The Patch command requires that one or more database curves or boundaries be selected prior to being available. Additional curves or boundaries can be selected within the command. This command is useful for easily creating surfaces that patch holes in database geometry models using arbitrary intersecting sets of database curves or boundaries. More than one surface may be generated from a given set of database curves or boundaries. Database boundaries (u-min, u-max, v-min and v-max curves) are also created and are considered child entities to the coons surface.


Tip: Patch surfaces are excellent for quickly filling gaps and holes in your database geometry.

Select the set of bounding database curves or boundaries from which you wish to create a new surface. Go to Create, Patch. Click on Generate Surfaces. Click on OK to save the new database surface and close the panel.

Use the Patch command to repair geometry holes using sets of intersecting curves.

The Patch panel provides a table at top listing the number of curves and boundaries selected, the number of pending Coons Patches and Trimmed Planes, and the total number of surfaces generated from the selected database curves or boundaries. A Boundary Tolerance frame allows you to change the Tolerance away from the default value of 0.001 when the set of curves is not producing a valid surface. Uncheck Use Default to enter a custom value.

Manual Side Definition
Use the Manual Side Definition frame to explicitly define your surface edges.

The Manual Side Definition frame provides tools to manually assemble edges of a surface providing more explicit control over the surface definition.

  • Remove Last Curve: removes the previously added curve or boundary from the definition of the current surface side.
  • Remove All Curves: removes all of the curves or boundaries from the definition of the current surface side.
  • Next Side: saves the definition of the current side and moves on to the next.
  • Previous Side: drops any definition of the current side and reverts control to the previous side in the surface. Use this command when you discover an error or omission in your previously defined side.

Below the Manual Side Definition frame, the Generate Surfaces command creates the candidate database surface or surfaces from the selected set of database curves and/or boundaries along with the currently specified Tolerance.


Creating a Coons Patch

Removing Model Discontinuities for Meshing