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#### Overview of this book

WebGL makes it possible to create 3D graphics in the browser without having to use plugins such as Flash and Java. Programming WebGL, however, is difficult and complex. With Three.js, it is possible to create stunning 3D graphics in an intuitive manner using JavaScript, without having to learn WebGL. With this book, you’ll learn how to create and animate beautiful looking 3D scenes directly in your browser-utilizing the full potential of WebGL and modern browsers. It starts with the basic concepts and building blocks used in Three.js. From there on, it will expand on these subjects using extensive examples and code samples. You will learn to create, or load, from externally created models, realistic looking 3D objects using materials and textures. You’ll find out how to easily control the camera using the Three.js built-in in camera controls, which will enable you to fly or walk around the 3D scene you created. You will then use the HTML5 video and canvas elements as a material for your 3D objects and to animate your models. Finally, you will learn to use morph and skeleton-based animation, and even how to add physics, such as gravity and collision detection, to your scene. After reading this book, you’ll know everything that is required to create 3D animated graphics using Three.js.
Preface
Free Chapter
Creating Your First 3D Scene with Three.js
The Basic Components that Make Up a Three.js Application
Working with Light Sources in Three.js
Working with Three.js Materials
Learning to Work with Geometries
Points and Sprites
Animations and Moving the Camera
Render Postprocessing
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# Geometries and meshes

In each of the examples so far, you've seen geometries and meshes being used. For instance, to add a sphere to the scene, we did the following:

```var sphereGeometry = new THREE.SphereGeometry(4,20,20);
var sphereMaterial = new THREE.MeshBasicMaterial({color: 0x7777ff);
var sphere = new THREE.Mesh(sphereGeometry,sphereMaterial); ```

We define the geometry (THREE.SphereGeometry), the shape of an object, and its material (THREE.MeshBasicMaterial), and we combined these two in a mesh (THREE.Mesh) that can be added to a scene. In this section, we'll take a closer look at geometries and meshes. We'll start with the geometry.

# The properties and functions of a geometry

Three.js comes with a large...