UNDERLAY
 
 
 

The following group codes apply to underlays. In addition to the group codes described here, see Common Group Codes for Entities. For information about abbreviations and formatting used in this table, see Formatting Conventions in This Reference.

Underlay group codes

Group code

Description

100

Subclass marker (AcDbUnderlayReference)

340

The ID of the AcDbUnderlayDefinition object

10,20,30

The X,Y, and Z coordinates of the insertion point of the underlay. These are OCS/ECS coordinates

41,42,43

DXF: X, Y, and Z scale factors

50

Rotation Angle (in OCS/ECS. CCW from the coordinate system X axis and around the Z axis)

210,220,230

Normal vector (in WCS)

280

Flags

1 = Clipping is on

2 = Underlay is on

4 = Monochrome

8 = Adjust for background

281

Contrast (value between 20 and 100)

282

Fade (value between 0 and 80)

11, 21

Repeating: 2d points in OCS/ECS. If only two, then they are the lower left and upper right corner points of a clip rectangle. If more than two, then they are the vertices of a clipping polygon