使用方法
- 复制安装命令，在自己的智能体环境安装前先检查源码包。
- 从原始文档核对所需工具、凭据和支持的宿主。
- 说明输入材料与期望交付物，并对照来源检查输出。
npx skills add https://github.com/cesartevisual/threejs-skills --skill threejs-scene开始前需了解
- 安装不包含模型订阅、API 额度或访问文件的权限。
- 仓库星数和安装量反映活跃情况，不等于独立质量或安全测试。
按源仓库内容呈现，保留标题、案例、代码、表格、链接以及原文引用的演示图片。
Scenes, Cameras, and Math
Use the project's installed versions and existing architecture. These instructions supplement the user's task; they do not authorize unrelated changes or external actions.
Inspect the host element size, renderer ownership, world scale, handedness, up axis, and camera type before changing the scene. Prefer a single renderer for one experience; use viewports/scissors when multiple views genuinely benefit from shared resources.
Separate imported model transforms from interaction pivots using groups. Distinguish local and world coordinates; update world matrices before synchronous bounds or coordinate queries when transforms just changed. Use quaternion interpolation for orientations and reusable vectors in hot paths. Avoid repeatedly converting between Euler angles and quaternions.
Fit a perspective camera against object bounds and both horizontal and vertical field of view; fitting only height can crop a wide subject. Choose a positive near plane and useful far plane for perspective depth precision. Orthographic cameras may use a zero near plane. Update the projection matrix after projection changes.
Size from the canvas container with ResizeObserver, skip zero dimensions, and keep CSS size separate from drawing-buffer size. Apply a deliberate pixel-ratio budget. Update camera, renderer, and size-dependent render targets together. Do not overwrite layout CSS with renderer sizing.
Use one render-loop owner. setAnimationLoop integrates with XR; an existing framework or requestAnimationFrame loop can be valid outside XR. Stop the loop, disconnect observers, remove listeners, and release owned GPU resources on teardown. Renderer disposal alone does not dispose scene resources.
Verify a non-square container, mobile orientation, hidden-to-visible transitions, repeated mounting, and framing of unusually wide or tall assets.
API reference
Consult the official documentation for exact signatures and revision-specific behavior. If documentation access is unavailable, inspect installed types/source and state any remaining uncertainty.
