Rip Vertices and Extend

Reference

Mode:

Edit Mode

Menu:

Vertex ‣ Rip Vertices and Extend

단축키(hotkey):

Alt-D

This tool takes any number of selected vertices and duplicate-drags them along the closest edge to the mouse. When extending an edge loop, it extends the vertices at the endpoints of the loop. The behavior is similar to the Extrude tool, but it creates an n-gon.

It helps to easily add details to existing edges.