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

Sound basics

From a physical point of view, sound is a wave of air density changing, which propagates in the space from the sound source to our ears. In computers and other digital devices, a sound is represented as an array of numbers which describe the sound wave amplitude at discrete moments in time. These numbers are called digital audio samples.


Digital sound representation using audio samples is called Pulse Code Modulation (PCM). It is a historical term, meaning that we code the amplitudes using digital numbers.

An array of audio samples with additional information such as its discretization time step and number of channels (mono, stereo, and so on) is called a sound sample. Sound samples can be used as the elementary bricks for construction of sound and music. The most notable example is hip-hop music, which is based on samples. Many computer games also use samples for sounding player actions.

openFrameworks has good capabilities for playing samples. So using samples is a simple...