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Modifying Grid Point Distribution for a Connector Based on Surface Curvature

Modifying the grid point distribution on connectors is generally needed when the underlying database surface is highly curved. The resulting modification will cluster the existing grid points towards the more curved sections of the surface. Consequently, the grid points on the least curved sections of the surface will be spread out.

Note that the numbers in the following steps apply to the example database; you will need to find out what dimensions best work for your geometry.

Example of a highly curved database surface Domain created on a highly curved database surface using default spacing

With a connector average spacing of 0.5 set in the Defaults tab, the domain to the right was created automatically by selecting the database surface and clicking on Domains on Database Entities on the toolbar. However, the resulting grid point distribution created by using the connector spacing default is constant and not based on the surface curvature.

Maximum Angle

Grid point clustering by angular deviation

Modifying existing grid point distribution for connectors can improve the distribution around highly curved sections of the database surface and remove unnecessary triangles on the surface mesh. Follow these steps that make use of a Maximum Angle setting for the distribution of the connectors' grid points.

  1. Select the connectors.
  2. Grid, Distribute
  3. Functions
  4. Check Shape Distribution Parameters to expand the shape distribution settings.
  5. Enter 65.0 for Max. Angle.
  6. Apply

The distribution around the curves looks much better and the number of triangles needed was reduced dramatically. You can see the areas in particular that benefited from the Maximum Angle setting.

Maximum Deviation

Points added to connectors by using a maximum deviation setting

To see how modifying grid points by setting the Maximum Deviation can improve the connectors' curvature, follow these steps.

  1. In the Function frame, click on Apply Equal Spacing.
  2. Apply
  3. You now have connectors with the original equal spacing dimensions and the text field for Max. Angle has been reset.

  4. Enter 0.3 for Max. Deviation.
  5. Apply
  6. Click on OK to exit the Grid, Distribute panel.

The domain has still improved from the original domain created with only the connector spacing default. But notice the areas below where the domain has changed in a different way by having the Maximum Deviation setting versus before when the Maximum Angle was set.

So whether you use Max. Angle or Max. Deviation to modify connector grid point distribution depends on the database surface. As a suggestion, test the use of both settings at different times to see what works for every unique surface.

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If you have questions about the steps outlined above or on any other meshing topic, please contact us via one of the following methods.

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