Is your selection a lot bigger than that?
Can you upload the file so that we can take a look?
Note: those selection filters are not specific to SubD objects.
At any rate, I would recommend using the Faces filter when deleting parts of meshes this way. I find that the mesh “gets weird” when you select edges, faces, and vertices. That seems to collapse the edges of a border and creates a single NGON around the new edge:
Strange, the mesh I have is 1M polygons, so less than yours.
I did select from top left to bottom right, maybe that affected something?
Ugg… I did that selection now just to chech, with the scan as a linked file (block) and now Rhino just froze. I don’t know if it tries to select the faces of the block as a bug?
VisualArq was loaded just now too. I’ll check to see if that affects anything.
(32GB memory)
Rhino crashed:
Other than the referenced file the Rhino file is very light. Just some curves and some boxes as we are designing an outdoor stair
And yeah, it’s extra fun working on classy projects in the local area. We have had the pleasure of designing other outdoor elements for that house too.