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.



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



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 latest OptiFine version.
Updated to commit 8ed2130d.