2012

Table Of Contents
architectural plans, the PDF is a raster image, not a vector-based image.
Therefore, object snapping does not work. Also, geometry from PDFs that
were created outside of AutoCAD may contain nonstandard snapping points,
such as circles with no center points.
Use the DWFOSNAP, PDFOSNAP, DGNOSNAP, and UOSNAP system variables
to turn object snapping on and off.
Object snapping can also be turned on and off from a shortcut menu. Select
an underlay and right-click to display the object snap menu option.
To snap to a geometric point on an underlay
1 Move your cursor over the desired object snap location.
If UOSNAP is on, your cursor automatically locks onto the snap location
in the drawing.
2 Select an object in the drawing.
The cursor snaps to the eligible location closest to your selection.
Quick Reference
System Variables
DGNOSNAP
Determines whether object snapping is active for geometry in DGN underlays
that are attached to the drawing.
DWFOSNAP
Determines whether object snapping is active for geometry in DWF or DWFx
underlays that are attached to the drawing.
PDFOSNAP
Determines whether object snapping is active for geometry in PDF underlays
that are attached to the drawing.
UOSNAP
Determines whether object snapping is active for geometry in DWF, DWFx,
PDF, and DGN underlays that are attached to the drawing.
1900 | Chapter 37 Work with Data in Other Formats