What is webgl-three.js-deferred-rendering?

brunosimon/webgl-three.js-deferred-rendering — explained in plain English

Analysis updated 2026-07-11 · repo last pushed 2022-06-22

★ 56JavaScriptAudience · developerComplexity · 3/5DormantSetup · easy

Mindmap

mindmap
  root((repo))
    What it does
      Deferred rendering demo
      Forward rendering comparison
      Point light stress test
      Bloom glow effect
    Tech stack
      JavaScript
      Three.js
      Node.js
    Use cases
      Learn deferred rendering
      Prototype complex lighting
      Study real-time graphics
    Audience
      Graphics developers
      Three.js users
      Students
    Features
      Resizable viewport
      Bloom effect
      Fog not implemented
      Reflections not done

mindmap root((repo)) What it does Deferred rendering demo Forward rendering comparison Point light stress test Bloom glow effect Tech stack JavaScript Three.js Node.js Use cases Learn deferred rendering Prototype complex lighting Study real-time graphics Audience Graphics developers Three.js users Students Features Resizable viewport Bloom effect Fog not implemented Reflections not done

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What do people build with it?

USE CASE 1

Learn how deferred rendering works by comparing it side-by-side with forward rendering.

USE CASE 2

Stress test a Three.js scene with dozens of point lights to see performance differences.

USE CASE 3

Use as a reference implementation when building your own deferred rendering pipeline.

USE CASE 4

Study real-time graphics concepts like bloom, surface normals, and light accumulation.

What is it built with?

JavaScriptThree.jsNode.js

How does it compare?

	brunosimon/webgl-three.js-deferred-rendering	mrslimslim/awesome-prompt	andrewrk/mcserve
Stars	56	54	59
Language	JavaScript	JavaScript	JavaScript
Last pushed	2022-06-22	—	2013-04-10
Maintenance	Dormant	—	Dormant
Setup difficulty	easy	moderate	moderate
Complexity	3/5	2/5	3/5
Audience	developer	developer	ops devops

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

Run with standard Node.js tooling, no external services, API keys, or infrastructure required, just install and start.

No license information is provided in the README, so default copyright restrictions apply and the code should be treated as all-rights-reserved.

So what is it?

This project is a technical demo showing off a rendering technique called "deferred rendering" running in a web browser. In simple terms, it's a way to display 3D scenes with many light sources, like glowing lamps or colored point lights, without the performance tanking when you add more lights. In a typical 3D rendering approach (called "forward rendering"), every light in a scene has to be calculated for every surface, which gets expensive fast when you have dozens of lights. Deferred rendering flips this: instead of computing lighting per object, it first captures all the surface information (position, color, direction it's facing) into intermediate layers, then applies all the lights in a single pass. This makes scenes with lots of lights run much more smoothly. The demo includes both approaches so you can compare, along with a "stress test" that throws a bunch of point lights at the scene to see how it holds up. The main audience is developers learning computer graphics, especially anyone working with Three.js (a popular JavaScript library for 3D on the web) who wants to understand or implement deferred rendering themselves. It's essentially a reference implementation paired with a list of learning resources, so someone studying real-time rendering can look at working code alongside tutorials. A game developer prototyping a web-based 3D experience with complex lighting, or a student following along with OpenGL-style graphics courses, would find this useful as a hands-on example. The project is built with JavaScript and Three.js, and you run it locally using standard Node.js tooling. Beyond what the technique checklist shows, point lights, bloom (a glow effect), forward rendering comparisons, and resizing, the README lists several features still marked as not done, including fog, reflections, ambient occlusion, and antialiasing. The README doesn't go into much detail beyond the setup commands and that feature checklist, so anyone diving in should expect to read the linked resources to make sense of the code.

Copy-paste prompts

Prompt 1

Help me set up and run the brunosimon/webgl-three.js-deferred-rendering demo locally. What Node.js commands do I need to run, and how do I switch between deferred and forward rendering modes in the browser?

Prompt 2

I'm looking at the deferred rendering code in this repo. Walk me through how the geometry buffer captures position, color, and normals, and how the lighting pass uses that data to apply dozens of point lights efficiently.

Prompt 3

Explain the difference between forward rendering and deferred rendering using the comparison feature in this Three.js demo. Why does deferred rendering handle the stress test with many point lights better?

Prompt 4

I want to extend this deferred rendering demo to add fog. Based on the existing code structure and the feature checklist, how should I approach implementing fog in the deferred lighting pass?

Frequently asked questions