WebGL Beginner's Guide. If you’re a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here

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Autorzy:: Diego Cantor, Brandon Jones, Khronos

WebGL Beginner's Guide. If you’re a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here Diego Cantor, Brandon Jones, Khronos - okladka książki

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Opis książki : WebGL Beginner's Guide. If you’re a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here

WebGL is a new web technology that brings hardware-accelerated 3D graphics to the browser without installing additional software. As WebGL is based on OpenGL and brings in a new concept of 3D graphics programming to web development, it may seem unfamiliar to even experienced Web developers.Packed with many examples, this book shows how WebGL can be easy to learn despite its unfriendly appearance. Each chapter addresses one of the important aspects of 3D graphics programming and presents different alternatives for its implementation. The topics are always associated with exercises that will allow the reader to put the concepts to the test in an immediate manner.WebGL Beginner's Guide presents a clear road map to learning WebGL. Each chapter starts with a summary of the learning goals for the chapter, followed by a detailed description of each topic. The book offers example-rich, up-to-date introductions to a wide range of essential WebGL topics, including drawing, color, texture, transformations, framebuffers, light, surfaces, geometry, and more. With each chapter, you will level upù your 3D graphics programming skills. This book will become your trustworthy companion filled with the information required to develop cool-looking 3D web applications with WebGL and JavaScript.

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O autorach książki

Diego Cantor received his M.Eng. in Systems and Computer Engineering from Universidad de Los Andes (Colombia), and his Ph.D. in Biomedical Engineering from Western University (Canada). He published the first-ever online beating heart and brain cortex map using WebGL. He is also the author of the WebGL Beginner's Guide which sold internationally in English, Korean and Chinese. Diego is passionate about open source and web technologies, and he has worked extensively in medical imaging technologies. In his free time, he enjoys working out, classical music and learning new languages.

Brandon Jones has been developing WebGL demos since the technology first began appearing in browsers in early 2010. He finds that its the perfect combination of two aspects of programming that he loves, allowing him to combine eight years of web development experience and a life-long passion for real-time graphics. Brandon currently works with cutting-edge HTML5 development at Motorola Mobility.

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Tytuł oryginału:: WebGL Beginner's Guide. If you’re a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here.
ISBN Ebooka:: 978-18-496-9173-4, 9781849691734
Data wydania ebooka :: 2012-06-15 Data wydania ebooka często jest dniem wprowadzenia tytułu do sprzedaży i może nie być równoznaczna z datą wydania książki papierowej. Dodatkowe informacje możesz znaleźć w darmowym fragmencie. Jeśli masz wątpliwości skontaktuj się z nami sklep@helion.pl.
Język publikacji:: 1
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Rozmiar pliku ePub:: 12.3MB
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Spis treści książki

WebGL Beginners Guide
- Table of Contents
- WebGL Beginner's Guide
- Credits
- About the Authors
- Acknowledgement
- About the Reviewers
- www.PacktPub.com
  - Support files, eBooks, discount offers, and more
    - Why Subscribe?
    - Free Access for Packt account holders
- Preface
  - What this book covers
  - What you need for this book
  - Who this book is for
  - Conventions
  - Time for action heading
    - What just happened?
    - Have a go hero heading
  - Reader feedback
  - Customer support
    - Downloading the example code
    - Downloading the color images of this book
    - Errata
    - Piracy
    - Questions
- 1. Getting Started with WebGL
  - System requirements
  - What kind of rendering does WebGL offer?
  - Structure of a WebGL application
  - Creating an HTML5 canvas
  - Time for action creating an HTML5 canvas
    - What just happened?
    - Defining a CSS style for the border
    - Understanding canvas attributes
    - What if the canvas is not supported?
  - Accessing a WebGL context
  - Time for action accessing the WebGL context
    - What just happened?
  - WebGL is a state machine
  - Time for action setting up WebGL context attributes
    - What just happened?
    - Using the context to access the WebGL API
  - Loading a 3D scene
    - Virtual car showroom
  - Time for action visualizing a finished scene
    - What just happened?
  - Summary
- 2. Rendering Geometry
  - Vertices and Indices
  - Overview of WebGL's rendering pipeline
    - Vertex Buffer Objects (VBOs)
    - Vertex shader
    - Fragment shader
    - Framebuffer
    - Attributes, uniforms, and varyings
  - Rendering geometry in WebGL
    - Defining a geometry using JavaScript arrays
    - Creating WebGL buffers
      - Operations to manipulate WebGL buffers
    - Associating attributes to VBOs
      - Binding a VBO
      - Pointing an attribute to the currently bound VBO
      - Enabling the attribute
    - Rendering
      - The drawArrays and drawElements functions
        
        Using drawArrays
        
        Using drawElements
  - Putting everything together
  - Time for action rendering a square
    - What just happened?
    - Have a go hero changing the square color
  - Rendering modes
  - Time for action rendering modes
    - What just happened?
  - WebGL as a state machine: buffer manipulation
  - Time for action enquiring on the state of buffers
    - What just happened?
    - Have a go hero add one validation
  - Advanced geometry loading techniques: JavaScript Object Notation (JSON) and AJAX
    - Introduction to JSON JavaScript Object Notation
      - Defining JSON-based 3D models
      - JSON encoding and decoding
  - Time for action JSON encoding and decoding
    - What just happened?
    - Asynchronous loading with AJAX
      - Setting up a web server
      - Working around the web server requirement
  - Time for action loading a cone with AJAX + JSON
    - What just happened?
    - Have a go hero loading a Nissan GTX
  - Summary
- 3. Lights!
  - Lights, normals, and materials
    - Lights
    - Normals
    - Materials
  - Using lights, normals, and materials in the pipeline
    - Parallelism and the difference between attributes and uniforms
  - Shading methods and light reflection models
    - Shading/interpolation methods
      - Goraud interpolation
      - Phong interpolation
    - Light reflection models
      - Lambertian reflection model
      - Phong reflection model
  - ESSLOpenGL ES Shading Language
    - Storage qualifier
    - Types
    - Vector components
    - Operators and functions
    - Vertex attributes
    - Uniforms
    - Varyings
    - Vertex shader
    - Fragment shader
  - Writing ESSL programs
    - Goraud shading with Lambertian reflections
  - Time for action updating uniforms in real time
    - What just happened?
    - Have a go hero moving light
    - Goraud shading with Phong reflections
  - Time for action Goraud shading
    - What just happened?
    - Phong shading
  - Time for action Phong shading with Phong lighting
    - What just happened?
  - Back to WebGL
    - Creating a program
    - Initializing attributes and uniforms
  - Bridging the gap between WebGL and ESSL
  - Time for action working on the wall
    - What just happened?
  - More on lights: positional lights
  - Time for action positional lights in action
    - What just happened?
    - Nissan GTS example
  - Summary
- 4. Camera
  - WebGL does not have cameras
  - Vertex transformations
    - Homogeneous coordinates
    - Model transform
    - View transform
    - Projection transform
    - Perspective division
    - Viewport transform
  - Normal transformations
    - Calculating the Normal matrix
  - WebGL implementation
    - JavaScript matrices
    - Mapping JavaScript matrices to ESSL uniforms
    - Working with matrices in ESSL
  - The Model-View matrix
    - Spatial encoding of the world
      - Rotation matrix
      - Translation vector
      - The mysterious fourth row
  - The Camera matrix
    - Camera translation
  - Time for action exploring translations: world space versus camera space
    - What just happened?
    - Camera rotation
  - Time for action exploring rotations: world space versus camera space
    - What just happened?
    - Have a go hero combining rotations and translations
    - The Camera matrix is the inverse of the Model-View matrix
    - Thinking about matrix multiplications in WebGL
  - Basic camera types
    - Orbiting camera
    - Tracking camera
      - Rotating the camera around its location
      - Translating the camera in the line of sight
      - Camera model
  - Time for action exploring the Nissan GTX
    - What just happened?
    - Have a go hero updating light positions
  - The Perspective matrix
    - Field of view
    - Perspective or orthogonal projection
  - Time for action orthographic and perspective projections
    - What just happened?
    - Have a go hero integrating the Model-view and the projective transform
  - Structure of the WebGL examples
    - WebGLApp
    - Supporting objects
    - Life-cycle functions
      - Configure
      - Load
      - Draw
    - Matrix handling functions
      - initTransforms
      - updateTransforms
      - setMatrixUniforms
  - Summary
- 5. Action
  - Matrix stacks
  - Animating a 3D scene
    - requestAnimFrame function
    - JavaScript timers
  - Timing strategies
    - Animation strategy
    - Simulation strategy
    - Combined approach: animation and simulation
    - Web Workers: Real multithreading in JavaScript
  - Architectural updates
    - WebGLApp review
    - Adding support for matrix stacks
    - Configuring the rendering rate
    - Creating an animation timer
  - Connecting matrix stacks and JavaScript timers
  - Time for action simple animation
    - What just happened?
    - Have a go hero simulating dropped and frozen frames
  - Parametric curves
    - Initialization steps
    - Setting up the animation timer
    - Running the animation
    - Drawing each ball in its current position
  - Time for action bouncing ball
    - What just happened?
  - Optimization strategies
    - Optimizing batch performance
    - Performing translations in the vertex shader
  - Interpolation
    - Linear interpolation
    - Polynomial interpolation
    - B-Splines
  - Time for action interpolation
    - What just happened?
  - Summary
- 6. Colors, Depth Testing, and Alpha Blending
  - Using colors in WebGL
  - Use of color in objects
    - Constant coloring
    - Per-vertex coloring
    - Per-fragment coloring
  - Time for action coloring the cube
    - What just happened?
  - Use of color in lights
    - Using multiple lights and the scalability problem
      - How many uniforms can we use?
      - Simplifying the problem
  - Architectural updates
    - Adding support for light objects
      - Improving how we pass uniforms to the program
  - Time for action adding a blue light to a scene
    - What just happened?
    - Have a go hero adding interactivity with JQuery UI
    - Using uniform arrays to handle multiple lights
      - Uniform array declaration
      - JavaScript array mapping
  - Time for action adding a white light to a scene
  - Time for action directional point lights
    - What just happened?
  - Use of color in the scene
    - Transparency
    - Updated rendering pipeline
  - Depth testing
    - Depth function
  - Alpha blending
    - Blending function
    - Separate blending functions
    - Blend equation
    - Blend color
    - WebGL alpha blending API
    - Alpha blending modes
      - Additive blending
      - Subtractive blending
      - Multiplicative blending
      - Interpolative blending
  - Time for action blending workbench
    - What just happened?
  - Creating transparent objects
  - Time for action culling
    - What just happened?
  - Time for action creating a transparent wall
    - What just happened?
  - Summary
- 7. Textures
  - What is texture mapping?
  - Creating and uploading a texture
  - Using texture coordinates
  - Using textures in a shader
  - Time for action texturing the cube
    - What just happened?
    - Have a go hero try a different texture
  - Texture filter modes
  - Time for action trying different filter modes
    - What just happened?
      - NEAREST
      - LINEAR
    - Mipmapping
      - NEAREST_MIPMAP_NEAREST
      - LINEAR_MIPMAP_NEAREST
      - NEAREST_MIPMAP_LINEAR
      - LINEAR_MIPMAP_LINEAR
    - Generating mipmaps
  - Texture wrapping
  - Time for action trying different wrap modes
    - What just happened?
      - CLAMP_TO_EDGE
      - REPEAT
      - MIRRORED_REPEAT
  - Using multiple textures
  - Time for action using multitexturing
    - What just happened?
    - Have a go hero moving beyond multiply
  - Cube maps
  - Time for action trying out cube maps
    - What just happened?
    - Have a go hero shiny logo
  - Summary
- 8. Picking
  - Picking
  - Setting up an offscreen framebuffer
    - Creating a texture to store colors
    - Creating a Renderbuffer to store depth information
    - Creating a framebuffer for offscreen rendering
  - Assigning one color per object in the scene
  - Rendering to an offscreen framebuffer
  - Clicking on the canvas
  - Reading pixels from the offscreen framebuffer
  - Looking for hits
  - Processing hits
  - Architectural updates
  - Time for action picking
    - What just happened?
    - Picker architecture
  - Implementing unique object labels
  - Time for action unique object labels
    - What just happened?
    - Have a go hero clearing the scene
  - Summary
- 9. Putting It All Together
  - Creating a WebGL application
  - Architectural review
  - Virtual Car Showroom application
    - Complexity of the models
    - Shader quality
    - Network delays and bandwidth consumption
  - Defining what the GUI will look like
    - Adding WebGL support
  - Implementing the shaders
  - Setting up the scene
  - Configuring some WebGL properties
    - Setting up the camera
    - Creating the Camera Interactor
    - The SceneTransforms object
    - Creating the lights
    - Mapping the Program attributes and uniforms
    - Uniform initialization
  - Loading the cars
    - Exporting the Blender models
    - Understanding the OBJ format
    - Parsing the OBJ files
    - Load cars into our WebGL scene
  - Rendering
  - Time for action customizing the application
    - What just happened?
    - Have a go Hero flying through the scene
  - Summary
- 10. Advanced Techniques
  - Post-processing
    - Creating the framebuffer
    - Creating the geometry
    - Setting up the shader
  - Architectural updates
  - Time for action testing some post-process effects
    - What just happened?
    - Have a go hero funhouse mirror effect
  - Point sprites
  - Time for action using point sprites to create a fountain of sparks
    - What just happened?
    - Have a go hero bubbles!
  - Normal mapping
  - Time for action normal mapping in action
    - What just happened?
  - Ray tracing in fragment shaders
  - Time for action examining the ray traced scene
    - What just happened?
    - Have a go hero multiple spheres
  - Summary
- Index

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WebGL Beginner's Guide. If you’re a JavaScript developer who wants to take the plunge into 3D web development, this is the perfect primer. From a basic understanding of WebGL structure to creating realistic 3D scenes, everything you need is here

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