Create 2D Billboards in Three.js with SpriteMaterial

In Three.js, creating 2D elements that constantly face the camera—commonly known as billboards—is highly efficient using the Sprite and SpriteMaterial classes. This article provides a quick, step-by-step guide on how to set up a SpriteMaterial, apply a texture to it, and render a 2D sprite that automatically rotates to face the viewer in a 3D scene.

What is a Sprite?

A Sprite is a special type of 3D object in Three.js that always faces the camera. Unlike a standard Mesh created with a PlaneGeometry, a Sprite does not require you to manually update its rotation matrix in the animation loop; Three.js handles the camera-facing calculation automatically under the hood.

To create a billboard, you must pair a Sprite object with a SpriteMaterial.

Step-by-Step Implementation

Follow these steps to implement a 2D billboard in your Three.js project:

1. Load the Texture

First, load the image file you want to display on your billboard using the TextureLoader.

import * as THREE from 'three';

// Create a texture loader
const textureLoader = new THREE.TextureLoader();

// Load your image texture
const spriteMap = textureLoader.load('path/to/your/image.png');

2. Create the SpriteMaterial

Next, instantiate a SpriteMaterial. This material is specifically designed to work with Sprite objects. You can pass your loaded texture into the map property.

const spriteMaterial = new THREE.SpriteMaterial({
    map: spriteMap,
    color: 0xffffff, // Use white to preserve original texture colors
    transparent: true // Enable transparency if your image has an alpha channel
});

3. Instantiate the Sprite

Create the Sprite object by passing the material into its constructor. Then, position it in your 3D space.

const sprite = new THREE.Sprite(spriteMaterial);

// Position the sprite in the scene
sprite.position.set(0, 5, -10);

// Scale the sprite (Sprites are 1x1 units by default)
sprite.scale.set(2, 2, 1); 

// Add the sprite to your scene
scene.add(sprite);

Key Considerations for Sprites