Constraining Vertices

This task shows you how to add or remove constraints for a selection of vertices.

• Open the Sample06.CATAnalysis document from the samples directory.

• Enter the Surface Mesher workshop.
  For more details, refer to Entering the Surface Mesher Workshop.

For a better visualization of constrained vertices, you can change the color of the part.
To do this:

• Right-click Surface.1 (under Links Manager.1 -> Part1 -> Geometrical Set.1) in the specification tree.
• Select the Properties contextual menu.
• Select the desired Fill Color in the Graphic tab.
• Click OK in the Properties dialog box.

1. Click Add/Remove Constraints on Vertex in the Local Specifications toolbar.

   The Vertex Constraint dialog box appears: Support: lets you select the vertices on which you want to add or remove constraints. Multi-selection of vertices is available. Mode: lets you specify if you want to add or remove constraints on the selected vertices. Constrained: lets you add constraints on the selected vertices. Unconstrained: lets you remove constraints on the selected vertices.

2. Select one or several constrained vertices as Support.

   In this particular example, select a yellow-highlighted vertex as shown below:

3. Select Unconstrained as Mode option in the Vertex Constraint dialog box.

4. Click OK.

   The unconstrained vertex is not yellow-highlighted anymore. A Constrain Vertex.1 object belonging to Geometry Specifications.1 appears in the specification tree under the Surface Mesh.1 mesh part.

5. Click Add/Remove Constraints on Vertex in the Local Specifications toolbar.

   The Vertex Constraint dialog box appears. Note that the vertex you selected in the second step is now blue-highlighted:

6. Select one or several unconstrained vertices as Support.

   In this particular example, select a blue-highlighted vertex as shown below:

7. Select Constrained as Mode option in the Vertex Constraint dialog box.

8. Click OK.

   The vertex is now yellow-highlighted: A Constrain Vertex.2 object belonging to Geometry Specifications.1 appears in the specification tree under the Surface Mesh.1 mesh part.