When selecting a vertex, Blender will highlight the connected edges, fading towards the connected vertices. If there is one direction the vertex is not highlighting, it is most likely because there are two vertices sitting on top of each that are not directly connected. It looks like this: H...
In this beginner-level Blender tutorial, learn how to model a low-polygon Jack-O-Lantern pumpkin! Blender 2.8 or a higher version is all you need, no external add-ons are used in this workflow.
For Tessellation purpose I try to make square quads so that tessellation does not have a zigzag stretch problem. For this, I export the meshto Blender. I add an edge loop inside the rectangular quad and import it back to Rhino. I use a custom Rhino command button for this. ! -_...