for the sphere one, you can also comment out/delete the line
approx line 359.
What did you set res at? 250? (line 49) you end up with roughly (res * 2)^2 verts, the more verts the slower it will be. Knowing what I know now there is probably a better way to do it.
For the attractor one, a couple of things might be up:
1) I built it in a subdirectory of myApps, so the paths are off. This is my mistake. It is fixable manually but its a bit of a pain, I have put a new version up on github that has been built in myApps. You might be able to get away with putting it in a sub directory, e.g. myApps/pete/attractor_field/ but not sure.
2) can you make sure the addons and oF stuff are being found correctly? In xcode if you click the grey arrows in the project navigator make sure none of the file names are in red.
Again this is probably a side effect of me being silly and having it in a subdirectory. If they are red, right click the folder (eg ofxBlur, ofxOpenCv etc), click delete, click remove references, then in finder navigate to your oF addons folder and drag the addon to xcode project navigator and put it under the addons section. I think if you check out the new version from github the addons should turn up as expected (assuming u have them installed).
I'm not sure what is up with the parallel reduction one, as its a really simple one. it should be runnable from the myApps directory.
Thanks for sticking with this.