| name | threejs-camera-direction |
| description | Direct advanced Three.js camera systems. Use for scale-aware chase rigs, thrust lag, side/orbit cameras, body-relative up vectors, quaternion handoffs, authored cinematic framing, floating origins, pointer-look controls, camera collision constraints, projection ownership, and lifecycle restoration. |
Camera Direction
Treat the camera as an authored visual system, not a passive viewport. Compose
the subject, establish scale, choose a stable up frame, and make every mode
handoff explicit.
Build order
- Define the design frame: subject size, screen occupancy, lens, near/far,
motion, and horizon/up convention.
- Build camera targets in semantic frames: ship, body surface, docking axis,
or scene-authored shot.
- Derive position and orientation independently, then combine them once.
- Add input orbit/look only inside declared yaw/pitch and spatial constraints.
- Add frame-rate-independent follow or a bounded spring where the reference
uses inertia.
- Snapshot and restore camera projection/state when a scene owns it.
- Test mode transitions, cuts, pointer-lock reacquisition, resize, and large
coordinates.
Read references/camera-rig-and-cinematic-systems.md
for exact chase/side/orbit rigs, projection values, transition
rules, floating-origin shot, pointer controls, and implementation limits.
Non-negotiable rules
- Use subject dimensions to derive offsets; do not tune one fixed distance for
differently scaled assets.
- For planetary motion, derive up from the dominant body rather than global Y.
- Interpolate position with
lerp and orientation with slerp.
- During an explicit handoff, use one interpolation stage. Do not stack a
transition blend and a second follow smoother over the same interval.
- Re-sync yaw/pitch from the camera when pointer lock is acquired.
- Update the projection matrix whenever FOV, near, far, or aspect changes.
- Keep stars or infinite backgrounds camera-relative when large translation
would create false parallax or precision loss.
- Restore camera and input ownership on scene disposal.
Routing boundary
Use $threejs-procedural-animation for object motion timelines, springs,
docking, staging, and debris. This skill owns how the scene is viewed and how
camera modes hand off.
