Learn the technique for creating smooth background fade effects in three.js

As I dive into learning three.js, I am faced with a challenge. I have implemented three buttons for different backgrounds in my project, but I want them to fade in and out when clicked.

The code snippet I am currently using for the buttons is given below:

var material = new THREE.MeshBasicMaterial( {
    map: THREE.ImageUtils.loadTexture( 'pic.jpg' )
} );

var backgroundButton1 = document.getElementById('change-background-1');
backgroundButton1.addEventListener('click', function(){
   material.map = THREE.ImageUtils.loadTexture('pic.jpg');
});

var backgroundButton2 = document.getElementById('change-background-2');
backgroundButton2.addEventListener('click', function(){
   material.map = THREE.ImageUtils.loadTexture('pic1.jpg');
});

var backgroundButton3 = document.getElementById('change-background-3');
backgroundButton3.addEventListener('click', function(){
   material.map = THREE.ImageUtils.loadTexture('pic2.jpg');
});

var mesh = new THREE.Mesh( geometry, material );
scene.add( mesh );

I am seeking guidance on how to achieve the desired fading effect. How can I accomplish this task?

Answer №1

To make the material more transparent, you can adjust the opacity value.

Here's a helpful resource:

mesh.material.opacity = 1;

Another option is to utilize a tweening engine like TweenMax.

For instance:


mesh.material.opacity = 0;
TweenMax.to(mesh.material, 1, { opacity: 1 });

Answer №2

As you progress, make sure to update your resources on two key aspects:

  • enable transparency by setting mesh.material.transparent = true
  • gradually adjust opacity from 0 to 1 using linear interpolation:
    mesh.material.opacity = adjustedOpacity

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