Book Image

Learn Three.js - Fourth Edition

By : Jos Dirksen
Book Image

Learn Three.js - Fourth Edition

By: Jos Dirksen

Overview of this book

Three.js has become the industry standard for creating stunning 3D WebGL content. In this edition, you’ll learn about all the features of Three.js and understand how to integrate it with the newest physics engines. You'll also develop a strong grip on creating and animating immersive 3D scenes directly in your browser, reaping the full potential of WebGL and modern browsers. The book starts with the basic concepts and building blocks used in Three.js and helps you explore these essential topics in detail through extensive examples and code samples. You'll learn how to create realistic-looking 3D objects using textures and materials and how to load existing models from an external source. Next, you'll understand how to control the camera using the Three.js built-in camera controls, which will enable you to fly or walk around the 3D scene you've created. Later chapters will cover the use of HTML5 video and canvas elements as materials for your 3D objects to animate your models. You’ll learn how to use morph targets and skeleton-based animation, before understanding how to add physics, such as gravity and collision detection, to your scene. Finally, you’ll master combining Blender with Three.js and creating VR and AR scenes. By the end of this book, you'll be well-equipped to create 3D-animated graphics using Three.js.
Table of Contents (21 chapters)
Part 1: Getting Up and Running
Part 2: Working with the Three.js Core Components
Chapter 5: Learning to Work with Geometries
Part 3: Particle Clouds, Loading and Animating Models
Part 4: Post-Processing, Physics, and Sounds

Creating a geometry by extruding a 2D shape

Three.js provides a way in which we can extrude a 2D shape into a 3D shape. By extruding, we mean stretching out a 2D shape along its z axis to convert it to 3D. For instance, if we extrude THREE.CircleGeometry, we get a shape that looks like a cylinder, and if we extrude THREE.PlaneGeometry, we get a cube-like shape. The most versatile way of extruding a shape is using THREE.ExtrudeGeometry.


With THREE.ExtrudeGeometry, you can create a 3D object from a 2D shape. Before we dive into the details of this geometry, let’s first look at an example, extrude-geometry.html. The following screenshot taken from the example shows this geometry:

Figure 6.6 – Creating a 3D geometry from a 2D shape

Figure 6.6 – Creating a 3D geometry from a 2D shape

In this example, we took the 2D shape we created in the 2D geometries section in Chapter 5, and used THREE.ExtrudeGeometry to convert it to 3D. As you can see in the preceding screenshot...