Interactive 3D Website Development

The label covers a wide range, and the range matters because the costs differ by an order of magnitude.

• A 3D element on a normal page. A rotating product, a hero object, a WebGL background. The site is a site; 3D is one component. Cheapest, safest, and usually the right call.
• A scroll-driven narrative. The page scroll drives a camera or an animation: a product assembling, a journey through a scene. This is the format most people picture. The difficulty is not the 3D, it is choreographing it against real content while keeping the page usable.
• An explorable scene. The visitor moves through a space rather than down a page. Effectively a small game in a browser. Expensive, and rarely the right answer for a marketing site.
• A generative or shader-driven site. The visuals are computed rather than modelled (fluid, particles, distortion, type effects). Can be extremely light, since there may be no model to download at all, and the hero animation on this page is one.

Choosing the wrong tier is the most expensive mistake available here. An explorable scene where a single rotating product would have converted better costs both the build and the conversions.

3D on the web has a deserved reputation for slow sites. It is deserved because most 3D sites are built as demos and shipped as marketing pages. Here is what actually has to hold.

Core Web Vitals

Google measures three things that a 3D site can easily break.

LCP: how long until the largest visible element appears. If the canvas is the largest element and it waits on a model download, LCP is the model download. The fix is structural: the page's headline and copy are real HTML, rendered server-side, and they are what paints first. The 3D arrives afterwards.

INP: how quickly the page responds to interaction. A heavy scene starves the main thread and every tap feels late. Keeping the render loop honest, moving work to workers or the GPU, and not decoding a 40 MB texture during a scroll are what protect it.

CLS: how much the layout jumps. Canvases that resize after load, or a scene that pushes content down when it initialises, cause exactly this. Reserve the space before anything loads.

None of these forbid 3D. They forbid 3D that blocks the page, which is a build decision rather than a property of the medium.

Mobile GPUs

The gap between a development laptop and a mid-range Android is enormous, and it is not mainly about speed; it is memory and heat. Mobile GPU memory is limited and shared; exceed it and the browser reloads the tab silently. Sustained load causes thermal throttling, so a scene that runs at 60 fps for twenty seconds runs at 25 fps after two minutes.

The practical rules: compress textures to KTX2 so they stay compressed in GPU memory, cap resolution rather than rendering at full retina density, cap the pixel ratio, draw fewer objects rather than simpler ones, and stop the render loop entirely when the canvas scrolls out of view. That last one is a two-line change that fixes most complaints about 3D sites draining batteries.

The download

Nobody waits eight seconds. Compressed geometry, compressed textures, code-split the 3D bundle so it is never part of the initial JavaScript payload, and prefer generated visuals over downloaded models where the design allows it. A shader costs kilobytes.

Three things are non-negotiable, and all three are cheap when planned and expensive when retrofitted.

Respect prefers-reduced-motion. Some people get genuinely ill from parallax, continuous motion and scroll-hijacked camera moves. The OS setting exists to tell you that, and a site that ignores it is not edgy, it is careless. Respecting it does not mean a blank page: it means no auto-rotation, no continuous drift, no motion the visitor did not initiate. The static scene is often the better composition anyway.

Never make 3D the only route to content. If the price, the specification or the navigation exists only inside the canvas, then screen reader users, keyboard users and anyone whose GPU is blocklisted have no route to it. The canvas is a picture. The content is HTML, underneath it, always.

Keyboard operation. Controls are buttons and receive focus, with a visible focus ring. Scroll-driven scenes must remain navigable by keyboard scroll, which rules out the more aggressive forms of scroll hijacking.

Scroll hijacking deserves its own note. Taking over the scroll wheel to drive a camera can be beautiful and it breaks find-in-page, position memory, deep links and the scrollbar as an indicator of length. When it is used, it should be for a bounded section rather than the whole document, and the page should still be readable by scrolling normally past it.

WebGL fails more often than the demos suggest: old drivers, locked-down corporate machines, GPU blocklists, battery-saver modes, virtualised environments, some headless crawlers. It is a small percentage, and a small percentage of a marketing site's traffic is still a meaningful number of people.

The design question to settle early is what those visitors see. The answer should be a designed state (a still image or a poster frame, the same headline, the same call to action) and not a black rectangle or a browser-console error.

This is also why the page is built server-rendered first. Every heading, every paragraph, every link exists in the HTML before any JavaScript runs. The 3D layers on top. Test it by disabling JavaScript in your own browser: if the page still reads and still converts, it is built correctly. That test is worth running on any 3D site you are considering commissioning, including mine.

The showcase on this site is a few thousand Three.js sites, and it is a useful place to calibrate before commissioning anything: browse it on your phone, on mobile data, and notice which ones you wait for.

Cost is driven by the tier above, plus four things:

1. Bespoke 3D content. Modelling, texturing and animation are a separate discipline from development, and on an explorable scene they dominate the budget. Generative and shader-driven work skips this entirely, which is why it is often the best value.
2. Choreography. Scroll-driven sequences are iterative by nature. Timing gets tuned by feel, in review, repeatedly. Budget for iteration rather than treating it as scope creep.
3. Device coverage. Supporting current flagship phones is one number. Supporting a four-year-old mid-range Android is a larger one, and it is usually the correct one.
4. What happens after launch. A 3D site is software. Browsers update, GPUs get blocklisted, a library moves a version. A site with no maintenance plan degrades quietly.

For most businesses, the highest-return version is the first tier — one strong 3D element on a fast conventional site. It costs a fraction of a full 3D experience, it carries almost none of the performance risk, and on a landing page it is usually indistinguishable in effect. I have talked several people down from tier three to tier one and I do not remember anyone regretting it.

Three.js is the practical default: mature, enormous ecosystem, works everywhere. In a React codebase, React Three Fiber expresses the same thing as components, which matters when the 3D has to coexist with an application rather than sit in a standalone page.

WebGPU is the newer graphics API. Through Three.js's node system and TSL it makes compute work practical in the browser and material authoring composable. For a rotating logo it changes nothing. For particle systems, heavy post-processing or many dynamic lights, it changes what is affordable. The right posture today is WebGPU where it is supported, WebGL everywhere else, one codebase. That is what Three.js's node materials are for.

GSAP handles the animation choreography, and smooth-scroll libraries handle the scroll feel, both of which this site uses. They are worth naming because they carry the same caveats: they must respect reduced motion, and they must not take the page's scrollbar hostage.

3D chosen before the message. If the brief starts with "we want something like [award site]" rather than with what the page has to persuade someone to do, the 3D becomes decoration with a hosting bill. Decide what the page is for, then decide whether 3D serves it.

Desktop-first, mobile as an afterthought. Most traffic is mobile. A scene designed for a 27-inch display and then "made responsive" is two builds, done badly, in sequence.

Loading screens as a design feature. A progress bar is an apology. Sometimes an honest one, but a five-second wait costs more visitors than the animation earns.

Everything at once. Bloom, depth of field, chromatic aberration, particles, a physics simulation. Each is a frame-rate cost, and combined they turn into a heater. Restraint reads as quality.

No measurement after launch. Real-user performance data will tell you what devices your visitors actually have, and it is almost always slower than the assumption. Ship with monitoring or you are guessing.

A page that is only a page with JavaScript. Which is also an SEO problem, an accessibility problem and a fragility problem, all at once. Server-render the content. Enhance with 3D. In that order.