Automatic Small Curve Removal

The automatic small curve removal command uses composites and collapse curves commands to automatically remove small curves from a volume. This is useful for removing small or unnecessary details from a model to facilitate meshing algorithms. The user enters a small curve size. Any curve smaller than this specified size will be removed. This command is issued from the ITEM toolbar. More information can be found by reading the section entitled Small Details in the Model in the ITEM documentation. This command can also be called from the command line. The syntax of this command is:

To remove small curves from a volume

  1. On the Command Panel, click on Geometry and then Volume.
  2. Click on the Modify action button.
  3. Select Auto Clean from the drop-down menu.
  4. Enter in the appropriate values for Volume ID(s). This can also be done using the Pick Widget function.
  5. Enter in the appropriate value for Small Feature Threshold Size.
  6. Click Small Curves from the Select Auto Clean Method menu.
  7. Click Apply.

Auto_clean Volume <id_range> Small_curves Small_curve_size <val>

Note: The automatic curve removal should be used with caution, as the user has little control over how curves are removed.


The cylindrical model has 3 small curves just less than 0.7. The remove small curves command will remove two of the small curves by compositing two neighboring surfaces and the third using the collapse curve functionality.

auto_clean volume 1 small_curves small_curve_size .7

Figure 1. Automatic small curve removal on a cylinder