thank you for your reply. I had already tried different values for the "Max Simultaneous Image Targets". Now I have done some more tests and it seems it has to do with the multitargets I have set up.
My two multitargets each consists of 10 imagetargets, arranged in a circle to form a cylinder. If I reduce them to 6 imagetargets each, I can track them both simultaneously but when I leave all 10 imagetargets in I get the situation I described in my earlier post.
My initial tests, with one cylinder, showed that I get a more stable tracking if I spilt the cylinder into 10 pieces, instead of only 6. But apparently, multitargets with more than 6 imagetargets have trouble tracking more than one at a time, even if I set the "Max Simultaneous Image Targets" value to 20. I think 10 should be enough though, as I will never see more than half the cylinder at once.
Is there a reason that image targets with more than 6 parts should behave differently?
Are they not a supported feature?
Maybe it is simply too many targets to track and simultaneously scan for new ones? I would have thought that the iPad2 is powerful enough for this.