Debug Keys

Debug Keys are a feature of Vanilla Minecraft that perform various debugging functions when a specific key combination is pressed, usually involving the F3 button.

In addition to the Vanilla set of debug keys, OptiFine adds some of its own.

Keys

Result

F3+V

Load all visible chunks

F3+O

Open shader options

New in version M5.

F3+R

Reload shaders

Requires system property chunk.debug.keys

Keys

Result

F3+E

Show chunk path

F3+L

Smart cull

F3+U

Capture frustum

Alt+F3+U

Capture shadow frustum

Shift+F3+U

Release frustum

F3+V

Chunk visibility


Assumes the latest OptiFine version.
Updated to commit dc7b4aca.

Last update: 2024 March 13