探索开源Three.js：WebGL的JavaScript 3D编程指南

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"《Learning Three.js》是一本由Jos Dirksen编写的关于JavaScript 3D库的指南，专注于WebGL技术。这本书是Packt Publishing出版的作品，版权属于2013年。它旨在帮助读者创建和动画化令人惊叹的3D图形，通过利用开源的Three.js JavaScript库，该库在Web开发中扮演了关键角色。书中内容涵盖了Three.js的基础知识，包括如何设置3D场景、构建几何体、纹理映射、光照和阴影效果，以及如何控制相机和动画。此外，读者还将学习如何将3D模型导入到项目中，实现交互式用户体验，如鼠标事件驱动的交互、动画路径和物理模拟等。书中还特别强调了性能优化和跨平台兼容性的重要性，确保在现代浏览器环境下获得最佳显示效果。值得注意的是，尽管本书力求提供准确的信息，但作者和出版社对其内容的准确性并不承担法律上的责任，且所有复制、存储或传输本书内容的行为都需要事先获得书面许可，除非是在进行学术引用或评论。同时，由于涉及众多商标，出版社尽力确保正确标注，但不能保证其准确性。《Learning Three.js》是一本实用的教程，适合想要深入理解WebGL和Three.js技术的前端开发者，无论是初学者还是希望提升技能的专业人士，都能从中受益匪浅。通过阅读这本书，读者将能够掌握利用JavaScript进行3D图形编程的必要技能，并将其应用到实际项目中，推动网页和应用程序的视觉效果提升到新的高度。"

Preface

In the last couple of years, browsers have gotten more powerful and are capable

platforms to deliver complex applications and graphics. Most of this, though, is

standard 2D graphics. Most modern browsers have adopted WebGL, which allows

you to not only create 2D applications and graphics in the browser, but also create

beautiful and good performing 3D applications, using the capabilities of the GPU.

Programming WebGL directly, however, is very complex. You need to know the

inner details of WebGL and learn a complex shader language to get the most out of

WebGL. The Three.js library provides a very easy-to-use JavaScript API based on the

features of WebGL, so that you can create beautiful 3D graphics, without having to

learn the WebGL details.

The Three.js library provides a large number of features and APIs that you can use

to create 3D scenes directly in your browser. In this book you'll learn all the different

APIs that the Three.js library has to offer through lots of interactive examples and

code samples.

What this book covers

Chapter 1, Creating Your First 3D Scene with Three.js, covers the basic steps that you

need to take to get started with the Three.js library. You'll immediately create your

rst Three.js scene and at the end of this chapter, you'll be able to create and animate

your rst 3D scene directly in the browser.

Chapter 2, Working with the Basic Components That Make Up a Three.js Scene, explains

the basic components that you need to understand while working with the Three.js

library. You'll learn about lights, meshes, geometries, materials, and cameras. In this

chapter you will also get an overview of the different lights that the Three.js library

provides and the cameras you can use in your scene.

Preface

[ 2 ]

Chapter 3, Working with the Different Light Sources Available in Three.js, dives deeper

into the different lights that you can use in your scene. It shows examples and

explains how to use a SpotLight, DirectionLight, AmbientLight, PointLight,

HemisphereLight, and AreaLight sources. Additionally, it also shows how to

apply a LensFlare effect on your light source.

Chapter 4, Working with the Three.js Materials, talks about the materials available in

the Three.js library that you can use in your meshes. It shows all the properties that

you can set to congure the materials for your specic use and provides interactive

examples to experiment with the materials that are available in the Three.js library.

Chapter 5, Learning to Work with Geometries, is the rst of two chapters that explores all

the geometries that are provided by the Three.js library. In this chapter you'll learn

how to create and congure geometries in Three.js and you can experiment by using

the provided interactive examples, with geometries such as plane, circle, shape, cube,

sphere, cylinder, Torus, TorusKnot, and PolyHedron.

Chapter 6, Using Advanced Geometries and Binary Operations, continues where Chapter 5

left off. It shows you how to congure and use the more advanced geometries that are

provided by the Three.js library such as Convex and Lathe. In this chapter you'll also

learn how to extrude 3D geometries from the 2D shapes and how you can create new

geometries by combining geometries using binary operations.

Chapter 7, Particles and the Particle System, explains how to use the particle system

from the Three.js library. You'll learn how to create a particle system from scratch,

and from the existing geometries. In this chapter you'll also learn how you can

modify the way the particles look through the use of sprites and particle materials.

Chapter 8, Creating and Loading Advanced Meshes and Geometries, shows you how to

import meshes and geometries from external sources. You'll learn how to use the

Three.js library internal JSON format in order to save the geometries and scenes. This

chapter also explains how to load models from formats like OBJ, DAE, STL, CTM,

and PLY.

Chapter 9, Animations and Moving the Camera, explores the various types of animations

that you can use to make your scene come to life. You'll learn how to use the Tween.

js library together with Three.js, and you'll learn how to work with the animation

models based on morphs and skeletons.

Chapter 10, Loading and Working with Textures, expands on Chapter 4 where materials

were introduced. In this chapter we will dive into the details of textures. It introduces

the various types of textures that are available and how you can control a texture that

is applied to your mesh. Additionally in this chapter, you are shown how you can

directly use the output from the HTML5 video and canvas elements as input for

your textures.

Preface

[ 3 ]

Chapter 11, Custom Shaders and Render Post Processing, explores how you can use the

Three.js library to apply the post processing effects to your rendered scene. With post

processing you can apply effects, such as blur, tilt shift, and sepia to your rendered

scene. Besides this, you'll also learn how to create your own post processing effect

and create a custom vertex and fragment shader.

Chapter 12, Adding Physics to Your Scene with Physijs, explains how you can add

physics to your Three.js scene. With physics, you can detect collisions between

objects, make them respond to gravity, and apply friction. This chapter shows

how to do so with the Physics JavaScript library.

What you need for this book

All that you need for this book is a text editor (for example, Sublime Text Editor) to

play around with the examples and a modern web browser to access the examples.

Some examples require a local web server, but you'll learn in Chapter 1 how to set up

a very lightweight web server to use with the examples in this book.

Disclaimer:

Before we get started, a quick note on possible problems with the

examples in this book. In Chapter 1 we give an overview of the browser

support for WebGL, which is needed for Three.js. Modern browsers such

as Chrome, Firefox, and Internet Explorer have good support for this

standard. There is, however, something you need to take into account.

When newer versions of browsers appear, they sometimes break support

for specic features of WebGL. For instance, as of nalizing this book,

Chrome and Firefox on Windows 7 have issues with the examples of

Chapter 11. So make sure to upgrade to the latest versions of Chrome and

Firefox before trying these examples.

Who this book is for

This book is great for everyone who already knows JavaScript and wants to

start with creating 3D graphics that run in any browser. You don't need to know

anything about advanced math or WebGL, all that is needed is a general knowledge

of JavaScript and HTML. The required materials and examples can be freely

downloaded and all the tools used in this book are open source. So if you've ever

wanted to learn how to create beautiful, interactive 3D graphics that run in any

modern browser, this is the book for you.

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探索开源Three.js：WebGL的JavaScript 3D编程指南

THREE.js中文教程PDF版附带源码

（高清原版）Learning Three.js The JavaScript 3D Library for WebGL(2nd).pdf

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关于three.js的参考文献

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def update(self, s0, a0, r, s1, a1): td_error = r + self.gamma * self.Q_table[s1, a1] - self.Q_table[s0, a0] self.Q_table[s0, a0] += self.alpha * td_error 解释

请设计一个5层全连接网络，损失函数自由，但是激励函数使用sigmoid/tanh/relu，反向传播过程自己写，不能使用pytorch框架的自动求导机制，目标是实现如下函数： y=x2+2x-3

nlp + rl. prom

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解释attitude数据集中的“rating=63.53570++0.63187complaints +-0.53005learning-1.44649advance +0.63187 learning*advance”模型，详细说明