Three.js Camera — Setup, Controls, Scroll-Driven Movement
The Three.js camera is the user's viewport — getting it right means understanding FOV, aspect, near/far, and how to drive it from scroll or interaction.
Three.js camera setup is one of those small things that separates polished sites from amateur ones. PerspectiveCamera with FOV 50-60 looks natural; FOV 75+ creates fisheye distortion (intentionally on some artistic sites, accidentally on most). Aspect ratio must update on resize. Near/far planes affect depth precision — too wide a range causes z-fighting on close objects. For scroll-driven scenes, I drive camera.position and camera.lookAt() from a GSAP timeline with ScrollTrigger — the camera flies through the scene as the user scrolls, each chapter a different viewpoint. This is the technical core of most premium 3D sites in 2026.
How I work with it
On a typical project, three js camera controls ships as a self-contained module: one entry-point JS file, one CSS file, asset bundle below 1.5MB total. I keep the integration sandboxed so the rest of the site stays SEO-friendly classical HTML. Frame budget targets 60 FPS on a mid-range Android, with a measurable fallback below.
Performance budget
Lighthouse mobile target: 85+ across all categories. I measure on real devices, not just emulator. Asset compression: glTF + Draco for meshes, KTX2 for textures, Brotli for shaders. Lazy-load any three js camera controls scene that isn't above the fold so the first paint stays under 1.5s.
When this is overkill
If the goal is a simple e-commerce listing or content blog, a full three js camera controls setup is overkill — a CSS-driven hero plus static images converts just as well at 1/10 the cost. three js camera controls earns its keep when the brand needs a memorable visual moment or when 3D actually clarifies the product (configurators, tours, demos).
What you get hands-off
After delivery: source repository on GitHub (private), commented code, a 5-min Loom walkthrough explaining the scene logic, and the asset pipeline documented. First year of hosting and minor revisions is included. After that we agree on a maintenance plan if needed.
Frequently asked questions
Why pick this technology over alternatives?
What if a newer tool comes out next year?
How long does this take?
What does it cost?
What if my visitors are on weak phones?
Ready to ship a 3D experience?
Tell me what you need — fixed price, fixed deadline, no surprises.