1.With the Mesh tool active, select the Mesh.
2.Draw a closed polygon that falls entirely within the Mesh polygon.
The New Mesh Points dialog box then opens.
3.Choose the “Create Hole” radio button.
4.Choose an option from the drop-down menu to define the relationship between the newly created points and existing ones.
•No Surface Fitting: the slopes of the mesh will be connected to the bottom elevation of the mesh.
•Fit to User Ridges or Fit to All Ridges: With these options, no slopes will be connected to the bottom of the mesh, allowing you to place your building exactly into the excavated site.
