The following group codes apply to ray entities.
Ray group codes
Group code
Description
100
Subclass marker (AcDbRay)
10
Start point (in WCS)
DXF: X value; APP: 3D point
20, 30
DXF: Y and Z values of start point (in WCS)
11
Unit direction vector (in WCS)
DXF: X value; APP: 3D vector
21, 31
DXF: Y and Z values of unit direction vector (in WCS)