How Can I Make My Three.js Background Transparent or a Custom Color?

Transparent or Colorful Three.js Background: A Solution

By default, the background of Three.js canvas is rendered in black. However, you may desire a transparent or custom color background to enhance your visualizations. If your attempts to change the background have been unsuccessful, this article explores the solution.

The Problem

As described by the user, setting the background color using CSS opacity and background properties has no effect on the canvas. This is because the black background is rendered by Three.js itself.

The Solution

The solution lies in manipulating the following setting within your Three.js code:

renderer.setClearColorHex(0x000000, 1);

To achieve a transparent background, change the above line to:

renderer.setClearColor(0xffffff, 0);

However, this change only ensures transparency; your scene will not be visible. To render your scene with a transparent background, you need to use a WebGLRenderer with the alpha property set to true:

var renderer = new THREE.WebGLRenderer({alpha: true});

For a custom color background, you can use the following code:

renderer.setClearColorHex(0xff0000, 1);

Alternatively, you can set the background color as a THREE.Color object:

var scene = new THREE.Scene(); // Initializing the scene
scene.background = new THREE.Color(0xff0000);

By implementing these changes, you can now control the background of your Three.js visualizations, whether it be transparent or any desired color.

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