Rotations about an arbitrary axis

[Dan Christensen]

In article <SPENCER.90Jun1121404 at spline.eecs.umich.edu> spencer at eecs.umich.edu (Spencer W. Thomas) writes:
>In article <1990May31.171937.14296 at watcgl.waterloo.edu> jdchrist at watcgl.waterloo.edu (Dan Christensen) writes:
>
>> But there is more than one rotation mapping a vector V1 to a vector V2.
>> The final result can be oriented in any way about V2.  The original
>> poster indicated that he wanted the one that rotates about V1xV2,
>> ie. the most "direct" rotation.  I don't think that your solution 
>> does this. 
>
>I agree that the problem, as I stated it, is ill-defined.  However, my
>solution definitely maps the normal vector onto itself, by
>construction.  

Sorry, your solution does work.  My point was that the problem was
ill-defined.  Thanks for working out the details.

Dan Christensen