# 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.

- Skill: `newmindsgroup/threejs-geometry` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add newmindsgroup/threejs-geometry`
- Raw SKILL.md: https://api.skillmd.com/api/skills/newmindsgroup/threejs-geometry/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: newmindsgroup (https://skillmd.com/u/newmindsgroup)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/newmindsgroup/threejs-geometry

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# Three.js 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.

## When to Use
- You need to create or optimize geometry in Three.js.
- The task involves built-in shapes, custom `BufferGeometry`, vertices, or instanced rendering.
- You are working on mesh structure rather than scene setup or materials alone.

## Core Workflow
1. Confirm the request matches this skill's trigger, scope, and risk profile.
2. Use the topic map to identify the relevant pattern, checklist, or example before writing detailed guidance or code.
3. Load `references/full-guidance.md` when implementation details, examples, anti-patterns, validation checks, or edge cases are needed.
4. Apply only the relevant guidance instead of loading or repeating the entire reference by default.
5. Verify the result against any validation checks, limitations, security notes, or platform constraints in the reference.

## Topic Map
- Quick Start
- Built-in Geometries
- Basic Shapes
- Advanced Shapes
- Path-Based Shapes
- Text Geometry
- BufferGeometry
- Custom BufferGeometry
- BufferAttribute Types
- Modifying BufferGeometry
- Interleaved Buffers (Advanced)
- EdgesGeometry & WireframeGeometry
- Points
- Lines
- InstancedMesh
- Update Instance at Runtime
- InstancedBufferGeometry (Advanced)
- Geometry Utilities

## Reference Map
- `references/full-guidance.md` preserves the complete original guidance, including examples and detailed edge cases.

## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.

## Progressive Loading
Keep this `SKILL.md` as the compact routing and workflow entrypoint. Load the reference file only when the user task requires the deeper implementation material.