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threejs-camera

Skill9 starsChanged 54 days agoApache-2.0View on GitHub

three.js cameras: Camera base, PerspectiveCamera, OrthographicCamera, CubeCamera, ArrayCamera, StereoCamera; projection matrices, aspect, FOV, orthographic frustum sizes, near/far planes, and dynamic environment maps with CubeCamera. Use when placing views, rendering reflections, or multi-view splits; for XR projections and eye matrices use threejs-webxr; for post pass camera tricks use threejs-postprocessing alongside threejs-renderers.

2 other projects use a version of this.

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The file

We split this skill into the rules it gives an agent

3 rules. About 0 are common, 1 is distinctive, and 2 are very specific to this project.

  • ≈0

    Common · estimate

    Many files like this have a rule of this kind.

  • ≈1

    Distinctive · estimate

    This author's own choices. Worth a look.

  • 2

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Very specific:

    Projection matrix: call updateProjectionMatrix() after parameter edits.

    line 34
  2. Distinctive:

    When answering under this skill, prefer responses that:

    line 68
  3. Very specific:

    Use threejs-helpers CameraHelper for shadow frustum debug when discussing lights.

    line 74

≈ “Common” is an estimate: at least 1 in 5 of the 350,495 skill files we read have a rule of the same kind, not the same words. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

When to use this skill

ALWAYS use this skill when the user mentions:

  • Switching perspective vs orthographic, fov, aspect, zoom, near, far
  • CubeCamera for real-time environment maps or reflections (update rate caveats)
  • ArrayCamera/StereoCamera for multi-view or stereo off-axis projection (non-XR)

IMPORTANT: camera vs webxr vs post

TopicSkill
Standard desktop projectionthreejs-camera
XR reference spaces, IPDthreejs-webxr
Offscreen pass cameras inside composerthreejs-postprocessing

Trigger phrases include:

  • "PerspectiveCamera", "OrthographicCamera", "CubeCamera", "aspect", "near", "far"
  • "透视相机", "正交", "立方体相机"

How to use this skill

  1. Perspective: set aspect = width/height; update on resize (threejs-renderers example workflow).
  2. Orthographic: define left/right/top/bottom in world units for CAD/2.5D views.
  3. Near/far: balance depth precision vs containing scene bounds; relate to fog (threejs-scenes).
  4. CubeCamera: position at reflection probe; call update when scene static enough; use render target outputs per docs.
  5. Stereo/Array: advanced; cite docs for eye parameters; defer XR to threejs-webxr.
  6. Projection matrix: call updateProjectionMatrix() after parameter edits.
  7. Helpers: CameraHelper lives in threejs-helpers.

See examples/workflow-perspective-resize.md.

Doc map (official)

Docs sectionRepresentative links
Cameras (index)https://threejs.org/docs/#Cameras
Camerashttps://threejs.org/docs/Camera.html
Perspectivehttps://threejs.org/docs/PerspectiveCamera.html
Orthographichttps://threejs.org/docs/OrthographicCamera.html
Cubehttps://threejs.org/docs/CubeCamera.html
Multi-viewhttps://threejs.org/docs/ArrayCamera.html
Stereo (non-XR)https://threejs.org/docs/StereoCamera.html

Scope

  • In scope: Core camera classes and parameters; cube/array/stereo overview.
  • Out of scope: WebXR reference spaces, eye matrices, session lifecycle (threejs-webxr); shadow map camera tuning (threejs-lights); pass-internal cameras in composer (threejs-postprocessing).

Common pitfalls and best practices

  • Wrong aspect after resize stretches image—always sync with canvas.
  • Too small near hurts depth precision in large worlds.
  • CubeCamera every frame is expensive—throttle for performance.

Documentation and version

Camera parameters and CubeCamera update behavior follow the Cameras section of three.js docs. WebXR uses different projection paths—hand off to threejs-webxr when the user mentions headsets or reference spaces.

Agent response checklist

When answering under this skill, prefer responses that:

  1. Link PerspectiveCamera, OrthographicCamera, or CubeCamera as relevant.
  2. Pair resize with threejs-renderers setSize / DPR patterns when relevant.
  3. Route XR/WebXRManager questions to threejs-webxr after one-line renderer mention.
  4. Mention updateProjectionMatrix() after intrinsic changes.
  5. Use threejs-helpers CameraHelper for shadow frustum debug when discussing lights.

References

Keywords

English: perspectivecamera, orthographiccamera, cubecamera, projection, aspect, near, far, three.js

中文： 相机、透视、正交、投影、近裁剪、远裁剪、CubeCamera、three.js

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