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Learning Three.js: The JavaScript 3D Library for WebGL - Second Edition

Chapter 2. Basic Components That Make Up a Three.js Scene

In the previous chapter, you learned the basics of Three.js. We showed a couple of examples, and you created your first complete Three.js scene. In this chapter, we'll dive a bit deeper into Three.js and explain the basic components that make up a Three.js scene. In this chapter, you'll explore the following topics:

The components that are used in a Three.js scene
What you can do with the THREE.Scene object
How geometries and meshes are related
The difference between the orthographic and perspective cameras

We start with looking at how you can create a scene and add objects.

Creating a scene

In the previous chapter, you created THREE.Scene, so you already know the basics of Three.js. We saw that for a scene to show anything, we need three types of components:

Component	Description
Camera	This determines what is rendered on the screen.
Lights	These have an effect on how materials are shown and used when creating shadow effects (discussed in detail in Chapter 3, Working with the Different Light Sources Available in Three.js).
Objects	These are the main objects that are rendered from the perspective of the camera: cubes, spheres, and the like.

THREE.Scene serves as the container for all these different objects. This object itself doesn't have that many options and functions.

Note

THREE.Scene is a structure that is sometimes also called a scene graph. A scene graph is a structure that can hold all necessary information of a graphical scene. In Three.js, this means that THREE.Scene contains all the objects, lights, and other objects necessary for rendering...

What you will learn

Use the different geometries that are provided by Three.js

Apply realistic lighting and shadows to the 3D objects you have created

Use the different camera controls provided by Three.js to effortlessly navigate around your 3D scene

Make use of advanced textures on materials to create realisticlooking 3D objects by using bump maps, normal maps, specular maps, and light maps

Import and animate models from external formats, such as OBJ, STL, Collada, and many more

Create and run animations using morph targets and bone animations

Explore the Physijs JavaScript library to apply physics to your 3D objects

Interact directly with WebGL by creating custom vertex and fragment shaders

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Amazon verified reviews

christian sasso May 22, 2016

It is amazing how much one can do by simply reading the first 2 or 3 chapters: part of it is because THREE.js is a great little library, and in part the author deserves credit for his clear and concise explanations. This is a fast moving world and some of the examples raise warning in the console of modern browsers: what one has to go is perform the usual googling that is part of the daily rituals of every software engineer, so I am not lowering my stars because of that: I think that this book is as good as a book can be nowadays that technology moves at its pretty reckless pace.I am not affiliated with the author and did buy this book with my own hard earned money.

Amazon Verified review

August Bollinger Jun 28, 2015

This book covers everything you will need to get started using Three.js and more. It's written well, with easy to understand phrasing, and in a way that is educational. My favorite chapter was Chapter 3: Working with the Different Light Sources Available in Three.js.

Tina Z Jun 10, 2015

Love this book! It is very easy to follow and the examples can be applied directly which allowed me to create stunning 3D graphics using JavaScript in an effortless way. And it also shows cool things like how to use the HTML5 video and canvas elements as a material for 3D objects and how to add physics such as gravity and collision detection to the scene etc. Highly recommend it!

Marcus Jul 14, 2015

It's an excellent book for getting started. The author has a lot of examples that you can work on without any installation whatsoever. My only advice is to brush up on Linear Alegbra if you want to have a full understanding of the content. If you are looking to get down to business and start programming right away this is a good book to get you going.

Keith Hoffman Mar 03, 2016

Great Resource! Helps tremendously...

Learning Three.js: The JavaScript 3D Library for WebGL - Second Edition: Create stunning 3D graphics in your browser using the Three.js JavaScript library

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Learning Three.js: The JavaScript 3D Library for WebGL - Second Edition

Chapter 2. Basic Components That Make Up a Three.js Scene

Creating a scene

Note

Geometries and meshes

The properties and functions of a geometry

Different cameras for different uses

Orthographic camera versus perspective camera

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