This data item defines a cylinder segment in space.
Other data items can check if nodes are located on this geometry.
The coordinate of the center point at the
bottom is *x_0 y_0 z_0*. The coordinate of the center point at the
top is *x_1 y_1 z_1*. The cylinder can only be used in 3D.
All **node** within a distance *tolerance* of the radius
are considered to be part of the cylinder.

tochnog 2001-09-02