[add 3D FFT visualizer]

The introduction of the <canvas> tag into the HTML5 specification allowed Processing to be ported to JavaScript, thus enabling users to run 2D sketches within the browser without additional plug-ins. At the time when porting began, there still was no plug-in free method of delivering 3D content. This limited Processing.js to 2D until WebGL was introduced. Once WebGL was implemented on pre-release versions of Firefox, Safari and Chrome, it became a viable candidate for use in Processing.js to render 3D sketches. Additionally, since WebGL closely matches OpenGL which is used by Processing, it substantially aided the porting process.