Shap3d02.dat, 2nd 'shape' file for CPO3D

A cylinder of elliptical cross section created by stretching transversely

A cylinder is set up and the 'stretching' option is used to increase all x coordinates by a factor of 2, producing an elliptical cross section.

Note that the x=y plane of reflection symmetry is not used because the stretching is neither perpendicular nor parallel to this plane.

The equation for the section of the cylinder is

(x/a)**2 + (y/b)**2 = 1,

where a = b = 1 is the radius of the circular section. After stretching the x coordinates by a factor of 2 the value of a is effectively increased by this factor, producing an elliptical section.