What problem does it solve? Building React applications that combine 3D scenes, animation systems, and AI-generated assets involves scattered decisions: where components belong in Feature-Sliced Design, which fal.ai model endpoints are actually live and correctly spelled, how to keep API keys server-side, and how to control generation costs. This Skill encodes verified endpoint IDs, placement rules, and a mandatory backend pipeline so these decisions are made correctly the first time. ## Core Features & Use Cases - Verified fal.ai model catalog: Current endpoint IDs and prices for 3D models (Hyper3D Rodin, Hunyuan3D, TRELLIS), images (FLUX schnell, FLUX.2 Pro), video (Wan, Kling, Veo 3.1), plus a two-route verification method with positive and negative controls to avoid dead or deprecated endpoints. - FSD placement rules: A decision matrix mapping 3D widgets, generation features, fal API clients, and motion tokens to the correct Feature-Sliced Design layers, with cross-slice import rules. - Mandatory backend pipeline: Every fal route must run Zod validation, cache lookup, fal call, optimization (Draco/KTX2 via gltf-transform), R2 upload, and cache write, with rate limiting to prevent cost explosions. - Motion token system: Duration, easing, and spring tokens with LazyMotion strict mode and reduced-motion handling. - Use Case: A developer asked to add a hero 3D scene with AI-generated textures to a landing page gets the correct widget placement, a verified text-to-3D endpoint, a cost estimate, and a complete backend route structure instead of guessing. ## Quick Start Ask the assistant to build a hero 3D scene with an AI-generated model and textures for your React TypeScript project using this skill.