Minecraft wiki entry for Resource_Pack, associated text: Textures from assets/minecraft/textures/entity/villager and assets/minecraft/textures/entity/zombie_villager support a .mcmeta file in JSON format containing additional effects to apply to the hat layer. The file is contained in the same directory as the texture, and has the same name as the texture, except appended with .mcmeta. For example, the file profession/farmer.png can have a properties file called profession/farmer.png.mcmeta