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OpenFrameworks Essentials

OpenFrameworks Essentials

By : Denis Perevalov
5 (7)
Buy this Book
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OpenFrameworks Essentials

OpenFrameworks Essentials

5 (7)
By: Denis Perevalov
Buy this Book

Overview of this book

If you are a programmer, visual artist, or designer with experience in creative coding, and want to use openFrameworks to create fun, stunning, and interactive applications, this is the book for you. Basic knowledge of programming languages, such as C++, Java, Python, or JavaScript, will be enough to proceed with the book.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Getting Started with openFrameworks
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1. Getting Started with openFrameworks
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What is openFrameworks?
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Installing openFrameworks
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Running your first example
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The video synthesizer application
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Summary
2
2. Creating Your First openFrameworks Project
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2. Creating Your First openFrameworks Project
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Creating and running a new project
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Discovering the project's code structure
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Setting up the screen
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Centering the coordinate system
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A simple drawing
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Geometric patterns
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Summary
3
3. Adding a GUI and Handling Keyboard Events
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3. Adding a GUI and Handling Keyboard Events
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Creating a GUI using the ofxGui addon
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Implementing a simple GUI panel with sliders
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Implementing the autosave feature
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Creating groups of controls
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Implementing a checkbox, a color selector, and a 2D slider
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Handling keyboard events
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Implementing the matrix pattern generator
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Summary
4
4. Working with Raster Graphics – Images, Videos, and Shaders
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4. Working with Raster Graphics – Images, Videos, and Shaders
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Raster images in openFrameworks
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Drawing an image file
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Playing a video file
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Grabbing a live video from a camera
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Mixing layers using additive blending
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Creating the video effect with a shader
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Summary
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5. Creating 3D Graphics
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5. Creating 3D Graphics
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Introduction to 3D graphics with openFrameworks
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Drawing a wireframe sphere
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Creating a camera
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Drawing a solid sphere
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Texturing the sphere
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Mixing 2D and 3D with the GUI
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Deforming a sphere
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Summary
6
6. Animating Parameters
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6. Animating Parameters
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Using time values for a parameter's automation
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Using the level of sound for a parameter's automation
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Capturing sound from a sound card's input and measuring its level
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Reading data from a text file
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Controlling automation
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Summary
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7. Distributed and Physical Computing with Networking and Arduino
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7. Distributed and Physical Computing with Networking and Arduino
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Distributed computing with networking
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Networking in openFrameworks
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Implementing the OSC messages receiver
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Creating an OSC sender with openFrameworks
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Creating OSC senders with TouchOSC, Python, and Max/MSP
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Physical computing with Arduino
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Programming an Arduino board
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Summary
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8. Deploying the Project on iOS, Android, and Raspberry Pi
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8. Deploying the Project on iOS, Android, and Raspberry Pi
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Running the project on an iOS device
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Deploying the project on an iOS device
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Running the project on an Android device
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Running the project on Raspberry Pi
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Summary
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9. Further Resources
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9. Further Resources
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Enhancing the video synthesizer project
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Getting more information on openFrameworks
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Debugging and speeding up your code
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Summary
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A. Video Synthesizer Reference
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A. Video Synthesizer Reference
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The desktop version
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iOS and Android versions
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Raspberry Pi version
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Summary
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B. openFrameworks Quick Reference
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B. openFrameworks Quick Reference
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Application
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2D drawing
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The GUI
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Multimedia and other classes
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Mathematical, timer, and conversion functions
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Summary
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Index
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Index

Creating a camera

One of the advantages of 3D graphics over 2D graphics is the possibility of walking through the virtual scene and rotating objects in a way we do in real life. So the user feels as though he or she were inside that scene, observing real objects. The navigating in space is achieved using a camera. It is a special object that controls the way of projecting 3D points to 2D points on the screen.

Tip

There are two types of projections from 3D to 2D:

  • Perspective projection: Far-off objects look smaller than nearby objects. This is the type of projection used in openFrameworks by default.
  • Orthogonal projection: The visible size of an object does not depend on the distance to the viewer.

In openFrameworks, a camera can be represented by the ofCamera class or the ofEasyCam class. The first class is a quite general camera class, and the second one extends it by implementing a number of additional capabilities, including handling mouse events for controlling the camera.

Tip

To enable orthogonal...

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Tech Concepts
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Programming languages
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OpenFrameworks Essentials
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