Add 260+ Claude Code skills from skills.sh

Complete collection of AI agent skills including: - Frontend Development (Vue, React, Next.js, Three.js) - Backend Development (NestJS, FastAPI, Node.js) - Mobile Development (React Native, Expo) - Testing (E2E, frontend, webapp) - DevOps (GitHub Actions, CI/CD) - Marketing (SEO, copywriting, analytics) - Security (binary analysis, vulnerability scanning) - And many more... Synchronized from: https://skills.sh/ Co-Authored-By: Claude <noreply@anthropic.com>
2026-01-23 18:02:28 +00:00
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+---
+name: threejs-fundamentals
+description: Three.js scene setup, cameras, renderer, Object3D hierarchy, coordinate systems. Use when setting up 3D scenes, creating cameras, configuring renderers, managing object hierarchies, or working with transforms.
+---
+
+# Three.js Fundamentals
+
+## Quick Start
+
+```javascript
+import * as THREE from "three";
+
+// Create scene, camera, renderer
+const scene = new THREE.Scene();
+const camera = new THREE.PerspectiveCamera(
+  75,
+  window.innerWidth / window.innerHeight,
+  0.1,
+  1000,
+);
+const renderer = new THREE.WebGLRenderer({ antialias: true });
+
+renderer.setSize(window.innerWidth, window.innerHeight);
+renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+document.body.appendChild(renderer.domElement);
+
+// Add a mesh
+const geometry = new THREE.BoxGeometry(1, 1, 1);
+const material = new THREE.MeshStandardMaterial({ color: 0x00ff00 });
+const cube = new THREE.Mesh(geometry, material);
+scene.add(cube);
+
+// Add light
+scene.add(new THREE.AmbientLight(0xffffff, 0.5));
+const dirLight = new THREE.DirectionalLight(0xffffff, 1);
+dirLight.position.set(5, 5, 5);
+scene.add(dirLight);
+
+camera.position.z = 5;
+
+// Animation loop
+function animate() {
+  requestAnimationFrame(animate);
+  cube.rotation.x += 0.01;
+  cube.rotation.y += 0.01;
+  renderer.render(scene, camera);
+}
+animate();
+
+// Handle resize
+window.addEventListener("resize", () => {
+  camera.aspect = window.innerWidth / window.innerHeight;
+  camera.updateProjectionMatrix();
+  renderer.setSize(window.innerWidth, window.innerHeight);
+});
+```
+
+## Core Classes
+
+### Scene
+
+Container for all 3D objects, lights, and cameras.
+
+```javascript
+const scene = new THREE.Scene();
+scene.background = new THREE.Color(0x000000); // Solid color
+scene.background = texture; // Skybox texture
+scene.background = cubeTexture; // Cubemap
+scene.environment = envMap; // Environment map for PBR
+scene.fog = new THREE.Fog(0xffffff, 1, 100); // Linear fog
+scene.fog = new THREE.FogExp2(0xffffff, 0.02); // Exponential fog
+```
+
+### Cameras
+
+**PerspectiveCamera** - Most common, simulates human eye.
+
+```javascript
+// PerspectiveCamera(fov, aspect, near, far)
+const camera = new THREE.PerspectiveCamera(
+  75, // Field of view (degrees)
+  window.innerWidth / window.innerHeight, // Aspect ratio
+  0.1, // Near clipping plane
+  1000, // Far clipping plane
+);
+
+camera.position.set(0, 5, 10);
+camera.lookAt(0, 0, 0);
+camera.updateProjectionMatrix(); // Call after changing fov, aspect, near, far
+```
+
+**OrthographicCamera** - No perspective distortion, good for 2D/isometric.
+
+```javascript
+// OrthographicCamera(left, right, top, bottom, near, far)
+const aspect = window.innerWidth / window.innerHeight;
+const frustumSize = 10;
+const camera = new THREE.OrthographicCamera(
+  (frustumSize * aspect) / -2,
+  (frustumSize * aspect) / 2,
+  frustumSize / 2,
+  frustumSize / -2,
+  0.1,
+  1000,
+);
+```
+
+**ArrayCamera** - Multiple viewports with sub-cameras.
+
+```javascript
+const cameras = [];
+for (let i = 0; i < 4; i++) {
+  const subcamera = new THREE.PerspectiveCamera(40, 1, 0.1, 100);
+  subcamera.viewport = new THREE.Vector4(
+    Math.floor(i % 2) * 0.5,
+    Math.floor(i / 2) * 0.5,
+    0.5,
+    0.5,
+  );
+  cameras.push(subcamera);
+}
+const arrayCamera = new THREE.ArrayCamera(cameras);
+```
+
+**CubeCamera** - Renders environment maps for reflections.
+
+```javascript
+const cubeRenderTarget = new THREE.WebGLCubeRenderTarget(256);
+const cubeCamera = new THREE.CubeCamera(0.1, 1000, cubeRenderTarget);
+scene.add(cubeCamera);
+
+// Use for reflections
+material.envMap = cubeRenderTarget.texture;
+
+// Update each frame (expensive!)
+cubeCamera.position.copy(reflectiveMesh.position);
+cubeCamera.update(renderer, scene);
+```
+
+### WebGLRenderer
+
+```javascript
+const renderer = new THREE.WebGLRenderer({
+  canvas: document.querySelector("#canvas"), // Optional existing canvas
+  antialias: true, // Smooth edges
+  alpha: true, // Transparent background
+  powerPreference: "high-performance", // GPU hint
+  preserveDrawingBuffer: true, // For screenshots
+});
+
+renderer.setSize(width, height);
+renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+
+// Tone mapping
+renderer.toneMapping = THREE.ACESFilmicToneMapping;
+renderer.toneMappingExposure = 1.0;
+
+// Color space (Three.js r152+)
+renderer.outputColorSpace = THREE.SRGBColorSpace;
+
+// Shadows
+renderer.shadowMap.enabled = true;
+renderer.shadowMap.type = THREE.PCFSoftShadowMap;
+
+// Clear color
+renderer.setClearColor(0x000000, 1);
+
+// Render
+renderer.render(scene, camera);
+```
+
+### Object3D
+
+Base class for all 3D objects. Mesh, Group, Light, Camera all extend Object3D.
+
+```javascript
+const obj = new THREE.Object3D();
+
+// Transform
+obj.position.set(x, y, z);
+obj.rotation.set(x, y, z); // Euler angles (radians)
+obj.quaternion.set(x, y, z, w); // Quaternion rotation
+obj.scale.set(x, y, z);
+
+// Local vs World transforms
+obj.getWorldPosition(targetVector);
+obj.getWorldQuaternion(targetQuaternion);
+obj.getWorldDirection(targetVector);
+
+// Hierarchy
+obj.add(child);
+obj.remove(child);
+obj.parent;
+obj.children;
+
+// Visibility
+obj.visible = false;
+
+// Layers (for selective rendering/raycasting)
+obj.layers.set(1);
+obj.layers.enable(2);
+obj.layers.disable(0);
+
+// Traverse hierarchy
+obj.traverse((child) => {
+  if (child.isMesh) child.material.color.set(0xff0000);
+});
+
+// Matrix updates
+obj.matrixAutoUpdate = true; // Default: auto-update matrices
+obj.updateMatrix(); // Manual matrix update
+obj.updateMatrixWorld(true); // Update world matrix recursively
+```
+
+### Group
+
+Empty container for organizing objects.
+
+```javascript
+const group = new THREE.Group();
+group.add(mesh1);
+group.add(mesh2);
+scene.add(group);
+
+// Transform entire group
+group.position.x = 5;
+group.rotation.y = Math.PI / 4;
+```
+
+### Mesh
+
+Combines geometry and material.
+
+```javascript
+const mesh = new THREE.Mesh(geometry, material);
+
+// Multiple materials (one per geometry group)
+const mesh = new THREE.Mesh(geometry, [material1, material2]);
+
+// Useful properties
+mesh.geometry;
+mesh.material;
+mesh.castShadow = true;
+mesh.receiveShadow = true;
+
+// Frustum culling
+mesh.frustumCulled = true; // Default: skip if outside camera view
+
+// Render order
+mesh.renderOrder = 10; // Higher = rendered later
+```
+
+## Coordinate System
+
+Three.js uses a **right-handed coordinate system**:
+
+- **+X** points right
+- **+Y** points up
+- **+Z** points toward viewer (out of screen)
+
+```javascript
+// Axes helper
+const axesHelper = new THREE.AxesHelper(5);
+scene.add(axesHelper); // Red=X, Green=Y, Blue=Z
+```
+
+## Math Utilities
+
+### Vector3
+
+```javascript
+const v = new THREE.Vector3(x, y, z);
+v.set(x, y, z);
+v.copy(otherVector);
+v.clone();
+
+// Operations (modify in place)
+v.add(v2);
+v.sub(v2);
+v.multiply(v2);
+v.multiplyScalar(2);
+v.divideScalar(2);
+v.normalize();
+v.negate();
+v.clamp(min, max);
+v.lerp(target, alpha);
+
+// Calculations (return new value)
+v.length();
+v.lengthSq(); // Faster than length()
+v.distanceTo(v2);
+v.dot(v2);
+v.cross(v2); // Modifies v
+v.angleTo(v2);
+
+// Transform
+v.applyMatrix4(matrix);
+v.applyQuaternion(q);
+v.project(camera); // World to NDC
+v.unproject(camera); // NDC to world
+```
+
+### Matrix4
+
+```javascript
+const m = new THREE.Matrix4();
+m.identity();
+m.copy(other);
+m.clone();
+
+// Build transforms
+m.makeTranslation(x, y, z);
+m.makeRotationX(theta);
+m.makeRotationY(theta);
+m.makeRotationZ(theta);
+m.makeRotationFromQuaternion(q);
+m.makeScale(x, y, z);
+
+// Compose/decompose
+m.compose(position, quaternion, scale);
+m.decompose(position, quaternion, scale);
+
+// Operations
+m.multiply(m2); // m = m * m2
+m.premultiply(m2); // m = m2 * m
+m.invert();
+m.transpose();
+
+// Camera matrices
+m.makePerspective(left, right, top, bottom, near, far);
+m.makeOrthographic(left, right, top, bottom, near, far);
+m.lookAt(eye, target, up);
+```
+
+### Quaternion
+
+```javascript
+const q = new THREE.Quaternion();
+q.setFromEuler(euler);
+q.setFromAxisAngle(axis, angle);
+q.setFromRotationMatrix(matrix);
+
+q.multiply(q2);
+q.slerp(target, t); // Spherical interpolation
+q.normalize();
+q.invert();
+```
+
+### Euler
+
+```javascript
+const euler = new THREE.Euler(x, y, z, "XYZ"); // Order matters!
+euler.setFromQuaternion(q);
+euler.setFromRotationMatrix(m);
+
+// Rotation orders: 'XYZ', 'YXZ', 'ZXY', 'XZY', 'YZX', 'ZYX'
+```
+
+### Color
+
+```javascript
+const color = new THREE.Color(0xff0000);
+const color = new THREE.Color("red");
+const color = new THREE.Color("rgb(255, 0, 0)");
+const color = new THREE.Color("#ff0000");
+
+color.setHex(0x00ff00);
+color.setRGB(r, g, b); // 0-1 range
+color.setHSL(h, s, l); // 0-1 range
+
+color.lerp(otherColor, alpha);
+color.multiply(otherColor);
+color.multiplyScalar(2);
+```
+
+### MathUtils
+
+```javascript
+THREE.MathUtils.clamp(value, min, max);
+THREE.MathUtils.lerp(start, end, alpha);
+THREE.MathUtils.mapLinear(value, inMin, inMax, outMin, outMax);
+THREE.MathUtils.degToRad(degrees);
+THREE.MathUtils.radToDeg(radians);
+THREE.MathUtils.randFloat(min, max);
+THREE.MathUtils.randInt(min, max);
+THREE.MathUtils.smoothstep(x, min, max);
+THREE.MathUtils.smootherstep(x, min, max);
+```
+
+## Common Patterns
+
+### Proper Cleanup
+
+```javascript
+function dispose() {
+  // Dispose geometries
+  mesh.geometry.dispose();
+
+  // Dispose materials
+  if (Array.isArray(mesh.material)) {
+    mesh.material.forEach((m) => m.dispose());
+  } else {
+    mesh.material.dispose();
+  }
+
+  // Dispose textures
+  texture.dispose();
+
+  // Remove from scene
+  scene.remove(mesh);
+
+  // Dispose renderer
+  renderer.dispose();
+}
+```
+
+### Clock for Animation
+
+```javascript
+const clock = new THREE.Clock();
+
+function animate() {
+  const delta = clock.getDelta(); // Time since last frame (seconds)
+  const elapsed = clock.getElapsedTime(); // Total time (seconds)
+
+  mesh.rotation.y += delta * 0.5; // Consistent speed regardless of framerate
+
+  requestAnimationFrame(animate);
+  renderer.render(scene, camera);
+}
+```
+
+### Responsive Canvas
+
+```javascript
+function onWindowResize() {
+  const width = window.innerWidth;
+  const height = window.innerHeight;
+
+  camera.aspect = width / height;
+  camera.updateProjectionMatrix();
+
+  renderer.setSize(width, height);
+  renderer.setPixelRatio(Math.min(window.devicePixelRatio, 2));
+}
+window.addEventListener("resize", onWindowResize);
+```
+
+### Loading Manager
+
+```javascript
+const manager = new THREE.LoadingManager();
+
+manager.onStart = (url, loaded, total) => console.log("Started loading");
+manager.onLoad = () => console.log("All loaded");
+manager.onProgress = (url, loaded, total) => console.log(`${loaded}/${total}`);
+manager.onError = (url) => console.error(`Error loading ${url}`);
+
+const textureLoader = new THREE.TextureLoader(manager);
+const gltfLoader = new GLTFLoader(manager);
+```
+
+## Performance Tips
+
+1. **Limit draw calls**: Merge geometries, use instancing, atlas textures
+2. **Frustum culling**: Enabled by default, ensure bounding boxes are correct
+3. **LOD (Level of Detail)**: Use `THREE.LOD` for distance-based mesh switching
+4. **Object pooling**: Reuse objects instead of creating/destroying
+5. **Avoid `getWorldPosition` in loops**: Cache results
+
+```javascript
+// Merge static geometries
+import { mergeGeometries } from "three/examples/jsm/utils/BufferGeometryUtils.js";
+const merged = mergeGeometries([geo1, geo2, geo3]);
+
+// LOD
+const lod = new THREE.LOD();
+lod.addLevel(highDetailMesh, 0);
+lod.addLevel(medDetailMesh, 50);
+lod.addLevel(lowDetailMesh, 100);
+scene.add(lod);
+```
+
+## See Also
+
+- `threejs-geometry` - Geometry creation and manipulation
+- `threejs-materials` - Material types and properties
+- `threejs-lighting` - Light types and shadows