The model shows that some of the stone walls are ‘ruined.’ That is, there are portions in which there are missing stones. In these places, the wall should appear fractured. In the original model, these places were modeled with very simple topology. For the new model, I want to show more detail.
The technique that I have decided to use is to add more vertices on the faces of the fractures by using Blender’s Subdivide Multi Fractal function. In order to avoid affecting the geometry of other portions of the wall, I am first adding an edge loop around the section. This isolates the rest of the wall from the addition of more vertices on the interior faces.