To get greatest comfort, you don't really want to minimize roll, you
want to make sure that the total force vector that the pilot is
influenced by matches the downward direction of the ship. For example,
if the ship makes a sharp turn (to the side), then you actually desire
roll, because the centrifugal force is added to the regular gravity
force, and the total force is then not straight -y but some slanted
direction, and you want the roll of the ship to match that, so that the
pilot isn't thrown sideways in the cockpit.

You can't compute these kind of things with a simple transform. You have
to consider the force vectors influencing the ship, and based on those
find the optimal roll at the given time. Another thing to take into
account is that a too fast roll may not be very comfortable. The point
I'm coming to is that you need a dynamic simulation that for any given
time considers the direction, the speed, the curvature of the path, and
the current alignment and calculates the roll based on that. Of course,
this may be overkill for what you want to do.

Rune
--
3D images and anims, include files, tutorials and more:
rune|vision:  http://runevision.com (updated Oct 19)
POV-Ray Ring: http://webring.povray.co.uk

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