Intro to openFrameworks


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This workshop was given at FITC Toronto 2012. Most of the details were shared by browsing code and talking together, so there isn't very much "content" in the slides themselves.

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Intro to openFrameworks

  1. 1. Intro to openFrameworks
  2. 2. 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
  3. 3. Intros Me − −!/kcimc You − Name − Experience level − What you want to make with OF
  4. 4. Lets go!
  5. 5. aka or ks am ew nF r o pe ur deT o
  6. 6. aka meopenFrameworks safari
  7. 7. 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 cant 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)
  8. 8. OF Inspiration Lets check out some awesome OF work! openFrameworks on Vimeo openFrameworks on Flickr openFrameworks on Creative Applications
  9. 9. 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
  10. 10. OF Syntax Its 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...
  11. 11. 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 dont 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
  12. 12. 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.
  13. 13. 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, were continually working to bring in more.
  14. 14. Running and Modifying Examples imageSequenceExample noiseField2dExample videoGrabberExample asciiVideo pointPickerExample ...
  15. 15. Using Addons and Contributed Code Sometimes people share their entire project! rise and fall perfume-global face++ and feedrdio ...
  16. 16. Using Addons and Contributed Code Q: Why is openFrameworks amazing? A: ofxAddons − ofxBox2D − ofxKinect − ofxFft − ofxCv − ...
  17. 17. Getting Started on a Project / Hacking Together What project do you want to make? Lets brainstorm about what you need to make it happen. What techniques do you want to play with? Lets see if theres something out there that you can wrap or use.