Start by connecting your survey cogo points into a 3D polyline. If the points are sequential you can use the transparent 'pn command in c3d after invoking the 3dpoly command to generate the pline from the cogo point numbers.

To improve upon the results invoke the TLLazySurveyor command and experiment with different values for the 'step' parameter. The app will generate a smooth version of your original pline with additional vertices 'step' units apart. The original 3d vertices will be preserved. The default mode is 'spline' which creates a smooth pline. If this mode does not produce satisfactory results a 'linear' mode is also supported which will preserve the individual pline segments.

The generated 3d plines can then be used to model a surface or any other c3d entity.

Note: Exercise caution when using this tool and use your professional judgment in each individual case as this is no substitute or remedy for a poor survey.

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.

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.