How to /testforblock in the overworld from the nether

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25-09-2024

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Commanding the Nether: How to Test for Blocks in the Overworld from the Nether

Do you want to build elaborate contraptions in Minecraft that bridge the gap between dimensions? Perhaps you're creating a Redstone contraption that activates based on a block placement in the Overworld, all from the comfort of your Nether fortress. While it might sound impossible, with the right command, you can achieve this!

Here's how to use the /testforblock command to check for specific blocks in the Overworld from the Nether:

The Problem: The /testforblock command, when used in the Nether, only checks for blocks within the Nether itself. This creates a problem for anyone wanting to monitor the Overworld remotely.

The Solution: To overcome this limitation, we can use a combination of the /execute command and the @e selector to target entities in the Overworld. Here's a breakdown of the command:

/execute @e[type=armor_stand,x=0,y=0,z=0,dx=0,dy=0,dz=0,r=100,rm=0] ~ ~ ~ testforblock ~ ~ ~ minecraft:stone

Let's break it down:

• /execute: This command executes another command at a specific location or on a specific entity.
• @e[type=armor_stand,x=0,y=0,z=0,dx=0,dy=0,dz=0,r=100,rm=0]: This selects an armor stand located in a specific area. The x, y, z, dx, dy, dz parameters define the coordinates of the area to search, while r and rm set the minimum and maximum radius of the area. You can adjust the values to encompass the desired location in the Overworld.
• ~ ~ ~: These are relative coordinates that define the location for the next command to be executed.
• testforblock ~ ~ ~ minecraft:stone: This executes the /testforblock command at the location defined by the previous coordinates, checking for a stone block.

Important Considerations:

• Armor Stand Placement: The armor stand in the Overworld is crucial for the command to work. You'll need to create an armor stand within the designated area you want to monitor.
• Coordinate Adjustments: Make sure to adjust the x, y, z, dx, dy, dz, r, and rm values to accurately target the desired location in the Overworld.
• Block Specifics: You can replace minecraft:stone with any desired block to test for.

Example: Let's say you want to know if a player has placed a chest at a specific location in the Overworld. You would:

1. Place an armor stand: In the Overworld, place an armor stand at the desired location.
2. Modify the command: Adjust the x, y, z, dx, dy, dz, r, and rm parameters in the command to target the location where your armor stand is placed.
3. Check the output: Execute the command in the Nether. If a chest is at the location, the command will return a success message.

Additional Notes:

• You can use this technique to trigger Redstone circuits or activate other commands in your Nether fortress based on the detection of specific blocks in the Overworld.
• This method works best when you have a clear line of sight between your armor stand in the Overworld and the area you are monitoring.

By leveraging these commands and a bit of creativity, you can bridge the gap between dimensions in Minecraft, turning your Nether base into a command center for your Overworld operations. Happy building!