From VRML 2 Basic Concepts and Definitions CPS616 -- Information Track of CPS -- Spring Semester 98. byZeynep Ozdemir, Rob Baker, Meryem Ispirli, Geoffrey C. Fox (Definition and Example)
rotation field of the Transform node provide the rotation operation.
First three values defines the rotation axis which is an imaginary line about which a coordinate system is rotated.
To define an axis it is necessary to specify the two end points in the 3D coordinate system.
The First point comes from the center field of the Transform node and the other end point's coordinate values come from the rotation field.