Somebody (Erik Flister?) asked lately about the relationship between mouse movement and pointer movement. My answer for OSX was "i don't know or care". I just stumbled across this post from John Carmack:
<http://d43.me/blog/1205/the-cause-for-all-your-mac-os-x-mouse-annoyances/#comment-51313>
His post and all others in that thread say that OSX is especially bad at mapping physical mouse movement to cursor movement, and the main problem seems to be a lot of lag between action and reaction - at least 32 msecs, in addition to awkward mouse pointer acceleration curves.
The only solution on OSX afaik still would be to bypass the os and do low-level queries of USB data sent from the mouse directly:
<http://tech.groups.yahoo.com/group/psychtoolbox/message/13462>
-mario
<http://d43.me/blog/1205/the-cause-for-all-your-mac-os-x-mouse-annoyances/#comment-51313>
His post and all others in that thread say that OSX is especially bad at mapping physical mouse movement to cursor movement, and the main problem seems to be a lot of lag between action and reaction - at least 32 msecs, in addition to awkward mouse pointer acceleration curves.
The only solution on OSX afaik still would be to bypass the os and do low-level queries of USB data sent from the mouse directly:
<http://tech.groups.yahoo.com/group/psychtoolbox/message/13462>
-mario