How to Build a 3D Animated Website With AI, Section by Section

Build the page without effects first, check that it works, then add one depth or motion effect per section and test again. AI coding tools can write the effect code for you, but a page that hides its headline behind an animation, or loads a large video before any text, is slower and harder to use.

This page covers the motion layer. To write the underlying brief, start with the free website template and brief builder; to place that brief in your tool, see one brief, three tool workflows.

What makes a website feel 3D?

Most “3D” websites combine a few techniques. Pick by what the effect needs to communicate, not by how impressive it is.

The section-by-section method

1. Build the page with no effects

Generate the page from your brief and check it first: headline, offer, action, phone layout and keyboard access. Effects added to a broken page make problems harder to find.

2. Set the motion rules once

Add these to your project instructions (AGENTS.md, CLAUDE.md or Cursor rules) or the start of your builder conversation:

Motion rules for this project:
- Use one easing curve for all entrances: cubic-bezier(0.16, 1, 0.3, 1), 500-700 ms.
- Text and buttons in the first screen are visible immediately; never fade them in from opacity 0.
- Every animation has a prefers-reduced-motion version with no movement.
- Videos are muted, have a poster image and start only after the page has loaded.
- Do not add a 3D library unless I ask for a rotating 3D object.

3. Add one effect, then review it

Ask for a single, bounded change, for example:

Add a subtle depth effect to the three cards in the offer section: on pointer hover, tilt each card up to 6 degrees toward the pointer using CSS perspective. No effect on touch devices or with reduced motion. Change nothing else, and tell me which files you changed.

Then check it on a phone-sized screen, with a keyboard and with reduced motion turned on in your operating system.

4. Repeat for the next section

Reuse the same easing and timing so the page feels designed as one piece. If two effects compete for attention in one view, remove one.

5. Add heavy media last

Background video and WebGL scenes cost the most to load. Add them after everything else works, and use only footage, models and textures you made or have a licence for.

How do you check speed and accessibility?

• Run Lighthouse in Chrome's DevTools with mobile settings before and after each heavy effect, and compare the Largest Contentful Paint time.
• Make sure the largest text on the first screen appears without waiting for a script or a font.
• Turn on reduced motion and check that every section is still readable and nothing moves on its own.
• Give visitors a way to pause motion that starts by itself, lasts more than five seconds and plays alongside other content, as the W3C's Pause, Stop, Hide guidance describes.

From our own measurements on promptpack.tech on 28 October 2026: on simulated mobile, headline text took several seconds to appear while scripts, a large icon file and video downloads competed with it. We fixed that by starting videos after load and removing the oversized files. Your page will differ; measure it.

Written by PromptPack, the seller of the website prompt pack. You can follow this method without buying anything.