CAD > Snap > Z-Grid Snap

Snap to a z-grid spacing.

If the pick-box is located over the corner of an entity, that corner will be selected.

Otherwise the nearest point at the y-grid spacing on the nearest edge will be selected.

The pick-box must be located over an entity or construction line.

Since the z coordinate values are constrained to the prescribed Z-grid spacing, the x and y coordinate values are calculated from the equation of the selected line.

The grid spacing and location are defined either by picking the Z-Grid Snap button a second time or use

CAD > Snap > Cursor/Grid Setup   setup the cursor/grid spacing and orientation.

Z-grid snap can be used in conjunction with any of:

CAD > Snap > None   Disable snapping.

CAD > Snap > Edge   Snap to the nearest edge.

CAD > Snap > Tangent Snap   Force cursor tangent to the selected edge.