Surfaces aren’t recognized as surfaces and are listed as Breps.
I recently discovered that the box properties component can be used to get a bounding box center and it seemed to be much faster compared to calculating the volume, especially on complex objects.
Unfortunately his does not work with a Brep listed in the Query Model Objects component.
query_model_objects_geometry.gh (16.3 KB)
geometry.3dm (160.8 KB)
Is Query Model Objects new in Rhino 8? If so, you may have discovered a shortcoming that can be fixed by the development team.
Note that a Surface is only a Surface if it has no trims. Otherwise it is a Brep, even if it is only a single surface, not a polysurface. I can’t open your 3dm file in Rhino 7 so I can’t check what is in there. If you draw just a simple plane, it should show up as Surface I think.
Rhino 8, and yes it’s a surface 
Better let @dale or someone else know that surfaces are not showing up in the new grasshopper component.
@AndyPayne - can you have a look at this?
This should be fixed in the next available WIP.
