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`+`K`	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

 Assumes the latest OptiFine & Minecraft versions.
 Updated to commit 83d482c3.
 Open source at https://gitlab.com/whoatemybutter/optifinedocs.