Repair Surfaces

Use the Surface Repair tools to find, review, and fix any geometric errors in the model's surfaces.

Note: These tools only works on visible surfaces.
  1. From the 2D ribbon, click the Surface Repair tool.
    Figure 1.

    By default, the Validate workflow opens on the secondary ribbon.
  2. Click on the guide bar to define which errors to check for. Expand each subsection to set methods and tolerances to automatically fix each error.
    • Error types can also be turned on or off from the legend.
    • As errors are fixed, the legend is automatically updated to reflect the changes. However, for larger models it can be useful to avoid updating checks for each fix/modification. If you turn Auto refresh checks off, you have to click on the guide bar of each associated tool to manually refresh the legend.
  3. Select surfaces to consider.
  4. Click Find.
  5. Click to automatically fix problems based on the defined checks, methods, and tolerances.
  6. To review and fix specific error types, do one of the following:
    • Select the associated tool from the secondary ribbon.
    • Click the error type in the legend.
  7. On the guide bar, navigate through and review each error using the arrows.
  8. Define any additional options then fix the errors in the following ways:
    • Click on highlighted errors in the modeling window to fix them one-by-one.
    • Click the button on the far right of the guide bar to fix all errors at once.
Note: If any error checks can not be fixed using the options provided in the Surface Repair tools, isolate them and fix them using the Edit Geometry tools.

Free Edges

Shows free edges in the displayed surfaces.

Use the microdialog to select a method for fixing them.
  • If the free edges form a loop, use the Patch Hole option to fix them.
  • If two edges are close by, the Stitch or Stitch and Intersect option to connect them within a given tolerance.

    You also have the option to only stitch open loops.

  • If surface are floating, use the Delete option to remove those surfaces.

Non-Manifold Edges

Shows non-manifold edges (edges where more than two surfaces are connected) in the displayed surfaces. You can fix them in this tool by deleting the surfaces attached to non-manifold edges.

  • Edges attached to baffles and interface surfaces are not considered here.
  • If you do not want to delete the surfaces, you can isolate them and fix them using the Stitch Surfaces tool in the Edit tool group by collapsing points of non-manifold edges.

Self Intersections

Shows surfaces which have intersections within the surface or belong to one solid. You can fix them in this tool by:

  • Optimizing CAD with or without re-faceting
  • Performing batch repair
  • Splitting surfaces
  • Deleting surfaces. Afterwards, you are left with free edges, which you can repair using the Free edges check.
Note: For FE Topology/tessellated models, deleting surfaces is the only supported option.

For complicated models, removing self-intersections and recreating the surfaces is not easy. With these new features, you can clean up using geometric or fix tolerance and ease the cleaning process.

Note: You can isolate these surface and manually trim the regions with self-intersections using the Split tools.

Sliver Surfaces

Shows surfaces which have regions that are narrower than a defined threshold.

To define the threshold value, click on the guide bar. The default tolerance is based on the geometric tolerance defined in the Preferences dialog. You can reduce the value in this tool if you wish to retain some valid sliver surfaces.

You can fix slivers by collapsing the edges or suppressing the edges. If Suppress Only is turned on, it will provide you the option to suppress individual edges of sliver surfaces. Upon submitting, it will suppress all sliver surface edges which are below a 60 degree angle. The rest of the edges you need to manually suppress.

For CAD geometry, you can also perform batch repair to auto-suppress edges based on given tolerance.


Duplicate surfaces overlapping each other and connected with green edges can be deleted.

Closed Shells

Shows the surfaces which are closed but do not form solids. You can construct solids out of these surfaces.

Toggle options for detecting baffles and considering solid surfaces.