Intro to openFrameworks

Overview

Intros from me, and you

OF history and inspiration

OF structure and syntax

Running and modifying the examples

Using addons and contributed code

Getting started on a project you want to make

Intros

Me
− http://kylemcdonald.net/
− https://twitter.com/#!/kcimc

You
− Name
− Experience level
− What you want to make with OF

aka or ks
am ew
nF r
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aka

me

openFrameworks safari

A (Rough) History of OF
− Pre-2003: ACU library at MIT

Inspired Processing via Ben Fry and Casey Reas

Golan Levin also studies at MIT, uses ACU to teach
− Zach Lieberman studies under Golan

Zach can't teach ACU, develops OF
− Theo Watson studies under Zach (2004+)

Theo does OSX, Zach does Windows
− Arturo Castro meets Zach + Theo (2007/8?)

Arturo ports to Linux, joins the OF core team
− OF lab (Ars Electronica 2008)
− OF dev conferences (2011 Pittsburgh, 2012
Detroit)

OF Inspiration

Let's check out some awesome OF work!

openFrameworks on Vimeo

openFrameworks on Flickr

openFrameworks on Creative Applications

OF Structure

OF is a bunch of classes and functions that
simplify things by reducing the amount of code
you have to write

The “core” of OF is in libs/openFrameworks/

A good way to see everything in one place is
the OF reference

Some more notes on folder structure

OF Syntax

It's just C++ syntax, except for the “of” prefixes
and some other minor conventions

Some great resources for learning C++ at the
bottom of the about page

So...

C++ Syntax

<> are for templates, called “generics” in java

. (dot operator) is for accessing children of
objects, :: (colon colon) is for classes and
namespace access

You don't normally use an “int[] arr;” like in
Processing, you have to use a “vector<int>
arr;”

Operator overloading means you can use
complex types with mathematical notation: for
example, ofVec2f

Comparison to other Environments

Cinder has a steeper learning curve, but was
created by “real” programmers

Pocode is more like Flash in having a scene
graph, where everything is drawn implicitly

Processing is most similar, but the community
is more focused on sketches than addons.

Running and Modifying Examples

007 and before, everything is in
apps/examples/ and apps/addonsExamples

0071 and after, everything is in examples/

There are a lot more examples online, we're
continually working to bring in more.

Running and Modifying Examples

imageSequenceExample

noiseField2dExample

videoGrabberExample

asciiVideo

pointPickerExample

...

Using Addons and Contributed
Code

Sometimes people share their entire project!

rise and fall

perfume-global

face++ and feedrdio

...

Using Addons and Contributed
Code

Q: Why is openFrameworks amazing?

A: ofxAddons
− ofxBox2D
− ofxKinect
− ofxFft
− ofxCv
− ...

Getting Started on a Project /
Hacking Together

What project do you want to make? Let's
brainstorm about what you need to make it
happen.

What techniques do you want to play with?
Let's see if there's something out there that
you can wrap or use.

Intro to openFrameworks

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