Represents the "O" entry of the 3d cross section dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains an array which contains doubles, representing PDF numeric objects.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 311, page 532.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 322, page 665.

The O entry holds a three-element array specifying the orientation of the cutting plane. The values give the rotation around the X, Y, and Z axes in degrees respectively, defining the plane normal direction.