Custom Entity Models


A scary shark (source).

File location

/assets/minecraft/optifine/cem/**/*.jem /assets/minecraft/optifine/cem/**/*.jpm

Custom Entity Models (CEM) can completely change how an entity appears, animates, and moves.

The file format for CEM are JSON with the extensions .jem and .jpm.

Model files (.jem) contain a list of entity part models, which may be loaded inline or from a file .jpm file. These model files define a texture, and a list of submodels. These submodels define what part of an entity they attach to, how they attach, their animations, and more.


Button and tooltip for the option, found in Video Settings ‣ Quality.

Assumes latest OptiFine version.
Updated to commit 8ed2130d.