camera-systems

SKILL.md

Camera systems

The camera is the player's window; bad camera work makes a good game feel awful. This skill
covers the engine-neutral camera techniques — smooth follow, deadzones, look-ahead, bounds
clamping, third-person orbit with collision, first-person look, and multi-target framing — and
maps them onto each engine's camera node or rig.

When to use

Use when a 2D camera should follow the player smoothly, stay inside the level, lead the
player's motion, or ignore small movements (deadzone).

Use when building a 3D third-person orbit camera (mouse/stick look, collision push-in) or a
first-person look controller, or framing multiple targets at once.

Use to fix camera jitter, snapping, motion sickness, or a camera that shows past the level edge.

When not to use: for the magnitude and trigger of screen shake and impact juice, use
game-feel (this skill exposes the shake offset hook it drives). For the engine's concrete
camera node/component setup, use godot-3d-essentials (Camera3D, environment) or the engine
skill. For player movement itself use the engine movement skill (godot-2d-movement). For
performance of many cameras/render targets, see performance-optimization.

Core workflow

Decide what the camera serves. Platformer (lead the jump, see hazards), top-down (center
with deadzone), third-person (orbit + collision), first-person (look only). The genre sets the
rules.

Follow smoothly and frame-rate independently. Move the camera toward the target with
exponential smoothing or a spring (SmoothDamp), not a fixed lerp(a, b, 0.1) — that 0.1 is
per-frame and changes with frame rate.

Add a deadzone so tiny target movements don't nudge the camera; it only follows once the
target leaves a box/zone. Stops nausea in twitchy games.

Lead the action with look-ahead by offsetting the camera target in the direction of
motion or facing, eased in/out so it doesn't whip.

Clamp to level bounds so the camera never shows outside the playable area; combine with
smoothing so it eases to a stop at the edge.

For 3D, separate look from collision. Orbit via yaw/pitch on a rig; use a spring arm /
ray to pull the camera in when geometry blocks it; clamp pitch.

Update the camera after the target moves. Follow in the late/post step (after movement and
physics resolve) to avoid a one-frame lag jitter.

Verify by moving the target at low and high frame rates, into corners and walls, and at
the level edges; confirm no jitter, no peeking past bounds, smooth stops. Report what you saw.

Patterns

1. Godot 2D built-in follow: smoothing + bounds (don't hand-roll first)

# Godot 4.7 Camera2D. Engine-provided smoothing + hard limits + drag margins.
@onready var cam := $Camera2D
func _ready() -> void:
    cam.make_current()
    cam.position_smoothing_enabled = true
    cam.position_smoothing_speed = 6.0           # higher = snappier; lower = floatier
    cam.limit_left = 0; cam.limit_top = 0        # clamp to the level rect (pixels)
    cam.limit_right = level_width; cam.limit_bottom = level_height
    cam.drag_horizontal_enabled = true           # built-in deadzone via drag margins

2. Frame-rate-independent smooth follow (when you hand-roll it)

# RIGHT: exponential smoothing — same feel at any FPS. `rate` ~ 5..12.
func _follow(dt: float) -> void:
    var t := 1.0 - exp(-rate * dt)               # converges correctly regardless of dt
    global_position = global_position.lerp(target.global_position, t)
# WRONG: global_position = global_position.lerp(target.global_position, 0.1)
#        → faster smoothing at higher FPS; different feel on every machine.
# Unity 6.3 LTS: Vector3.SmoothDamp(transform.position, target.position, ref vel, smoothTime) in
# LateUpdate gives the same spring behavior with built-in frame-rate correction.

3. Deadzone + look-ahead (lead the player, ignore jitter)

# Camera only chases once the target leaves the deadzone box, then aims AHEAD of motion.
func _camera_target(dt: float) -> Vector2:
    var to := target.global_position - _focus
    var dz := deadzone_half_extents                  # e.g. Vector2(48, 32)
    # Only move the focus by the overflow beyond the deadzone (per axis).
    _focus.x += clampf(absf(to.x) - dz.x, 0, INF) * signf(to.x)
    _focus.y += clampf(absf(to.y) - dz.y, 0, INF) * signf(to.y)
    var lead := target.velocity.normalized() * look_ahead_dist    # aim ahead of travel
    return _focus + lead

4. 3D third-person orbit with collision push-in

# Godot 4.7. Yaw/pitch a pivot; a SpringArm3D auto-pulls the camera in when blocked.
func _unhandled_input(e):
    if e is InputEventMouseMotion:
        _yaw -= e.relative.x * sensitivity
        _pitch = clampf(_pitch - e.relative.y * sensitivity, -1.2, 0.4)   # clamp pitch!
func _process(_dt):
    pivot.rotation = Vector3(_pitch, _yaw, 0)
    # $SpringArm3D handles wall collision: set spring_length + collision_mask; the child
    # Camera3D slides in automatically. RIGHT: spring arm. WRONG: camera clips through walls.
# Unity 6.3 LTS: a Cinemachine 3 CinemachineCamera (namespace Unity.Cinemachine) with an Orbital
# Follow + Cinemachine Deoccluder; the CinemachineBrain on the Camera blends automatically.

5. Screen shake hook (owned trigger lives in game-feel)

# Expose an additive offset the game-feel trauma model writes to; follow + shake compose.
var shake_offset := Vector2.ZERO                 # set each frame by game-feel (trauma^2 * noise)
func _apply(final_focus: Vector2) -> void:
    global_position = final_focus + shake_offset  # shake rides ON TOP of smooth follow
# Unity Cinemachine: add a CinemachineBasicMultiChannelPerlin and set amplitude from trauma.

Pitfalls

lerp(pos, target, const) per frame is frame-rate dependent — floatier at 30 FPS, snappier
at 144. Use 1 - exp(-rate*dt) or SmoothDamp.

Following in the normal update before the target has moved yields a one-frame lag jitter.
Follow in LateUpdate / after movement/physics resolve.

No bounds clamp lets the camera show black past the level edge. Clamp focus to the level
rect (account for the viewport half-size so the view, not the center, stays inside).

No deadzone in twitchy games makes the camera twitch with every micro-movement → nausea.

Unclamped pitch in third/first-person flips the camera over the top. Clamp pitch to ~±80°.

Camera clipping through walls in 3D — use a spring arm / occlusion ray to pull in.

Snapping on teleport/respawn is jarring; either hard-cut intentionally (and reset
smoothing) or fast-ease. Don't let a huge SmoothDamp distance whip across the level.

Shake driving the follow target instead of an additive offset makes follow fight shake.
Compose: smooth follow first, add shake offset last.

Per-axis vs radial deadzone confusion — a box deadzone feels different from a circular one;
pick deliberately.

References

For the exponential-smoothing/spring derivation, a complete deadzone+look-ahead+bounds 2D rig,
3D spring-arm/orbit details, first-person look, multi-target/group framing and split-screen,
cinematic camera blends, and the Cinemachine 3 / Godot Camera2D / PhantomCamera mapping, read
references/follow-and-framing.md.

Related skills

game-feel — owns screen-shake trauma/triggers; this skill exposes the offset it writes.

godot-2d-movement, godot-3d-essentials — the player/world the camera frames; Camera3D setup.

physics-tuning — interpolate camera follow with the physics step to kill jitter.

platformer, fps-shooter — genres whose camera rules this skill implements.

performance-optimization — cost of extra cameras, render targets, and split-screen.