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threejs-lighting

Configure Three.js light types, shadows, and environment lighting for scenes.

1|1|Updated Mar 30, 2026
Search Tags:#performance#environment#webgl#three.js#lighting#shadows#ibl
One-click install
npx skills add https://github.com/Entelligentsia/skillforge --skill threejs-lighting-entelligentsia
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: threejs-lighting
Source: https://github.com/Entelligentsia/skillforge/tree/main/threejs-skills/skills/threejs-lighting
Command: npx skills add https://github.com/Entelligentsia/skillforge --skill threejs-lighting-entelligentsia

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Realistic and performant lighting in Three.js scenes requires selecting appropriate light types, configuring shadows, and applying environment lighting. This guide consolidates the core lighting concepts and practical tips to help you design visually consistent and efficient scenes.

Core Features & Use Cases

  • AmbientLight for base illumination without direction
  • HemisphereLight for outdoor sky-ground lighting
  • DirectionalLight for sun-like illumination and shadows
  • PointLight and SpotLight for localized lighting and emphasis
  • RectAreaLight for soft, area-based lighting in compatible materials
  • Environment Lighting (IBL) and image-based illumination for realistic reflections
  • Performance tips: shadow map sizing, frustum culling, and avoiding excessive lights

Quick Start

Import THREE and add a basic ambient light and directional light setup to see immediate results.

Frequently Asked Questions about threejs-lighting

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I set up realistic lighting in a Three.js scene?▼

Three.js offers multiple light types for different needs: AmbientLight for base illumination, HemisphereLight for outdoor sky-ground effects, DirectionalLight for sun rays, PointLight and SpotLight for localized emphasis, and RectAreaLight for soft area lighting.

What is the best way to configure shadows in Three.js?▼

The best way to configure shadows in Three.js is using DirectionalLight shadow maps while applying performance tips like proper shadow map sizing and frustum culling. This ensures predictable shadow control without excessive rendering overhead.

How does image-based lighting work in Three.js?▼

Image-based lighting (IBL) in Three.js works by using environment lighting to calculate realistic reflections and ambient diffuse light across your scene. It enables physically accurate material rendering without requiring numerous individual light sources.

Why are my Three.js lighting performance frames dropping?▼

Three.js lighting performance drops are usually caused by excessive lights or unoptimized shadow map sizing. Improve frame rates by applying frustum culling, reducing shadow map resolutions, and limiting the number of active light sources in your scene.

Can I use RectAreaLight for soft lighting in Three.js?▼

Yes, you can use RectAreaLight in Three.js to simulate soft, area-based lighting from rectangular sources like windows or screens. It provides realistic diffuse lighting when paired with compatible physically based materials.

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