MCPInstall

r3f-geometry

by bbeierle12AI & Agents

BufferGeometry creation, built-in geometries, custom geometry with buffer attributes, instanced meshes for rendering thousands of objects, and geometry manipulation. Use when creating custom shapes, optimizing with instancing, or working with vertex data directly.

Installs
67
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/bbeierle12/skill-mcp-claude --skill r3f-geometry
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads r3f-geometry automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

R3F Geometry

Geometry defines the shape of 3D objects via vertices, faces, normals, and UVs stored in buffer attributes.

Quick Start

// Built-in geometry
<mesh>
  <boxGeometry args={[1, 1, 1]} />
  <meshStandardMaterial />
</mesh>

// Custom geometry
<mesh>
  <bufferGeometry>
    <bufferAttribute
      attach="attributes-position"
      count={3}
      array={new Float32Array([0, 0, 0, 1, 0, 0, 0.5, 1, 0])}
      itemSize={3}
    />
  </bufferGeometry>
  <meshBasicMaterial side={THREE.DoubleSide} />
</mesh>

Built-in Geometries

All geometries accept args array matching constructor parameters:

// Box: [width, height, depth, widthSegments?, heightSegments?, depthSegments?]
<boxGeometry args={[1, 2, 1, 1, 2, 1]} />

// Sphere: [radius, widthSegments, heightSegments, phiStart?, phiLength?, thetaStart?, thetaLength?]
<sphereGeometry args={[1, 32, 32]} />

// Plane: [width, height, widthSegments?, heightSegments?]
<planeGeometry args={[10, 10, 10, 10]} />

// Cylinder: [radiusTop, radiusBottom, height, radialSegments?, heightSegments?, openEnded?]
<cylinderGeometry args={[0.5, 0.5, 2, 32]} />

// Cone: [radius, height, radialSegments?, heightSegments?, openEnded?]
<coneGeometry args={[1, 2, 32]} />

// Torus: [radius, tube, radialSegments, tubularSegments, arc?]
<torusGeometry args={[1, 0.3, 16, 100]} />

// TorusKnot: [radius, tube, tubularSegments, radialSegments, p?, q?]
<torusKnotGeometry args={[1, 0.3, 100, 16]} />

// Ring: [innerRadius, outerRadius, thetaSegments?, phiSegments?]
<ringGeometry args={[0.5, 1, 32]} />

// Circle: [radius, segments?, thetaStart?, thetaLength?]
<circleGeometry args={[1, 32]} />

// Dodecahedron/Icosahedron/Octahedron/Tetrahedron: [radius, detail?]
<icosahedronGeometry args={[1, 0]} />

Buffer Attributes

Geometry data lives in typed arrays attached as attributes:

AttributeItemSizePurpose
position3Vertex positions (x, y, z)
normal3Surface normals for lighting
uv2Texture coordinates (u, v)
color3Per-vertex colors (r, g, b)
index1Triangle indices (optional)

Custom Geometry from Scratch

import { useMemo } from 'react';
import * as THREE from 'three';

function Triangle() {
  const geometry = useMemo(() => {
    const geo = new THREE.BufferGeometry();
    
    // 3 vertices × 3 components (x, y, z)
    const positions = new Float32Array([
      -1, -1, 0,  // vertex 0
       1, -1, 0,  // vertex 1
       0,  1, 0   // vertex 2
    ]);
    
    // 3 vertices × 3 components (nx, ny, nz)
    const normals = new Float32Array([
      0, 0, 1,
      0, 0, 1,
      0, 0, 1
    ]);
    
    // 3 vertices × 2 components (u, v)
    const uvs = new Float32Array([
      0, 0,
      1, 0,
      0.5, 1
    ]);
    
    geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
    geo.setAttribute('normal', new THREE.BufferAttribute(normals, 3));
    geo.setAttribute('uv', new THREE.BufferAttribute(uvs, 2));
    
    return geo;
  }, []);
  
  return (
    <mesh geometry={geometry}>
      <meshStandardMaterial side={THREE.DoubleSide} />
    </mesh>
  );
}

Declarative Buffer Attributes

function Triangle() {
  const positions = useMemo(() => 
    new Float32Array([-1, -1, 0, 1, -1, 0, 0, 1, 0]), 
  []);
  
  return (
    <mesh>
      <bufferGeometry>
        <bufferAttribute
          attach="attributes-position"
          count={3}
          array={positions}
          itemSize={3}
        />
      </bufferGeometry>
      <meshBasicMaterial side={THREE.DoubleSide} />
    </mesh>
  );
}

Indexed Geometry

Use indices to share vertices between triangles:

function Quad() {
  const geometry = useMemo(() => {
    const geo = new THREE.BufferGeometry();
    
    // 4 unique vertices
    const positions = new Float32Array([
      -1, -1, 0,  // 0: bottom-left
       1, -1, 0,  // 1: bottom-right
       1,  1, 0,  // 2: top-right
      -1,  1, 0   // 3: top-left
    ]);
    
    // 2 triangles, 6 indices
    const indices = new Uint16Array([
      0, 1, 2,  // first triangle
      0, 2, 3   // second triangle
    ]);
    
    geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
    geo.setIndex(new THREE.BufferAttribute(indices, 1));
    geo.computeVertexNormals();
    
    return geo;
  }, []);
  
  return (
    <mesh geometry={geometry}>
      <meshStandardMaterial side={THREE.DoubleSide} />
    </mesh>
  );
}

Dynamic Geometry Updates

import { useRef } from 'react';
import { useFrame } from '@react-three/fiber';
import * as THREE from 'three';

function WavingPlane() {
  const geometryRef = useRef<THREE.BufferGeometry>(null!);
  
  useFrame(({ clock }) => {
    const positions = geometryRef.current.attributes.position;
    const time = clock.elapsedTime;
    
    for (let i = 0; i < positions.count; i++) {
      const x = positions.getX(i);
      const y = positions.getY(i);
      const z = Math.sin(x * 2 + time) * Math.cos(y * 2 + time) * 0.5;
      positions.setZ(i, z);
    }
    
    positions.needsUpdate = true;  // Critical!
    geometryRef.current.computeVertexNormals();
  });
  
  return (
    <mesh rotation={[-Math.PI / 2, 0, 0]}>
      <planeGeometry ref={geometryRef} args={[10, 10, 50, 50]} />
      <meshStandardMaterial color="royalblue" side={THREE.DoubleSide} />
    </mesh>
  );
}

Instanced Mesh

Render thousands of identical meshes with different transforms in a single draw call:

import { useRef, useMemo } from 'react';
import { useFrame } from '@react-three/fiber';
import * as THREE from 'three';

function Particles({ count = 1000 }) {
  const meshRef = useRef<THREE.InstancedMesh>(null!);
  
  // Pre-allocate transformation objects
  const dummy = useMemo(() => new THREE.Object3D(), []);
  
  // Initialize instance matrices
  useEffect(() => {
    for (let i = 0; i < count; i++) {
      dummy.position.set(
        (Math.random() - 0.5) * 10,
        (Math.random() - 0.5) * 10,
        (Math.random() - 0.5) * 10
      );
      dummy.rotation.set(
        Math.random() * Math.PI,
        Math.random() * Math.PI,
        0
      );
      dummy.scale.setScalar(0.1 + Math.random() * 0.2);
      dummy.updateMatrix();
      meshRef.current.setMatrixAt(i, dummy.matrix);
    }
    meshRef.current.instanceMatrix.needsUpdate = true;
  }, [count, dummy]);
  
  // Animate instances
  useFrame(({ clock }) => {
    for (let i = 0; i < count; i++) {
      meshRef.current.getMatrixAt(i, dummy.matrix);
      dummy.matrix.decompose(dummy.position, dummy.quaternion, dummy.scale);
      
      dummy.rotation.x += 0.01;
      dummy.rotation.y += 0.01;
      
      dummy.updateMatrix();
      meshRef.current.setMatrixAt(i, dummy.matrix);
    }
    meshRef.current.instanceMatrix.needsUpdate = true;
  });
  
  return (
    <instancedMesh ref={meshRef} args={[undefined, undefined, count]}>
      <boxGeometry args={[1, 1, 1]} />
      <meshStandardMaterial color="hotpink" />
    </instancedMesh>
  );
}

Instance Colors

function ColoredInstances({ count = 1000 }) {
  const meshRef = useRef<THREE.InstancedMesh>(null!);
  
  useEffect(() => {
    const color = new THREE.Color();
    
    for (let i = 0; i < count; i++) {
      color.setHSL(i / count, 1, 0.5);
      meshRef.current.setColorAt(i, color);
    }
    
    meshRef.current.instanceColor!.needsUpdate = true;
  }, [count]);
  
  return (
    <instancedMesh ref={meshRef} args={[undefined, undefined, count]}>
      <sphereGeometry args={[0.1, 16, 16]} />
      <meshStandardMaterial />
    </instancedMesh>
  );
}

Instance Attributes (Custom Data)

function CustomInstanceData({ count = 1000 }) {
  const meshRef = useRef<THREE.InstancedMesh>(null!);
  
  // Custom per-instance data
  const speeds = useMemo(() => {
    const arr = new Float32Array(count);
    for (let i = 0; i < count; i++) {
      arr[i] = 0.5 + Math.random();
    }
    return arr;
  }, [count]);
  
  useEffect(() => {
    // Attach as instanced buffer attribute
    meshRef.current.geometry.setAttribute(
      'aSpeed',
      new THREE.InstancedBufferAttribute(speeds, 1)
    );
  }, [speeds]);
  
  return (
    <instancedMesh ref={meshRef} args={[undefined, undefined, count]}>
      <boxGeometry />
      <shaderMaterial
        vertexShader={`
          attribute float aSpeed;
          varying float vSpeed;
          void main() {
            vSpeed = aSpeed;
            gl_Position = projectionMatrix * modelViewMatrix * instanceMatrix * vec4(position, 1.0);
          }
        `}
        fragmentShader={`
          varying float vSpeed;
          void main() {
            gl_FragColor = vec4(vSpeed, 0.5, 1.0 - vSpeed, 1.0);
          }
        `}
      />
    </instancedMesh>
  );
}

Geometry Utilities

Compute Normals

const geometry = useMemo(() => {
  const geo = new THREE.BufferGeometry();
  // ... set positions
  geo.computeVertexNormals();  // Auto-calculate smooth normals
  return geo;
}, []);

Compute Bounding Box/Sphere

useEffect(() => {
  geometry.computeBoundingBox();
  geometry.computeBoundingSphere();
  
  console.log(geometry.boundingBox);    // THREE.Box3
  console.log(geometry.boundingSphere); // THREE.Sphere
}, [geometry]);

Center Geometry

const geometry = useMemo(() => {
  const geo = new THREE.BoxGeometry(2, 3, 1);
  geo.center();  // Move to origin
  return geo;
}, []);

Merge Geometries

import { mergeGeometries } from 'three/examples/jsm/utils/BufferGeometryUtils';

const merged = useMemo(() => {
  const box = new THREE.BoxGeometry(1, 1, 1);
  const sphere = new THREE.SphereGeometry(0.5, 16, 16);
  sphere.translate(0, 1, 0);
  
  return mergeGeometries([box, sphere]);
}, []);

Performance Tips

TechniqueWhen to UseImpact
Instancing100+ identical meshesMassive
Indexed geometryShared verticesModerate
Lower segmentsNon-hero geometryModerate
Merge geometriesStatic sceneModerate
Dispose unusedDynamic loadingMemory

Disposal

useEffect(() => {
  return () => {
    geometry.dispose();  // Clean up GPU memory
  };
}, [geometry]);

File Structure

r3f-geometry/
├── SKILL.md
├── references/
│   ├── buffer-attributes.md   # Deep-dive on attribute types
│   ├── instancing-patterns.md # Advanced instancing
│   └── procedural-shapes.md   # Algorithmic geometry
└── scripts/
    ├── procedural/
    │   ├── grid.ts            # Grid mesh generator
    │   ├── terrain.ts         # Heightmap terrain
    │   └── tube.ts            # Custom tube geometry
    └── utils/
        ├── geometry-utils.ts  # Merge, center, clone
        └── instancing.ts      # Instance helpers

Reference

  • references/buffer-attributes.md — All attribute types and usage
  • references/instancing-patterns.md — Advanced instancing techniques
  • references/procedural-shapes.md — Generating geometry algorithmically

FAQ

What does the r3f-geometry skill do?

BufferGeometry creation, built-in geometries, custom geometry with buffer attributes, instanced meshes for rendering thousands of objects, and geometry manipulation. Use when creating custom shapes, optimizing with instancing, or working with vertex data directly.

How do I install r3f-geometry?

Run npx skills add https://github.com/bbeierle12/skill-mcp-claude --skill r3f-geometry in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/r3f-geometry/ (personal) or .claude/skills/r3f-geometry/ (project).

Which AI agents can use r3f-geometry?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is r3f-geometry safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains r3f-geometry?

It is published by bbeierle12 in bbeierle12/skill-mcp-claude. It has 67 recorded installs.

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