First of all, I'm new to this site as well as all CAD programs. I work as a survey engineer and have a rather complicated tunnel geometry on my current project, as well as a small issue when it comes to mass calculation.

This is what I've got.
- A prescan of the existing tunnel geometry.
- A theoretical moddel of what i should become.
- A mass type which is prescan +Xm offset
- A mass type of everything between prescan +Xm offset and the theoretical moddel.

Since the existing tunnel is shaped like a fork, i really need help to find a softwear that can expand a mesh/solid/point cloud in 3D/XYZ.

Do you have any suggestions?