Desktop platform icon This functionality is currently available only on Onshape's browser platform.

Visualize the curvature combs on a sketch or part in a Part Studio.

StepsCopy link

Shortcut: Shift+c

When in sketch mode, or while editing a sketch, you can use the shortcut Shift+c to automatically select all curves and open the Show curvature dialog. Shift+c acts as a toggle: turning show curvature on and off while selections persist.

The Curvature visualization tool remains open even after exiting out of the sketch, however, the selection fields are not active. You can add more selections, or remove selections as long as the tool is open. Any changes to selections persist for the next time you invoke the tool. If you make a pre-selection before opening the tool, the tool opens with just that selection, clearing any other selections made previously.

To select one or more sketch curves or part edges:

  1. Open the context menu (RMB-click) and select Show curvature.

    Show curvature dialog

  2. Use the slider at the bottom of the dialog to adjust the magnitude of the combs, use the check boxes to choose whether or not to show curvature combs, inflection points, minimum radius, U curves, V curves, and to have the combs extend across the face.

    Curvature dialog with all boxes checked example

    Example of what a sketch curve looks like with Show curvature combs, and Show minimum radius all selected in the dialog box. When sketch inflection points are present, they appear as black 'bow ties'.

    Example of only Show curvature combs box checked in Show curvature dialog

    Image example of what a sketch curve looks like with only Show curvature combs selected in the dialog box.

  3. Click and drag a curve to adjust the curvature, if necessary. The combs update dynamically while you drag.

  4. To visualize U-curves and/or V-curves, select either or both of those check boxes, for example:

    Example of show curvature with the Show V curves selected

  5. Optional.  Increase or decrease the number of U or V curves from 2 to 64. The default is 8 for each.

  6. When finished, close the Curvature dialog; click X icon.

With the slider towards left of center:

Show curvature comb size slider shown to the left of center

With the slider closer to center:

Show curvature comb size slider shown to the right of center

Showing curvature during feature creationCopy link

You can also show the curvature combs for a feature in-process, for example, during an extrude:

  1. With the feature dialog open, right-click in the graphics area and select Show curvature to open the Show curvature dialog:

    Show curvature dialog

  2. Select a curve for the feature:

    Show Curvature with Previewed edges and faces enabled

  3. You can show the curvature for the selected edge used to create the new feature (uncheck Show for previewed edges), or select Show for previewed edges to see the curvature combs for the edge of the new feature being created:

    Show Curvature with Previewed edges and faces disabled

You can also show curvature combs, inflection points, and the minimum radius by selecting the boxes to the left of those options in the Show curvature dialog box, shown below:

Show curvature example with Show for previewed edges, Show curvature combs, Show inflection points, and Show minimum radius enabled

Example of a feature with Show for previewed edges, Show curvature combs, Show inflection points, and Show minimum radius selected in the Show curvature dialog box.