本帖最后由 末地探险者 于 2020-4-3 21:42 编辑

  2. summon armor_stand 0.0 0.0 0.0 {Tags:["track_work"],Rotation:[0.0f,0.0f],NoGravity:true,Invisible:true,Marker:true}
  3. execute as @p anchored eyes at @p run summon arrow ^ ^ ^ {Motion:[0.0,0.0,0.0],NoGravity:true,pickup:false,Silent:true,damage:-1.0,Tags:["track_sel"]}
  4. execute as @e[tag=track_work] at @s rotated as @p anchored feet run tp ^ ^ ^10
  5. execute as @e[tag=track_sel] store result entity @s Motion[0] double 1 run data get entity @e[tag=track_work,limit=1] Pos[0]
  6. execute as @e[tag=track_sel] store result entity @s Motion[1] double 1 run data get entity @e[tag=track_work,limit=1] Pos[1]
  7. execute as @e[tag=track_sel] store result entity @s Motion[2] double 1 run data get entity @e[tag=track_work,limit=1] Pos[2]
  8. tellraw @a {"entity":"@e[tag=track_sel]","nbt":"Motion[0]"}
  9. kill @e[tag=track_work]
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照理来说本function生成的箭即是十字准星指向的位置
但是总有误差，不知道怎么分析误差来源（经测试，那个盔甲架y小于0照样工作！？，反正就是朝向地面也可以）

（已经看过https://www.mcbbs.net/thread-919112-1-1.html和https://www.mcbbs.net/thread-917613-1-1.html）
只是想要更简单的解决方案