threejs-geometry

Three.js geometry creation - built-in shapes, BufferGeometry, custom geometry, instancing. Use when creating 3D shapes, working with vertices, building custom meshes, or optimizing with instanced rendering.

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リポジトリ: kumaran-is/claude-code-onboarding
ソースの最終更新活動: 2026年5月20日 14:14
検出された SKILL.md の言語: 英語
スター: 34
フォーク: 21

インストール方法

デフォルトでは、最初にソースを確認する Prompt が選択されています。直接コマンドに切り替えるか、ローカルコピーをダウンロードすることもできます。

Codex または Claude でインストールこの Prompt をコピーして Codex、Claude、または他のアシスタントに貼り付けると、Skill ページを確認してインストールできます。

直接コマンドでは確認用 Prompt が省略されます。実行前にソースを確認してください。

npx skills add https://github.com/kumaran-is/claude-code-onboarding --skill threejs-geometry

コマンドは1行のまま表示されます。コピー前に横へスクロールして全体を確認してください。

ローカルで確認しますか？SkillsMP が現在取得できるファイルをダウンロードできます。

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SKILL.md

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// Box - width, height, depth, widthSegments, heightSegments, depthSegments
new THREE.BoxGeometry(1, 1, 1, 1, 1, 1);

// Sphere - radius, widthSegments, heightSegments, phiStart, phiLength, thetaStart, thetaLength
new THREE.SphereGeometry(1, 32, 32);
new THREE.SphereGeometry(1, 32, 32, 0, Math.PI * 2, 0, Math.PI); // Full sphere
new THREE.SphereGeometry(1, 32, 32, 0, Math.PI); // Hemisphere

// Plane - width, height, widthSegments, heightSegments
new THREE.PlaneGeometry(10, 10, 1, 1);

// Circle - radius, segments, thetaStart, thetaLength
new THREE.CircleGeometry(1, 32);
new THREE.CircleGeometry(1, 32, 0, Math.PI); // Semicircle

// Cylinder - radiusTop, radiusBottom, height, radialSegments, heightSegments, openEnded
new THREE.CylinderGeometry(1, 1, 2, 32, 1, false);
new THREE.CylinderGeometry(0, 1, 2, 32); // Cone
new THREE.CylinderGeometry(1, 1, 2, 6); // Hexagonal prism

// Cone - radius, height, radialSegments, heightSegments, openEnded
new THREE.ConeGeometry(1, 2, 32, 1, false);

// Torus - radius, tube, radialSegments, tubularSegments, arc
new THREE.TorusGeometry(1, 0.4, 16, 100);

// TorusKnot - radius, tube, tubularSegments, radialSegments, p, q
new THREE.TorusKnotGeometry(1, 0.4, 100, 16, 2, 3);

// Ring - innerRadius, outerRadius, thetaSegments, phiSegments
new THREE.RingGeometry(0.5, 1, 32, 1);

// Capsule - radius, length, capSegments, radialSegments
new THREE.CapsuleGeometry(0.5, 1, 4, 8);

// Dodecahedron - radius, detail
new THREE.DodecahedronGeometry(1, 0);

// Icosahedron - radius, detail (0 = 20 faces, higher = smoother)
new THREE.IcosahedronGeometry(1, 0);

// Octahedron - radius, detail
new THREE.OctahedronGeometry(1, 0);

// Tetrahedron - radius, detail
new THREE.TetrahedronGeometry(1, 0);

// Polyhedron - vertices, indices, radius, detail
const vertices = [1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1];
const indices = [2, 1, 0, 0, 3, 2, 1, 3, 0, 2, 3, 1];
new THREE.PolyhedronGeometry(vertices, indices, 1, 0);

// Lathe - points[], segments, phiStart, phiLength
const points = [
  new THREE.Vector2(0, 0),
  new THREE.Vector2(0.5, 0),
  new THREE.Vector2(0.5, 1),
  new THREE.Vector2(0, 1),
];
new THREE.LatheGeometry(points, 32);

// Extrude - shape, options
const shape = new THREE.Shape();
shape.moveTo(0, 0);
shape.lineTo(1, 0);
shape.lineTo(1, 1);
shape.lineTo(0, 1);
shape.lineTo(0, 0);

const extrudeSettings = {
  steps: 2,
  depth: 1,
  bevelEnabled: true,
  bevelThickness: 0.1,
  bevelSize: 0.1,
  bevelSegments: 3,
};
new THREE.ExtrudeGeometry(shape, extrudeSettings);

// Tube - path, tubularSegments, radius, radialSegments, closed
const curve = new THREE.CatmullRomCurve3([
  new THREE.Vector3(-1, 0, 0),
  new THREE.Vector3(0, 1, 0),
  new THREE.Vector3(1, 0, 0),
]);
new THREE.TubeGeometry(curve, 64, 0.2, 8, false);

import { FontLoader } from "three/examples/jsm/loaders/FontLoader.js";
import { TextGeometry } from "three/examples/jsm/geometries/TextGeometry.js";

const loader = new FontLoader();
loader.load("fonts/helvetiker_regular.typeface.json", (font) => {
  const geometry = new TextGeometry("Hello", {
    font: font,
    size: 1,
    depth: 0.2, // Was 'height' in older versions
    curveSegments: 12,
    bevelEnabled: true,
    bevelThickness: 0.03,
    bevelSize: 0.02,
    bevelSegments: 5,
  });

  // Center text
  geometry.computeBoundingBox();
  geometry.center();

  const mesh = new THREE.Mesh(geometry, material);
  scene.add(mesh);
});

const geometry = new THREE.BufferGeometry();

// Vertices (3 floats per vertex: x, y, z)
const vertices = new Float32Array([
  -1,
  -1,
  0, // vertex 0
  1,
  -1,
  0, // vertex 1
  1,
  1,
  0, // vertex 2
  -1,
  1,
  0, // vertex 3
]);
geometry.setAttribute("position", new THREE.BufferAttribute(vertices, 3));

// Indices (for indexed geometry - reuse vertices)
const indices = new Uint16Array([
  0,
  1,
  2, // triangle 1
  0,
  2,
  3, // triangle 2
]);
geometry.setIndex(new THREE.BufferAttribute(indices, 1));

// Normals (required for lighting)
const normals = new Float32Array([0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1]);
geometry.setAttribute("normal", new THREE.BufferAttribute(normals, 3));

// UVs (for texturing)
const uvs = new Float32Array([0, 0, 1, 0, 1, 1, 0, 1]);
geometry.setAttribute("uv", new THREE.BufferAttribute(uvs, 2));

// Colors (per-vertex colors)
const colors = new Float32Array([
  1,
  0,
  0, // red
  0,
  1,
  0, // green
  0,
  0,
  1, // blue
  1,
  1,
  0, // yellow
]);
geometry.setAttribute("color", new THREE.BufferAttribute(colors, 3));
// Use with: material.vertexColors = true

const positions = geometry.attributes.position;

// Modify vertex
positions.setXYZ(index, x, y, z);

// Access vertex
const x = positions.getX(index);
const y = positions.getY(index);
const z = positions.getZ(index);

// Flag for GPU update
positions.needsUpdate = true;

// Recompute normals after position changes
geometry.computeVertexNormals();

// Recompute bounding box/sphere after changes
geometry.computeBoundingBox();
geometry.computeBoundingSphere();

// Edge lines (only hard edges)
const edges = new THREE.EdgesGeometry(boxGeometry, 15); // 15 = threshold angle
const edgeMesh = new THREE.LineSegments(
  edges,
  new THREE.LineBasicMaterial({ color: 0xffffff }),
);

// Wireframe (all triangles)
const wireframe = new THREE.WireframeGeometry(boxGeometry);
const wireMesh = new THREE.LineSegments(
  wireframe,
  new THREE.LineBasicMaterial({ color: 0xffffff }),
);

// Create point cloud
const geometry = new THREE.BufferGeometry();
const positions = new Float32Array(1000 * 3);

for (let i = 0; i < 1000; i++) {
  positions[i * 3] = (Math.random() - 0.5) * 10;
  positions[i * 3 + 1] = (Math.random() - 0.5) * 10;
  positions[i * 3 + 2] = (Math.random() - 0.5) * 10;
}

geometry.setAttribute("position", new THREE.BufferAttribute(positions, 3));

const material = new THREE.PointsMaterial({
  size: 0.1,
  sizeAttenuation: true, // Size decreases with distance
  color: 0xffffff,
});

const points = new THREE.Points(geometry, material);
scene.add(points);

// Line (connected points)
const points = [
  new THREE.Vector3(-1, 0, 0),
  new THREE.Vector3(0, 1, 0),
  new THREE.Vector3(1, 0, 0),
];
const geometry = new THREE.BufferGeometry().setFromPoints(points);
const line = new THREE.Line(
  geometry,
  new THREE.LineBasicMaterial({ color: 0xff0000 }),
);

// LineLoop (closed loop)
const loop = new THREE.LineLoop(geometry, material);

// LineSegments (pairs of points)
const segmentsGeometry = new THREE.BufferGeometry();
segmentsGeometry.setAttribute(
  "position",
  new THREE.BufferAttribute(
    new Float32Array([
      -1,
      0,
      0,
      0,
      1,
      0, // segment 1
      0,
      1,
      0,
      1,
      0,
      0, // segment 2
    ]),
    3,
  ),
);
const segments = new THREE.LineSegments(segmentsGeometry, material);

const geometry = new THREE.BoxGeometry(1, 1, 1);
const material = new THREE.MeshStandardMaterial({ color: 0x00ff00 });
const count = 1000;

const instancedMesh = new THREE.InstancedMesh(geometry, material, count);

// Set transforms for each instance
const dummy = new THREE.Object3D();
const matrix = new THREE.Matrix4();

for (let i = 0; i < count; i++) {
  dummy.position.set(
    (Math.random() - 0.5) * 20,
    (Math.random() - 0.5) * 20,
    (Math.random() - 0.5) * 20,
  );
  dummy.rotation.set(Math.random() * Math.PI, Math.random() * Math.PI, 0);
  dummy.scale.setScalar(0.5 + Math.random());
  dummy.updateMatrix();

  instancedMesh.setMatrixAt(i, dummy.matrix);
}

// Flag for GPU update
instancedMesh.instanceMatrix.needsUpdate = true;

// Optional: per-instance colors
instancedMesh.instanceColor = new THREE.InstancedBufferAttribute(
  new Float32Array(count * 3),
  3,
);
for (let i = 0; i < count; i++) {
  instancedMesh.setColorAt(
    i,
    new THREE.Color(Math.random(), Math.random(), Math.random()),
  );
}
instancedMesh.instanceColor.needsUpdate = true;

scene.add(instancedMesh);

// Update single instance
const matrix = new THREE.Matrix4();
instancedMesh.getMatrixAt(index, matrix);
// Modify matrix...
instancedMesh.setMatrixAt(index, matrix);
instancedMesh.instanceMatrix.needsUpdate = true;

// Raycasting with instanced mesh
const intersects = raycaster.intersectObject(instancedMesh);
if (intersects.length > 0) {
  const instanceId = intersects[0].instanceId;
}

geometry.computeBoundingBox();
geometry.center(); // Move vertices so center is at origin

geometry.computeBoundingBox();
const size = new THREE.Vector3();
geometry.boundingBox.getSize(size);
const maxDim = Math.max(size.x, size.y, size.z);
geometry.scale(1 / maxDim, 1 / maxDim, 1 / maxDim);

const clone = geometry.clone();
clone.rotateX(Math.PI / 2);
clone.translate(0, 1, 0);
clone.scale(2, 2, 2);

name	threejs-geometry
allowed-tools	Read, Glob
description	Three.js geometry creation - built-in shapes, BufferGeometry, custom geometry, instancing. Use when creating 3D shapes, working with vertices, building custom meshes, or optimizing with instanced rendering.

name	threejs-geometry
allowed-tools	Read, Glob
description	Three.js geometry creation - built-in shapes, BufferGeometry, custom geometry, instancing. Use when creating 3D shapes, working with vertices, building custom meshes, or optimizing with instanced rendering.

threejs-geometry

インストール方法

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