A suite of retopology tools for Blender

Knife Help

Shortcut: Ctrl+5, Ctrl+K

Quick Shortcut: K

The Knife tool allows you to cut into the existing geometry similarly to Blender’s Knife tool.

Note: the Knife tool will only cut into existing geometry; it will not create new vertices, edges, or faces.

If nothing is selected, the first insert will

The subsequent insertions will cut in new edges, splitting faces and edges accordingly.

Note: an existing face will not be split until there are distinct entrance and exit vertices. Until the face can split, the created vertices and edges will be non-manifold (possibly detached) geometry.


Ctrl+LMB, Ctrl+LMB+Double : insert geometry connected to selected geometry
E : resets the knife starting point


LMB+Click, Shift+LMB+Click : select geometry
LMB+Drag, Shift+LMB+Drag : paint geometry selection
Ctrl+Shift+LMB+Click : select along shortest path
A : select / deselect all
Alt+A : deselect all


G : grab and move selected geometry
LMB+Drag : grab and move selected geometry under mouse
Shift+S : smooths edge flow of selected geometry


Backspace, Delete, X : delete/dissolve/collapse selected
V : rip selected edge
Alt+V : rip and fill selected edge