These papers discuss this topic well:
mecanum X & O square & rectangle
mecanum force vector analysis
Click on the links corresponding to these titles on this page:
http://www.chiefdelphi.com/media/papers/2390
Note that when most people talk about X & O orientation they tend to talk about a bird's eye view, whereas Ether in these papers refers to a worm's eye view. An X viewed from the top is the same setup as an O viewed from the bottom, and vice versa.
Quote:
Originally Posted by Pjdaley13
I thought x on the floor can still generate the same appropriate vectors but required more "intervention" with the standard code, reversing directions of wheels etc...
Pretty sure my team was at this point at one time...
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No amount of code will "fix" the issue. The mechanics of an O-oriented mecanum drive as viewed from the top will result in less optimal turning than an X-oriented mecanum drive. This is explained in the papers.