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Integration guide

Three.js with SvelteKit

Minimal boilerplate, maximum 3D performance with SvelteKit

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npm install three[01]

Overview

Three.js in SvelteKit

SvelteKit's compile-time approach produces lean, fast bundles — a great match for Three.js experiences where performance is critical. Svelte's reactive stores and lifecycle hooks integrate cleanly with the Three.js render loop.

[Scroll to continue]

Quick start

npm install three
<!-- src/routes/+page.svelte -->
<script>
  import { onMount, onDestroy } from 'svelte'
  import * as THREE from 'three'

  let canvas
  let renderer, animId

  onMount(() => {
    const scene = new THREE.Scene()
    const camera = new THREE.PerspectiveCamera(75, canvas.clientWidth / canvas.clientHeight, 0.1, 1000)
    renderer = new THREE.WebGLRenderer({ canvas })
    renderer.setSize(canvas.clientWidth, canvas.clientHeight)

    const mesh = new THREE.Mesh(
      new THREE.IcosahedronGeometry(1, 1),
      new THREE.MeshNormalMaterial({ wireframe: true })
    )
    scene.add(mesh)
    camera.position.z = 3

    const animate = () => {
      animId = requestAnimationFrame(animate)
      mesh.rotation.x += 0.005
      mesh.rotation.y += 0.01
      renderer.render(scene, camera)
    }
    animate()
  })

  onDestroy(() => {
    cancelAnimationFrame(animId)
    renderer?.dispose()
  })
</script>

<canvas bind:this={canvas} class="w-full h-screen block" />
Where it helps[01]
  • +Tiny bundle size — no virtual DOM overhead
  • +Svelte stores integrate elegantly with 3D scene state
  • +onMount / onDestroy map directly to Three.js setup/teardown
  • +Threlte library provides declarative R3F-like DX for Svelte
  • +Excellent Vite integration for fast builds
Where it costs you[02]
  • −Smaller community than React/Next.js for Three.js resources
  • −Threlte is less mature than React Three Fiber
  • −Manual TypeScript types may need importing for Three.js

Best fit

What this pairing is good at

Every stack has a shape it suits. These are the projects where SvelteKit and Three.js pull in the same direction.

[04 cases]
[01]

Interactive portfolio sites

[02]

Creative WebGL experiments

[03]

Lightweight product showcases

[04]

Games and interactive experiences

F.A.Q

Frequently asked questions

What people ask about running Three.js inside SvelteKit.

Setup

Getting the scene on the page.

Threlte (threlte.xyz) is a component library for Svelte that wraps Three.js declaratively, similar to React Three Fiber. It's the recommended approach for complex Three.js scenes in SvelteKit.

In production

Performance, builds and gotchas.

Use a Svelte action or add an event listener inside onMount, and clean it up in onDestroy to prevent memory leaks.

Official documentation
SvelteKit docs ↗Three.js docs ↗
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#svelte#website#webgl
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