Form No-Contour Area
This option is an easy way to form a no-contour area. Follow these steps:
1. Form triangles
2. Display the triangles on the screen by using the Layers button to make them visible.
3. Use the Delete Triangles option to delete the triangles which you want to be free of triangles.
4. Use the Form No-Contour option and click in the area where of the deleted triangles.
5. You can optionally select the layer onto which the no-contour string will be inserted.
When you next re-form the triangles, the no-contour area will be excluded from triangulation and hence from contouring.