Version-sensitive. Every API name, SDK gate and browser-support claim below was verified on 2026-09-08 against primary sources. What against, and when, is in . If that date is old, re-verify before acting on a version number. Three.js & React Three Fiber 3D on the web. Three.js is the engine, R3F is the React renderer. Concise rules here. Deep-dive in . Versions: r187 ( ) · 9.x · 10.x · 3.x. R3F 9 is React 19 only - its declared peer range is / (drei 10 asks ). React 18 projects must stay on R3F 8 + drei 9. Check the installed React major before scaffolding. Renderers: is still R3F's default.…