The coordinate system is not relative to a bounding box. Values are interpreted directly in local space.
The coordinate system is relative to a bounding box: 0 indicates 0 percent of the bounding box, and 1 indicates 100 percent of the bounding box. For example, (0.5, 0.5) describes a point in the middle of the bounding box, and (1, 1) describes a point at the bottom right of the bounding box.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)