Creating Stunning Scene Transitions with Three.js

Question

Creating Stunning Scene Transitions with Three.js

I'm having trouble finding a standard method to animate the transition between different scenes in my Three.js project. My current implementation looks like this:

var sceneIndex;
var currentScene;

switch (sceneIndex) {
   case 1:
          currentScene = scene;
          break;
   case 2:
          currentScene = scene1;
          break;
}

When I want to switch scenes:

if (clickEvent) {
   sceneIndex = 2
}

The scene is rendered using this code:

renderer.render(currentScene, camera); //One camera is used

Currently, there is an abrupt change from one scene to another which isn't very user-friendly. I would like to implement a simple fade-to-black animation when the currentScene variable changes. Can you recommend a way to achieve this effect? Thank you.

javascript three.js

Answer 1

Answer №1

You don't have to rely on Three.js for this task. Instead, you can simply place a div over the canvas and use CSS animations to create a fading effect from black screen to normal. By timing the animation duration, you can seamlessly switch scenes at the midpoint with the help of setTimeout().

Here's how you can achieve this:

Position a div over your canvas using absolute positioning
Create a CSS class containing the necessary animation properties (refer to the example below)
Define keyframes for the animation sequence (as shown in the example)
Execute the animation by:
1. Removing the class from the element
2. Performing an action on the element (e.g., div.offsetWidth)
3. Adding the class back to the element

The animation will play when the element has the designated class applied to it. It will continue until completion or until the class is removed.

Below is a code snippet demonstrating this process:

var color = "#0000FF";

function changeScene() {
    // Trigger animation
    var div = document.getElementById("curtain");
    div.classList.remove("screen-change");
    div.offsetWidth;
    div.classList.add("screen-change");
   
    // Perform scene transition
    setTimeout(function() {
        color = color == "#0000FF"? "#FF0000" : "#0000FF";
        document.getElementById("render").style.background = color;
    }, 1000);
};

div {
    width: 160px;
    height: 90px;
}

#render {
    background: #0000FF;
}
#curtain {
    background: black;
    opacity: 0;
}

.screen-change {
    animation-name: screen-change;
    animation-duration: 2s;
}

@keyframes screen-change {
    0% {opacity: 0;}
    30% {opacity: 1;}
    /* Waiting time */
    70% {opacity: 1;}
    100% {opacity: 0;}
}

<div id="render"><div id="curtain"></div></div>

<button id="scene-changer" onclick="changeScene()">Change scene</button>

This method is cost-effective as it utilizes CSS animations, which are widely supported by major browsers, resulting in a visually appealing transition effect.

Answer 2

You don't have to rely on Three.js for this task. Instead, you can simply place a div over the canvas and use CSS animations to create a fading effect from black screen to normal. By timing the animation duration, you can seamlessly switch scenes at the midpoint with the help of setTimeout().

Here's how you can achieve this:

Position a div over your canvas using absolute positioning
Create a CSS class containing the necessary animation properties (refer to the example below)
Define keyframes for the animation sequence (as shown in the example)
Execute the animation by:
1. Removing the class from the element
2. Performing an action on the element (e.g., div.offsetWidth)
3. Adding the class back to the element

The animation will play when the element has the designated class applied to it. It will continue until completion or until the class is removed.

Below is a code snippet demonstrating this process:

var color = "#0000FF";

function changeScene() {
    // Trigger animation
    var div = document.getElementById("curtain");
    div.classList.remove("screen-change");
    div.offsetWidth;
    div.classList.add("screen-change");
   
    // Perform scene transition
    setTimeout(function() {
        color = color == "#0000FF"? "#FF0000" : "#0000FF";
        document.getElementById("render").style.background = color;
    }, 1000);
};

div {
    width: 160px;
    height: 90px;
}

#render {
    background: #0000FF;
}
#curtain {
    background: black;
    opacity: 0;
}

.screen-change {
    animation-name: screen-change;
    animation-duration: 2s;
}

@keyframes screen-change {
    0% {opacity: 0;}
    30% {opacity: 1;}
    /* Waiting time */
    70% {opacity: 1;}
    100% {opacity: 0;}
}

<div id="render"><div id="curtain"></div></div>

<button id="scene-changer" onclick="changeScene()">Change scene</button>

This method is cost-effective as it utilizes CSS animations, which are widely supported by major browsers, resulting in a visually appealing transition effect.

Creating Stunning Scene Transitions with Three.js

Answer №1

Here's how you can achieve this:

Similar questions

Why is JavaScript unable to fetch JSON data from C when the uint32 value is a multiple of 256 plus 10?

Assigning a property to the Next.js response object

Finding the Modular Reciprocal with JavaScript

In the production mode, Webpack doesn't compile any code

Utilize Ag Grid to selectively apply borders between grouped values

Injecting services into AngularJS controllers helps to provide the necessary dependencies

Fadeout text slider in Javascript

AngularJS: The art of object pushing

Do You Really Need a Try/Catch Block for a Node.js MySQL Query?

Tips on transmitting and receiving substantial JSON information

What is the process for assigning an id to a div in order to make comparisons in React?

Retrieving a designated set of attributes for elements chosen using an element selector

Choose the Nth option in the dropdown list using programming

An elaborate warning mechanism in Redux-observable that does not trigger an action at the conclusion of an epic

The navigation links will remain visible even when the unordered list is set to 0% opacity

Concealing .js files while working with .ts extensions

Utilizing jQuery for AJAX requests on a timed loop

retrieve the item that contains a vacant array within a specific record

The latest update to the Server Stats code mistakenly changes the channel to "undefined" instead of displaying the total number

Is it possible to design a collapsible element that gives a sneak peek of its content before fully expanding?