How to delete part of the dense model

[marilou]

I would like to delete part of the model .
How is possible to do it? And in which part of the process? When I align photos? When I build made dense cloud? Mesh? Texture?

[pbourke]

Standard way to delete dense point cloud is using the tools as shown in the attached.
Common pipeline is to clean dense cloud before meshing.

[Alexey Pasumansky]

As an addition to the said above, note that you can limit the area of dense cloud and mesh reconstruction by resizing the bounding box (region) after the camera alignment is finished.