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

Image warping and video mapping

Until now, we drew images as rigid rectangles of arbitrary shapes. But there is a possibility to draw an image as if it were made from rubber. To achieve this effect, the image is decomposed into a mesh consisting of a number of triangles or quadrangles (quads). Each triangle or quad is rendered with an arbitrary position on its vertices while preserving adjacency relation in the mesh. This gives a rubbery effect to the image.


Another way to geometrically achieve image distortion is direct pixel modification of the image, which was discussed earlier. But for big images, such methods often work too slowly.

A faster way to draw images with arbitrary modification is using shaders (see the Creating video effects with fragment shaders section in Chapter 8, Using Shaders).

Such methods can be used for implementing the video mapping technology; also known as projection mapping. This technology involves the use of projectors for projecting images on non-flat surfaces...