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 it’s own.

Keys

Result

F3 + V

Load all visible chunks

F3 + O

Open shader options

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


🆚️ This documentation assumes the latest OptiFine version. Notes are not made for legacy versions (1.8).
🔙️ This documentation is updated to commit 8410499f.
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