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I've been working on an "infinite elytra flight" thingy and came across into an issue. I want to make the player goes up when reaching a certain distance from the ground.

I know I can use the command

/testfor @p [x=coord y=coord z=coord]

This command can /testfor a player's y coordinates, but how to detect his/her relative altitude from the ground?

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  • Why downvote, please explain so I can improve it. – stevefestl Jun 9 '17 at 11:36
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    You're unlikely to get an answer as to why your question was downvoted, but on the whole, I think it's a good question. I typically recommend against the use of testfor, but it might be useful here. – MBraedley Jun 9 '17 at 11:58
  • Have you made any attempt to solve this yourself? Arqade works better when askers show effort to solve their own problems; we see that you have a problem you've worked on, and answerers respond to that. You also get a more specific answer that's tailored exactly to the part you're stuck, and Arqade gets a very specific question. Everybody wins! – Frank Jun 9 '17 at 12:04
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NOTE: I am not 100% familiar with Minecraft commands, but I may have found a way according to the wiki.

You can use the /testforblock command to check whether a certain block is in a certain location. This command can be run using the Tilde notation (~3, for example), to get a relative location towards the command execution. You can then prefix that with the /execute command to execute it at a player's location.

Another thing you can do is instead of using coordinates is specifying a radius using [r=R].

putting those together, you can do one of 2 things:

  1. find a player and test if any of the common "top layer blocks" like sand, gravel, stone, dirt or grass blocks are within X blocks on the Y Axis. If the command is true, teleport the detected player upwards..

  2. for every top block in the infinite elytra area, select all players that are within a certain range and teleport them upwards.

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  • I don't think you can use the [r=R] selector like this. That changes which entity gets selected, but with testforblock, you not dealing with an entity. – MBraedley Jun 10 '17 at 1:52

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