• Automatic CAD-model Repair: Shell-Closure 

      Bohn, John Helge; Wozny, Michael J. (1992)
      Shell-closure is critical to the repair of CAD-models described in the .STL file-format, the de facto solid freeform fabrication industry-standard. Polyhedral CAD-models that do not exhibit shell-closure, i.e. have cracks, ...