WebGL Context Lost — Detection and Recovery
WebGL context-lost errors crash the canvas — handle them gracefully by listening to the contextlost event and re-uploading resources.
WebGL context lost happens when the GPU resets — usually triggered by GPU memory exhaustion (loading too many textures), driver crash, or tab being inactive too long on mobile. The canvas goes blank, all GL resources are invalidated. Recovery: listen to canvas.addEventListener("webglcontextlost", e => e.preventDefault()) to allow recovery, then on "webglcontextrestored" event re-upload textures, recompile shaders, recreate buffers. Three.js handles this automatically since v0.155 if you opt-in via renderer.debug.checkShaderErrors. Pattern that ships: store all GPU resources behind a class that can rebuild from JS-side state, recovery becomes "rebuild scene from source of truth".
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.
Want a faster path
If your timeline is short and the project matters commercially, hiring an experienced developer often beats self-learning by 4-6 weeks of effort. I take on WebGL Context Lost — Detection and Recovery projects on a fixed-price basis — you get the working result without the learning detour. Reach out via the contact page if a structured engagement makes sense for what you're building.
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.
Frequently asked questions
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