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 latest OptiFine version.
 Updated to commit 8ed2130d.
 Open source at https://gitlab.com/whoatemybutter/optifinedocs.