How to analyze the the number of holes by using Ovito?

Hello, I’m new in this forum. I have a question about Ovito. I did a simulation with Lammps and I want to
analyze the the number of holes. Here’s the image I’m hoping to get。
1711714885663

Hello, I recommend checking out the chapter on the Construct Surface Mesh Modifier in the OVITO manual. The section “Identification of volumetric regions” should serve as a good resource to get you started.
https://www.ovito.org/docs/current/reference/pipelines/modifiers/construct_surface_mesh.html#

Does this require the OVITO pro version?

Yes, some advanced features of the Construct Surface Mesh modifier are not available in OVITO Basic. Features exclusive to the OVITO Pro program version are clearly marked in the online manual. Kindly refer to this resource for details.