Weird sharp vertices with subdivision modifier I have a simple skull model, to which I applied the subdivision modifier. For the most part everything works as expected, except I keep getting these weird sharp vertices and I can't seem to figure out how to flatten them.



I'm using Blender 2.8. Is this some kind of feature I can disable/enable for particular vertices? The distance between the sharp vertices and the gray outline differ.



Any suggestions please? Thank you!

EDIT: I also tried selecting as both - vertexes and edges and then applied Edge->Clear Sharp, but nothing changed.
This is typical of inverted normals.

To fix it, go in edit mode, select all the vertices and use ShiftN to recalculate normals.