Head
data class HeadTarget(val type: String = "viewer", val uuid: String? = null, val name: String? = null, val key: String? = null, val script: String? = null, val refresh: Int = 20)(source)
头像目标：当前观看者、固定玩家、布局变量，或返回 Player/UUID/玩家名/null 的 Kether。 Head target: viewer, fixed player, layout variable, or Kether returning a Player/UUID/name/null.
Parameters
type
viewer、player、variable 或 kether。 / viewer, player, variable or kether.
uuid
固定玩家 UUID；不能同时填写 name。 / Fixed UUID, mutually exclusive with name.
name
固定玩家名；在线玩家优先使用其服务器档案。 / Fixed player name, preferring an online server profile.
key
要读取的布局变量名。 / Layout variable key to read.
script
动态目标 Kether，不会在渲染线程等待 Future。 / Dynamic-target Kether, never waited on by the renderer.
refresh
动态目标两次完成后求值之间的 tick 数，必须为正。 / Positive tick interval between completed dynamic-target evaluations.