Stipple Effect or Wall Street Journal Hedcut Effect

I’m trying to create a Stipple Filter or WSJ Hedcut Filter for an installation of mine.
References below:

http://graphicssoft.about.com/od/aboutgraphics/qt/kevinsprouls.htm
http://www.alleba.com/blog/2006/12/20/photoshop-tutorial-the-hedcut-effect/
http://www.nolinovak.com/

Has anyone done this using OF before or have any source codes to share for this?

I would use a fragment shader to do this. There’s actually a really great and thorough tutorial on doing this http://www.yaldex.com/open-gl/ch18lev1sec1.html

This addon might be helpful for doing volumetric shader too: http://forum.openframeworks.cc/t/developing-quot;ofxvolumetricsquot;/7126/0

Hope that helps point you in the right direction.

maybe one of these dithering algorithms could fit what you need? http://en.wikipedia.org/wiki/Dither#Algorithms
This article even comes with the algo: http://en.wikipedia.org/wiki/Floyd%E2%80%93Steinberg-dithering

I had a reply pointing some shader code marked as spam I think but it pointed to this: http://www.yaldex.com/open-gl/ch18lev1sec1.html