Advanced Graphics Programming Using C/C++
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1 CORIOLIS GROUP BOOK Advanced Graphics Programming Using C/C++ Loren Heiny John Wiley & Sons, Inc. New York Chichester Brisbane Toronto Singapore
2 Contents Preface Who This Book Is For A Glance Inside What You'II Need About the Code Chapter 1 Introduction to Ray Tracing Capturing Images with Ray Tracing Tracing Light Rays Using a Camera Model From Rays to Images Representing a Scene A Simple Ray Tracing Program The Major Data Structures Specifying Colors Specifying Light Sources Specifying Objects Specifying Vectors and Points Describing the World Overview of SIMPLRAY The Main Function Generating Rays Getting Oriented Calculating a Ray Determining What a Ray Hits Working with Planes Representing a Ray Intersecting a Ray and a Plane Representing a Sphere Finding the Closest Object Calculating the Normal Chapter 2 Adding a Lighting Model A Good Lighting Model Ambient Intensity Diffuse Light Specular Light xiii xiii xiv xiv XV
3 vi Contents Adding the Light Components Multiple Light Sources Back to Tracing Rays Applying the Lighting Model Calculating the Ambient Color Calculating the Diffuse Color Scaling the Light Adding the Specular Component Calculating the Reflecting Ray Handling Shadows Tracing the Ray Setting the Pixel Compiling SIMPLRAY for DOS Compiling for Windows Choosing a Video Mode Setting the Video Mode DOS Versus Windows Applications Modifying SIMPLRAY Computing Power and Ray Tracing Chapter 3 An Enhanced Ray Tracer Using C++ Effectively Overview of the RAY Program The New Objects Deriving Rectangles Triangle Objects Supporting Spheres Ellipsoids Cylinder Objects Managing Objects An Enhanced Lighting Model New Light Sources Point Light Sources Directed Light Sources Cone Light Sources Scaling Light Managing 9 Light Sources Translucent Objects Antialiasing Bounding Boxes
4 Contents vii Building a Hierarchy of Objects 85 Supporting Bounding Boxes 86 Chapter 4 Creating a World 133 The Scene Description Language 133 The Parser 136 Reading Tokens 136 Parsing a File 137 Processing Parameters 138 Handling Nested Commands 138 Creating an Object 139 Grouping Objects 139 Handling Parser Errors 140 Using the Scene Description Language 140 Setting the Display Parameters 140 Setting the Viewing Parameters 141 Specifying Lights 142 Specifying Objects 142 Nesting Files 143 Saving an Image 143 Compiling and Using RAY 144 Sample Scenes 145 Things Are Shaping Up 145 Generating Swept Surfaces 146 Chapter 5 Textures and Patterns 173 Rendering a Pattern 173 Setting the Texture 174 Mapping onto Three-Dimensional Objects 175 Rendering a Checker Pattern 176 Mapping the Checker Pattern 177 Rendering Non-Checker Patterns 177 Mapping to Planar Objects 178 Mapping to a Rectangle 178 Mapping to a Sphere and Ellipse 180 Mapping to a Cylinder 181 Defining a Checker Pattern 182 Mapping Images 183 Managing Images 184 From Point to Pixel 185 Defining an Image Map 186
5 viii Contents Blended Colors A Textured Scene Constructing the Room Constructing the Cabinets Making the Soup Can Making a Pot Using Bounding Boxes Nothing's Perfect Chapter 6 Adding Animation Animation Overview Supporting Animation The Animating Structure Animating Objects Going the Next Step The Animation Language Specifying the Number of Frames Specifying a Motion Path Moving the Viewer Saving the Image Sequence Playing Back an Image Sequence An Animation Example Chapter 7 Rendering Water and Clouds Designing a Model of Water The Essence of Water Animating Waves Using Normals to Make Waves A Water Object Creating Waves Adding Water to a Scene Sample Water Scene A Watery Glass Extending the Water Model Rendering Clouds A Two-Dimensional Sky Implementing A Sky Plane Calculating the Texture Defining Two-Dimensional Clouds Cloudy Marble
6 Contents A ix Three-Dimensional Clouds Creating Three-Dimensional Clouds The Three-Dimensional Cloud Function Defining Clouds Sample Clouds Tips on Constructing Clouds Chapter 8 Rendering Fractal Mountains Rendering Natural Objects How Fractals Work Using Triangles Generating Mountains Reading the Initial Triangles Setting the Fractal Parameters Subdividing Triangles Writing the Triangles Setting the Color Generating a Random Number Using Bounding Boxes Compiling and Running GENMTN Designing Your Mountains Making More Interesting Images Chapter 9 A PCX Toolkit Overview of PCX Files The PCX File Format The PCX File Header Run-Length Encoding Decoding a PCX File The PCX Toolkit Processing the Header Initializing a Header Writing the Header Writing an Image Processing the Palette Reading a PCX File Reading a Header Reading the Image A Sample Read Function Testing PCXTOOL.C
7 x Contents Chapter 10 TIFF: A Flexible Image File Format TIFF Overview Working with Classes The Pieces of a TIFF File Working with Tags The Image Format The TIFF.C Toolkit Reading a TIFF File Processing the Tags Determining an Image's Size Reading the Image A High-Level Read Function Writing a TIFF File Writing the Image Data Testing the TIFF Tools Compiling and Running TESTTIFF Chapter 11 Image Processing Essentials Working with Images An Image Processing Toolkit Using Histograms Contrast Enhancement Brightness Adjustment Reducing Noise Sharpening an Image Zooming and Resizing Images Mirroring and Rotating Images Converting a Color Image to Grayscale Colorizing an Image Gamma Correction Testing IMTOOLS.C Chapter 12 Morphing Magic How Morphing Works Warping Images Mapping Images Creating a Simple Morphing Program Controlling the MORPH Program Initializing the Morphing Process Generating Images Moving the Triangle Patches
8 Contents xi Morphing the Images 360 Determining a Point in a Triangle 361 Generating the Output Color 362 Compiling MORPH 363 Using MORPH 363 Morphing Tips 365 Appendix A Vector Operations 377 Working with Vectors 377 Vector Operations 379 Appendix В A Graphics Toolkit 385 Setting the Mode 385 Setting a Pixel 386 Working with Colors 387 Supporting С and C++ Compilers 388 Appendix С Working with Windows 395 Overview of WINSHELL 395 Using WINSHELL 396 Preparing for Windows 396 Displaying an Image 396 Working with Colors 397 Compiling for Windows 397 Index 401
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