How can one make a switch to a different value in threejs smoothly?

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One way to smoothly transition to a different value in Three.js is to use the Tween.js library. Tween.js allows you to create animations that smoothly interpolate between two values over a specified amount of time. Here is an example of how to create a Tween animation in Three.js:

1. First, include Tween.js in your code by adding the following line in your HTML file:

<script src="https://cdnjs.cloudflare.com/ajax/libs/tween.js/16.7.0/Tween.min.js"></script>

1. Initialize your starting and ending values.

var startingValue = 0;
var endingValue = 1;
var duration = 1000; // in milliseconds

1. Create a new Tween object and define its properties.

var tween = new TWEEN.Tween({ value: startingValue })
    .to({ value: endingValue }, duration)
    .easing(TWEEN.Easing.Quadratic.InOut)
    .onUpdate(function () {
        // update the object with the new value
        object.value = this.value;
    })
    .start();

1. Update the Tween object in your render loop to ensure that the animation is running smoothly.

function animate() {
    requestAnimationFrame(animate);
    TWEEN.update();
    renderer.render(scene, camera);
}

This will smoothly animate the transition of the object.value property from startingValue to endingValue over a duration of 1 second. You can customize the easing function and duration to achieve different effects.