                    )
                },
                CiTestingEventOnFrame(fps * 26, ci_testing::CiTestingEvent::StopScreenRecording),
            ],
            ..default()
        })

• Run the example with --features bevy_internal/screenrecording,bevy_ci_testing
• Lay back, enjoy your demo recording

---

Showcase

load_gltf-1758980570053.h264.mp4

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