Create a Hole in the Mesh

1.Select the existing Mesh.

2.With the Mesh tool, draw a closed polygon that falls entirely within the Mesh polygon.

3.The New Mesh Points dialog box opens.

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-25/040_elementsvb/CreateHole.png 

4.Choose the “Create Hole” radio button.

5.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.

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-25/040_elementsvb/MeshSurfaceNoFit3DHole.PNG 

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.

https://helpcenter.graphisoft.com/wp-content/uploads/archicad-25/040_elementsvb/MeshFitHole3D.PNG 

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