Build performant 3D web experiences with React Three Fiber (R3F), drei, and Three.js — scenes, models, materials, lighting, camera controls, and post-processing, integrated cleanly into a Next.js/React app. Use whenever the user mentions "3D", "Three.js", "React Three Fiber", "R3F", "WebGL", 3D product viewers, 3D hero sections, GLTF/GLB models, or wants an immersive/interactive 3D web experience. Always check performance implications (draw calls, bundle size, mobile fallback) as part of this skill.