[1.16.x] Creating an item that powers redstone stuff without overriding blocks

[NorthWestWind]

I want to make an item that when the user holds it, it powers a redstone wire or piston under the player (which means 2 blocks under).

Here is my approach in LivingUpdateEvent when the player have the item:

    Vector3d pos = entity.getPositionVec();
    BlockPos blockPos = new BlockPos(pos);
    BlockState state = entity.world.getBlockState(blockPos);
    BlockState understate = entity.world.getBlockState(blockPos.down());
    if (state.func_235901_b_(BlockStateProperties.POWERED)) entity.world.setBlockState(blockPos, state.with(BlockStateProperties.POWERED, true), 3);
    if (understate.func_235901_b_(BlockStateProperties.POWERED)) entity.world.setBlockState(blockPos, understate.with(BlockStateProperties.POWERED, true), 3);
    if (state.func_235901_b_(BlockStateProperties.POWER_0_15)) entity.world.setBlockState(blockPos, state.with(BlockStateProperties.POWER_0_15, 15), 3);
    if (understate.func_235901_b_(BlockStateProperties.POWER_0_15)) entity.world.setBlockState(blockPos, understate.with(BlockStateProperties.POWER_0_15, 15), 3);
    if (state.func_235901_b_(BlockStateProperties.LIT)) entity.world.setBlockState(blockPos, state.with(BlockStateProperties.LIT, true), 3);
    if (understate.func_235901_b_(BlockStateProperties.LIT)) entity.world.setBlockState(blockPos, understate.with(BlockStateProperties.LIT, true), 3);
    if (state.func_235901_b_(BlockStateProperties.EXTENDED)) entity.world.setBlockState(blockPos, state.with(BlockStateProperties.EXTENDED, true), 3);
    if (understate.func_235901_b_(BlockStateProperties.EXTENDED)) entity.world.setBlockState(blockPos, understate.with(BlockStateProperties.EXTENDED, true), 3);

And it is just very buggy.

[Draco18s]

1 hour ago, NorthWestWind said:

And it is just very buggy.

Yes, because the power is coming from nowhere. As soon as you change the blockstate the game makes all the adjacent blocks check whether they should still be powered (etc) and find that no, they shouldn't be, and then the block you fiddled with sees that one of the other blocks updated its state to not be powered and turns off again.

 

Realistically you'll never get this to work the way you want it to.

[NorthWestWind]

Well that's bad.

 

Now that I think about it, maybe I should add a block that constantly emit redstone signal when the player is having the item near it.

Would it work?

 

[kiou.23]

4 hours ago, NorthWestWind said:

Well that's bad.

 

Now that I think about it, maybe I should add a block that constantly emit redstone signal when the player is having the item near it.

Would it work?

 

you could have an invisible and uncolidable block that's placed on the players feet whenever they're holding the item, I think this is asolve to the original problem.

[Draco18s]

On 2/6/2021 at 12:01 AM, kiou.23 said:

you could have an invisible and uncolidable block that's placed on the players feet whenever they're holding the item, I think this is asolve to the original problem.

Except for all the situations where that space isn't air.
Oh and wouldn't supply power in the desired location.

Edited February 7, 2021 by Draco18s