New Codes for Quaternions

[derpmann]

Dear colleagues,
exchanging angle information needs some additional information about the order of rotation and the usage
of fix or rotating axes. This problem can be avoided by using 4 quaternions instead of 9 elements of a rotation matrix.
These quaternions have the unit [1] and are named qw, qx, qy, qz.
Therefor I propose the new Physical Dimension QU with the text "Quaternion" and the default unit "1".
To distinguish between the 4 quaternions we can use the Directions X, Y, Z and need
a new Direction W.

[Paul Wellicome]

proposed: to adopt QU, but to use X,Y,Z and 0.

All agreed. OLM 30 Jul 2009.

[DiVe]

Physical Dimension "QU" added in DB 1.6p2.
Item closed.