Shader Troubleshooting — Common Issues
Common shader issues: black screen (compile error), wrong colors (precision), slow on mobile (branching).
Shader troubleshooting: (1) Black screen — usually a compile error, check browser console for shader compile log. (2) Wrong colors on mobile — likely precision issue, check lowp/mediump/highp qualifiers. (3) Slow on mobile but fast on desktop — likely branching (if/else) in fragment shader, replace with step/mix. (4) Compile works but visual is wrong — check varying interpolation, ensure attributes match between vertex/fragment. (5) Texture sampling artifacts — check filtering modes (LinearFilter vs NearestFilter), wrap modes. Tools: Spector.js, browser shader compile log.
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 shader troubleshooting, 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.
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