tresjs

---
name: tresjs
description: Use when building 3D scenes with TresJS (Vue Three.js) - provides TresCanvas, composables (useTres, useLoop), Cientos helpers (OrbitControls, useGLTF, Environment), and post-processing effects
license: MIT
---

# TresJS

Vue 3 framework for building 3D scenes with Three.js. Declarative components that wrap Three.js objects.

**Packages:** `@tresjs/core` (required), `@tresjs/cientos` (helpers), `@tresjs/post-processing` (effects)

## Installation

```bash
# Core (required)
pnpm add three @tresjs/core

# Helpers - controls, loaders, materials, staging
pnpm add @tresjs/cientos

# Post-processing effects
pnpm add @tresjs/post-processing
```

## Quick Reference

| Working on...                | Load file              |
| ---------------------------- | ---------------------- |
| TresCanvas, useTres, useLoop | references/core.md     |
| Controls, loaders, materials | references/cientos.md  |
| Bloom, glitch, DOF effects   | references/effects.md  |
| Common patterns, recipes     | references/cookbook.md |

## Loading Files

**Load based on your task:**

- [ ] [references/core.md](references/core.md) - TresCanvas setup, composables, events, primitives
- [ ] [references/cientos.md](references/cientos.md) - OrbitControls, useGLTF, Environment, materials
- [ ] [references/effects.md](references/effects.md) - EffectComposer, bloom, glitch, DOF
- [ ] [references/cookbook.md](references/cookbook.md) - Load models, camera setup, animations

**DO NOT load all files at once.** Load only what's relevant.

## Core Concepts

### TresCanvas

Root component that creates WebGL renderer and scene:

```vue
<script setup lang="ts">
import { TresCanvas } from '@tresjs/core'
</script>

<template>
  <TresCanvas shadows alpha>
    <TresPerspectiveCamera :position="[5, 5, 5]" />
    <TresMesh>
      <TresBoxGeometry />
      <TresMeshStandardMaterial color="orange" />
    </TresMesh>
    <TresAmbientLight :intensity="0.5" />
    <TresDirectionalLight :position="[3, 3, 3]" :intensity="1" />
  </TresCanvas>
</template>
```

### Component Naming

All Three.js classes available as Vue components with `Tres` prefix:

- `THREE.PerspectiveCamera` → `<TresPerspectiveCamera />`
- `THREE.Mesh` → `<TresMesh />`
- `THREE.BoxGeometry` → `<TresBoxGeometry />`
- `THREE.MeshStandardMaterial` → `<TresMeshStandardMaterial />`

Constructor arguments via `:args` prop:

```vue
<TresPerspectiveCamera :args="[75, 1, 0.1, 1000]" />
```

### Reactivity

Props are reactive - changes update the 3D scene:

```vue
<script setup>
const color = ref('orange')
const position = ref([0, 0, 0])
</script>

<template>
  <TresMesh :position="position">
    <TresMeshStandardMaterial :color="color" />
  </TresMesh>
</template>
```

### Primitive Component

Inject existing Three.js objects directly:

```vue
<script setup>
import { useGLTF } from '@tresjs/cientos'
const { scene } = await useGLTF('/model.glb')
</script>

<template>
  <primitive :object="scene" />
</template>
```

## Available Guidance

**[references/core.md](references/core.md)** - TresCanvas props, useTres, useLoop, useGraph, events, performance

**[references/cientos.md](references/cientos.md)** - OrbitControls, useGLTF, useTexture, Environment, Sky, materials, shapes

**[references/effects.md](references/effects.md)** - EffectComposer vs EffectComposerPmndrs, bloom, glitch, DOF, effect stacking

**[references/cookbook.md](references/cookbook.md)** - Load 3D model, camera with controls, animation loop, post-processing