WebGL 2 Tutorial — What's Different from WebGL 1
WebGL 2 brings instanced rendering, transform feedback, MRT, and modern GLSL ES 3.0 — what changes if you're moving from WebGL 1.
WebGL 2 has been stable in browsers since 2017 but adoption was slow because Three.js abstracted the difference. Sredinom 2026, WebGL 2 is the default in modern Three.js (auto-fallback to WebGL 1 only on truly old devices). Notable additions: instanced rendering (draw 10,000 cubes in one call), transform feedback (GPU-side particle systems), multiple render targets (deferred rendering), GLSL ES 3.0 (modern shader features). For most application code in Three.js, you won't notice the difference — Three.js handles version detection. For shader work, GLSL ES 3.0 syntax (`in/out` instead of `attribute/varying`) is worth learning.
Further reading
Three resources I recommend after this guide: the official Three.js fundamentals docs (excellent and underused), Bruno Simon's Three.js Journey (paid, comprehensive), and the React Three Fiber docs if you'll work in React. Beyond that, reading other developers' source on GitHub — search for 'three-js portfolio' on GitHub trending — accelerates learning faster than any tutorial.
Prerequisites
Before starting on webgl 2 tutorial, you need: a JavaScript baseline (familiarity with ES modules, async/await, npm), a working local dev environment (Node 18+, a code editor), and a basic mental model of what WebGL renders. You don't need 3D modeling skills — for most tutorials, the assets are provided. Time investment: 2-4 hours of focused work for the basic version.
Step-by-step outline
Step 1: scaffold the project (Vite + Three.js). Step 2: get a basic scene rendering — camera, light, geometry. Step 3: load the asset (glTF). Step 4: hook up animation timeline (GSAP or built-in). Step 5: add interactivity (click, scroll). Step 6: optimize for mobile (device-tier check, asset compression). Step 7: deploy. Each step builds on the previous; skipping leads to confusion later.
Common pitfalls
Three failure modes I see beginners hit: (1) trying to render before assets finish loading — always wait for the loader callback, (2) using full-resolution textures on mobile — always have KTX2 or compressed alternatives, (3) leaving the scene rendering when off-screen — pause the render loop with IntersectionObserver. Each pitfall has a clear fix; the trick is recognizing the symptom.
Frequently asked questions
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