How do I change grass blocks within a set region to magma blocks? [duplicate]

I'm wanting to change grass to magma on my Bedrock Edition, Nintendo Switch world to make a Skyblock challenge sort of thing but so far every command I've tried just says "invalid command". Does anyone here know what I should be doing differently?

PS The range is from x256 z256 to x-256 z-256 if that changes anything.

minecraft-commands minecraft-bedrock-edition

Best Answer

Use the fill command.

/fill x1 y1 z1 x2 y2 z2 magma 0 replace grass

When using the fill command, there is a limit of 32,768 blocks, so you will need to use multiple fill commands. If the fill volume is 1 block high, using the following coordinates in 9 commands should work (where y is the y-coordinate):

-256 y -256 -76 y -76
-256 y -75 -76 y 104
-256 y 106 -76 y 256
-75 y -256 105 y -76
-75 y -75 105 y 104
-75 y 106 105 y 256
106 y -256 256 y -76
106 y -75 256 y 104
106 y 106 256 y 256

If the fill volume is more than 1 block high, you will need to divide it into even more fill commands. 181² is 32,761, so dividing an area into 181 × 181 squares will work. If you have an even larger volume, 32³ is 32,768.

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How do you replace a block in a certain area in Minecraft?

In Minecraft, you can use the /fill command to replace a specific type of block with another. In this case, we want to replace all water blocks with air blocks within a fill range.

How do you replace grass with other blocks in Minecraft?

The command is a run off of the /fill command. You would type /fill (x)(y)(z)(x)(y)(z) quartz_block 1 replace grass .

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