[1.14.4] How would I go about checking if a living entity is above my custom block

[iGuess19]

I'm currently trying to make a block that gradually increases the players y position (levitation) but only while the player is above block. I've looked into onEntityWalk but is only called if the player is directly on the block. I've looked into how soul sand does it with bubble columns but I'd rather not replace all air blocks above the block and instead just use livingEntity.getMotion(). I'm not sure what method I should use so that there are continuous checks to see if a living entity is above the block.

 

Any help is appreciated thanks.

[Animefan8888]

7 hours ago, iGuess19 said:

Any help is appreciated thanks.

You'd have to subscribe to the LivingUpdateEvent and check all blocks beneath the entity.

Use the suggestion below me it's more efficient.

Edited August 16, 2019 by Animefan8888

[DavidM]

Or your could create a tile entity that pushes living entities above it every tick.

[iGuess19]

Hey guys, just wanted to give a bit of an update as well as say that I appreciate both of your help.

 

I spent the last couple of days messing with the LivingUpdateEvent to no avail. I was having issues making it so that the player would continue to levitate even if it was more than one block above the levitation block.

 

I saw DavidM's reply and I spent a few hours today messing around with tile entities and just generally trying to get familiar with what I may need and I got it to work! I have a quick question about tile entities and performance though. Since I started playing MC I have always heard that tile entities are lag machines after a certain point. Since my tile entity relies on "tick updates" (may not be proper term) should I be worried about performance? I plan to implement a block for each potion effect so I could see users potentially using many these blocks to make, say, healing rooms with a bunch of regen blocks, or long highways with speed blocks, etc.

 

I also have another question, I'm not sure If I should make a separate post for this but how would I go about stopping the effect once it reaches a non air block above? That way it won't work through ceilings in builds. Right now I'm using a for loop to check from one above the tile entities y position up until world height but that seems disastrous. Is there some kind of ray I could use to check if it hits a solid block? Sorry if these questions seem simple I'm still getting used to the forge api and minecrafts internals.

 

Also, thanks again to both of you. I now have a working block as well as knowing about forge events that may be useful later on.

Edited August 19, 2019 by iGuess19

[DavidM]

I can't figure out how to quote on mobile so this post may be a formatting mess.

 

Tile entities do create a bigger performance impact than regular blocks, but not significant enough to worry about. Yes, ticking the TEs every tick will lag a bit if you have tenth of thousands of it, but a roomful probably won't cause problems.

 

As for checking for blocks above the block, your way of using a for loop to check should be the best way. Ray tracing is way more expensive than a for loop.

[Animefan8888]

5 hours ago, DavidM said:

I can't figure out how to quote on mobile so this post may be a formatting mess.

It's a bit of a pain, but you should just be able to highlight and hopefully the "Quote Selection" box will come up.

5 hours ago, iGuess19 said:

Right now I'm using a for loop to check from one above the tile entities y position up until world height but that seems disastrous.

I would probably just give the block an arbitrary range maybe make it increase-able. And only for loop for that range until I find a solid block. Otherwise you just have to go until you reach a solid block. Then I would take that range I have found (the y height of the solid block) and use World#getEntitiesInAABB (Or whatever it is called now).