threejs-geometries
three.js geometry authoring: BufferGeometry, typed BufferAttribute and interleaved layouts, InstancedBufferGeometry, primitive Geometries (box/sphere/torus/etc.), ExtrudeGeometry and Shape/Path/Curve from Extras, WireframeGeometry, and addon geometries such as TextGeometry, DecalGeometry, RoundedBoxGeometry. Use when building custom buffer geometries, extruding shapes, or using primitive geometry constructors; for animation morph targets see threejs-animation; for merging buffers see BufferGeometryUtils addon.
Best use case
threejs-geometries is best used when you need a repeatable AI agent workflow instead of a one-off prompt. It is especially useful for teams working in multi. three.js geometry authoring: BufferGeometry, typed BufferAttribute and interleaved layouts, InstancedBufferGeometry, primitive Geometries (box/sphere/torus/etc.), ExtrudeGeometry and Shape/Path/Curve from Extras, WireframeGeometry, and addon geometries such as TextGeometry, DecalGeometry, RoundedBoxGeometry. Use when building custom buffer geometries, extruding shapes, or using primitive geometry constructors; for animation morph targets see threejs-animation; for merging buffers see BufferGeometryUtils addon.
three.js geometry authoring: BufferGeometry, typed BufferAttribute and interleaved layouts, InstancedBufferGeometry, primitive Geometries (box/sphere/torus/etc.), ExtrudeGeometry and Shape/Path/Curve from Extras, WireframeGeometry, and addon geometries such as TextGeometry, DecalGeometry, RoundedBoxGeometry. Use when building custom buffer geometries, extruding shapes, or using primitive geometry constructors; for animation morph targets see threejs-animation; for merging buffers see BufferGeometryUtils addon.
Users should expect a more consistent workflow output, faster repeated execution, and less time spent rewriting prompts from scratch.
Practical example
Example input
Use the "threejs-geometries" skill to help with this workflow task. Context: three.js geometry authoring: BufferGeometry, typed BufferAttribute and interleaved layouts, InstancedBufferGeometry, primitive Geometries (box/sphere/torus/etc.), ExtrudeGeometry and Shape/Path/Curve from Extras, WireframeGeometry, and addon geometries such as TextGeometry, DecalGeometry, RoundedBoxGeometry. Use when building custom buffer geometries, extruding shapes, or using primitive geometry constructors; for animation morph targets see threejs-animation; for merging buffers see BufferGeometryUtils addon.
Example output
A structured workflow result with clearer steps, more consistent formatting, and an output that is easier to reuse in the next run.
When to use this skill
- Use this skill when you want a reusable workflow rather than writing the same prompt again and again.
When not to use this skill
- Do not use this when you only need a one-off answer and do not need a reusable workflow.
- Do not use it if you cannot install or maintain the related files, repository context, or supporting tools.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/threejs-geometries/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How threejs-geometries Compares
| Feature / Agent | threejs-geometries | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
three.js geometry authoring: BufferGeometry, typed BufferAttribute and interleaved layouts, InstancedBufferGeometry, primitive Geometries (box/sphere/torus/etc.), ExtrudeGeometry and Shape/Path/Curve from Extras, WireframeGeometry, and addon geometries such as TextGeometry, DecalGeometry, RoundedBoxGeometry. Use when building custom buffer geometries, extruding shapes, or using primitive geometry constructors; for animation morph targets see threejs-animation; for merging buffers see BufferGeometryUtils addon.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
## When to use this skill
**ALWAYS use this skill when the user mentions:**
- Building or modifying `BufferGeometry`, attributes, index buffers, draw ranges
- Instancing via `InstancedBufferAttribute` / `InstancedMesh` geometry side (**threejs-objects** for mesh wrapper)
- Extruding `Shape` along paths, `TubeGeometry`, `LatheGeometry`, `ExtrudeGeometry`
- Text or decal addon geometries
**IMPORTANT: geometries vs math**
- **threejs-geometries** = GPU-ready triangle data.
- **threejs-math** = `Box3`, `Sphere`, `Ray` tests without mesh topology.
**Trigger phrases include:**
- "BufferGeometry", "BufferAttribute", "ExtrudeGeometry", "Shape", "Curve"
- "几何体", "缓冲几何", "挤出", "文字几何"
## How to use this skill
1. **Choose geometry type** — prefer built-in primitives (`BoxGeometry`, `SphereGeometry`, etc.) when they fit before custom buffers.
2. **Custom BufferGeometry** — create geometry, set `position`, `normal`, `uv`, optional `index`; compute bounding volumes for frustum culling.
3. **Validate normals** — verify normals exist before adding to scene; missing normals break lighting silently.
4. **Instancing** — align instanced attribute divisor/count with `InstancedMesh` patterns in **threejs-objects**.
5. **Extrusion** — build `Shape`/`Path`, extrude or lathe per docs; consult Extras **Curve** family for path sampling.
6. **Addon geometries** — for NURBS, text, decals, follow Addons pages; cite docs instead of copying full APIs.
7. **Dispose** — call `geometry.dispose()` when replacing meshes to avoid GPU memory leaks.
### Example: Custom BufferGeometry with validation
```javascript
import * as THREE from 'three';
// Create a simple triangle with custom BufferGeometry
const geometry = new THREE.BufferGeometry();
const vertices = new Float32Array([
-1, -1, 0, 1, -1, 0, 0, 1, 0
]);
geometry.setAttribute('position', new THREE.BufferAttribute(vertices, 3));
geometry.computeVertexNormals(); // Always compute normals for correct lighting
// Validate: ensure bounding sphere exists for frustum culling
geometry.computeBoundingSphere();
if (!geometry.boundingSphere) {
console.warn('Bounding sphere computation failed — check vertex data');
}
const material = new THREE.MeshStandardMaterial({ color: 0x00ff00 });
const mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
// Cleanup when done
// geometry.dispose(); material.dispose();
```
See [examples/workflow-extrude-shape.md](examples/workflow-extrude-shape.md).
## Doc map (official)
| Docs section | Representative links |
|--------------|----------------------|
| Core | https://threejs.org/docs/BufferGeometry.html |
| Geometries | https://threejs.org/docs/BoxGeometry.html |
| Extrude | https://threejs.org/docs/ExtrudeGeometry.html |
| Shape | https://threejs.org/docs/Shape.html |
## Scope
- **In scope:** Core geometries, buffer core, curve/shape/extrusion workflows, selected addon geometries.
- **Out of scope:** Physics collision mesh baking; full CAD import pipelines.
## Common pitfalls and best practices
- Missing normals break lighting; compute or import consistently.
- Wrong winding order flips faces—check side/culling.
- Huge attribute counts need LOD or simplification (modifiers in addons—mention only if user asks).
## Documentation and version
Primitives and `BufferGeometry` live under [Geometries](https://threejs.org/docs/#Geometries) and [BufferGeometry](https://threejs.org/docs/BufferGeometry.html) in [three.js docs](https://threejs.org/docs/). Curve, `Shape`, and extrusion APIs appear under **Extras** and **Geometries**—Addons **Curves** / **Geometries** document NURBS and text meshes; link those instead of copying long signatures.
## Agent response checklist
When answering under this skill, prefer responses that:
1. Link `BufferGeometry`, a primitive, or `ExtrudeGeometry` / `Shape` as appropriate.
2. Point **instancing** usage to **threejs-objects** for `InstancedMesh` patterns.
3. Point morph targets and tracks to **threejs-animation** when deformation is time-driven.
4. Reference `BufferGeometryUtils` (Addons **Utils**) only by name + docs link when merging/splitting.
5. Emphasize `dispose()` when replacing large custom buffers.
## References
- https://threejs.org/docs/#Geometries
- https://threejs.org/docs/BufferGeometry.html
- https://threejs.org/docs/ExtrudeGeometry.html
## Keywords
**English:** buffergeometry, extrude, shape, path, curve, primitives, instancing, three.js
**中文：** 几何体、BufferGeometry、挤出、Shape、曲线、实例化、three.jsRelated Skills
threejs-webxr
WebXR integration for three.js: WebXRManager and XRManager on the renderer, session initialization patterns, VRButton and ARButton helpers, XRControllerModelFactory and hand model families, XREstimatedLight, XRPlanes, and related addon Webxr utilities. Use for immersive sessions and controller/hand tracking—not for standard desktop camera projection (threejs-camera) or composer post effects (threejs-postprocessing).
threejs-textures
three.js textures: Texture, DataTexture, CubeTexture, CompressedTexture variants, DepthTexture, VideoTexture, CanvasTexture, 3D/array textures, Source; sampling parameters, mipmaps, anisotropy, wrap/mag/min filters; PMREMGenerator in Extras for environment map prefiltering. Use when configuring GPU texture objects and PMREM; for Draco/KTX2 transcoder file paths use threejs-loaders; for material map slots use threejs-materials; for output color pipeline use threejs-renderers.
threejs-scenes
three.js Scene graph root object, linear Fog and exponential FogExp2, Scene.background for solid colors or textures, and high-level environment background concepts that tie to PMREM and loaders in other skills. Use when configuring world container, atmospheric fog, or background; for HDR env map file loading use threejs-loaders; for GPU texture settings after load use threejs-textures; for tone mapping use threejs-renderers.
threejs-renderers
Core rendering pipeline for three.js using WebGLRenderer and WebGPURenderer, canvas sizing, device pixel ratio, color space and tone mapping, output encoding, WebGL/WebGPU render targets, Info statistics, and addon overlay renderers (CSS2D/CSS3D/SVG). Use when tuning the draw loop, performance, or switching WebGPU vs WebGL; for EffectComposer passes use threejs-postprocessing; for XR session lifecycle use threejs-webxr; for shader graphs use threejs-node-tsl.
threejs-postprocessing
Addon screen-space post-processing for three.js using EffectComposer, Pass base class, RenderPass, and stock passes such as UnrealBloomPass, SSAOPass, SSRPass, BokehPass, OutlinePass, FXAAPass/SMAAPass, TAARenderPass, and ShaderPass; references the Shaders addon group for underlying shader modules. Use when building composer chains for bloom, SSAO, or other screen-space effects; not for basic renderer tone mapping alone (threejs-renderers).
threejs-objects
three.js scene graph objects: Object3D transforms and hierarchy, Group, Mesh, InstancedMesh, SkinnedMesh, BatchedMesh, LOD, Line/LineLoop/LineSegments, Points, Sprite, Bone, Skeleton, ClippingGroup; interaction via Raycaster, Layers masks, and EventDispatcher patterns. Use when building scene hierarchies, picking objects with Raycaster, or configuring instanced/skinned meshes; for pure vector math use threejs-math; for skeletal clips use threejs-animation.
threejs-node-tsl
three.js node-based shading: Nodes API surface, NodeMaterial and MeshStandardNodeMaterial-style families, TSL (Three.js Shading Language) entry at TSL.html, WebGPURenderer pairing, and core PostProcessing (class) versus addon EffectComposer at a high level. Use when authoring shaders as graphs, using TSL builtins, compute-oriented nodes, or modern WebGPU pipelines; for classic ShaderMaterial GLSL use threejs-materials; for stock EffectComposer passes use threejs-postprocessing; for WebGLRenderer-only tuning use threejs-renderers.
threejs-math
three.js math library: Vector2/3/4, Matrix3/4, Quaternion, Euler, Color, Box2/Box3, Sphere, Plane, Ray, Line3, Triangle, Frustum, Cylindrical/Spherical coords, MathUtils, and Interpolant base classes; addon math utilities such as OBB, Octree, Capsule, ConvexHull, MeshSurfaceSampler. Use for transforms, intersection tests, and spatial queries; for keyframe interpolation tied to AnimationMixer use threejs-animation; for picking implementation use threejs-objects with Raycaster.
threejs-materials
Classic three.js materials (non-Node): MeshStandardMaterial, MeshPhysicalMaterial, Phong/Lambert/Toon/Basic, Line/Points/Sprite materials, MeshMatcapMaterial, MeshNormalMaterial, depth/distance materials, ShaderMaterial and RawShaderMaterial. Use when tuning PBR maps, transparency, depth write, skinning flags, or writing GLSL in ShaderMaterial; for TSL/NodeMaterial/WebGPU shader graphs use threejs-node-tsl instead.
threejs-loaders
three.js asset I/O using LoadingManager, Cache, FileLoader, image and texture loaders, GLTFLoader with DRACOLoader and KTX2Loader, and common format loaders under Addons; symmetric exporters such as GLTFExporter and texture/buffer exporters. Use when loading or exporting models, HDR, LUT, fonts, or compressed textures; for runtime Texture object parameters after load use threejs-textures; for scene graph placement use threejs-objects.
threejs-lights
three.js lighting: AmbientLight, HemisphereLight, DirectionalLight, PointLight, SpotLight, RectAreaLight, LightProbe, IESSpotLight, ProjectorLight, shadow subtypes, and addon helpers such as RectAreaLightUniformsLib, RectAreaLightTexturesLib, LightProbeGenerator, TiledLighting. Use when configuring direct/indirect light, shadows, probes, or area lights; for IES file loading use threejs-loaders; for node-based light graphs use threejs-node-tsl; for debug helpers use threejs-helpers.
threejs-helpers
Debug and visualization helpers in three.js Core Helpers (AxesHelper, GridHelper, CameraHelper, light helpers, SkeletonHelper, bounding box helpers, PlaneHelper, PolarGridHelper, ArrowHelper) and Addons Helpers (VertexNormalsHelper, VertexTangentsHelper, RectAreaLightHelper, LightProbeHelper, ViewHelper, OctreeHelper, TextureHelper, PositionalAudioHelper, AnimationPathHelper, RapierHelper). Use only for development and editor overlays—not for shipping art; for gizmo-style manipulation use threejs-controls.