Click the button in the ribbon to invoke the command "nsobLabelContours", and pick multiple points to define a fence across polylines or polylines in XRefs.

Press "S" for the Settings option so the user can set to Major & Minor contour Layer filters, Block Mode, Skip Minor Mode and preferred Text Style to use.

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin.

You may need to restart the Autodesk product to activate the app/plug-in.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

Update version: now include Spline entities, and optional user-Layer.

Spline entities are now added, 3D Polylines are supported, except that if its vertices elevations are not all the same, it will only grab the first vertex elevation. It supports LWPolylines as well as the old legacy 2D Polylines.

Lines are not supported. May not work when solid hatch are under target entities.

May not work if viewport zoomfactor is too far.