Interested in seeing how IntelliCAD is used for surface modeling and contours? ITC member MicroSurvey released several related videos for MicroSurvey CAD 2016, which is based on IntelliCAD. For more details, see http://helpdesk.microsurvey.com/index.php?/News/NewsItem/View/232 and http://www.microsurvey.com/downloads/movies/mscad.htm#Movies_Contours.
MicroSurvey: www.microsurvey.com
IntelliCAD Technology Consortium: www.intellicad.org