Book Image

Mastering openFrameworks: Creative Coding Demystified

By : Denis Perevalov
Book Image

Mastering openFrameworks: Creative Coding Demystified

By: Denis Perevalov

Overview of this book

openFrameworks is a powerful programming toolkit and library designed to assist the creative process through simplicity and intuitiveness. It's a very handy software library written in C++ to reduce the software development process, helping you to kick-start creative coding. With the help of C++ and shaders support, openFrameworks allows for the processing of all kinds of media information with your custom-developed algorithms at the lowest possible level, with the fastest speed. "Mastering openFrameworks: Creative Coding Demystified" will introduce you to a world of creative coding projects, including interactive installations, audio-visual, and sound art projects. You will learn how to make your own projects using openFrameworks. This book focuses on low-level data processing, which allows you to create really unique and cutting-edge installations and projects. "Mastering openFrameworks: Creative Coding Demystified" provides a complete introduction to openFrameworks, including installation, core capabilities, and addons. Advanced topics like shaders, computer vision, and depth cameras are also covered. We start off by discussing the basic topics such as image and video loading, rendering and processing, playing sound samples, and synthesizing new sounds. We then move on to cover 3D graphics, computer vision, and depth cameras. You will also learn a number of advanced topics such as video mapping, interactive floors and walls, video morphing, networking, and using geometry shaders. You will learn everything you need to know in order to create your own projects; create projects of all levels, ranging from simple creative-code experiments, to big interactive systems consisting of a number of computers, depth cameras, and projectors.
Table of Contents (22 chapters)
Mastering openFrameworks: Creative Coding Demystified
About the Author
About the Reviewers

Using OpenCV functions

OpenCV is a really huge library with hundreds of functions, including optical flow computing, feature detection and matching, and machine learning. Most of these functions are currently not wrapped in the addon ofxOpenCv. You can use these capabilities by calling the OpenCV functions directly, by performing the following steps:

  1. First, in the testApp.h file, add the following line after the line #include "ofxOpenCv.h", which instructs the compiler to use the OpenCV's namespace:

    using namespace cv;
  2. Now you can declare OpenCV's images, which are objects of the type Mat:

    Mat imageCV;
  3. For converting the ofxCv image image into imageCV, call the following function:

    imageCV = Mat( image.getCvImage() );

    Note, this is fast operation that does not involve copying of data. imageCV and image will share the same memory region with pixel values. So, we would suggest only using imageCV for reading and not for changing.


    We do not suggest the use of the setNativeScale() function for images...