Want an unusual and impossible looking wall? Here's a method to make this:
1) First create a line of alternating dirt and sand on the ground like this:
Make sure that it's as long as you want the wall to be. After it's complete you won't be able to lengthen it without destroying the whole thing and starting from scratch!
2) Place two cacti blocks on each sand block. Just two.
3) Place a leaf block on top of each cactus to stop it from being able to grow.
4) Plant a pine sapling on each dirt block. Use bonemeal on first sapling until it grows.
5) After the tree grows destroy every single block of it except for the two wood blocks adjacent to the cacti. You have to do this in order to give the next sapling room to grow. Make sure not to harm the player placed leaf blocks above the cacti!
6) Use bonemeal on the next sapling. Repeat steps 5&6 until every sapling is grown and sheared down to 2 log blocks.
7) You now have a wall consisting of 2 log blocks next to 2 cactus blocks with a leaf block on top. If you want a taller wall you can stack another layer on top like this:
The dirt blocks aren't mandatory by the way. After the tree grows you can replace them with whatever material you want. You can also get rid of the wood blocks not touching the cacti. The only thing you can't change are blocks directly touching a cactus.
Caring For Your Cactus Wall
Your cactus wall is defying the laws of Minecraft physics every moment of its existence. It's important not to change any block next to the cacti or it will cause a block update, make the game notice the cactus should not be there, and cause it to break.
A block update will only be triggered if you change a space directly touching a cactus block horizontally or vertically. It doesn't register changes diagonally. So you can place things on top, on, or next to the logs and the leaf block. Just make sure nothing changes next to a cactus block or it'll break, and you won't be able to fix the hole without demolishing the entire wall and rebuilding from scratch.
Nice find man! Possibly the best anti-grief wall for MP?
Probably not. This wall is actually very easy to grief since destroying any block in it or placing any block next to it can destroy the cacti.
And the cacti can't be replaced unless you chop the trees next to its spot down first. And you can't chop down a tree without destroying the cacti on the other side of it too. So to replace any one cactus you have to demolish and rebuild the entire wall. So I would not use this anywhere that griefers can operate.
It's main purpose is to just look cool, and leave people wondering how you did it.
I'm assuming you're only doing two cactus because you expect the tree will place leaves where the 3rd cactus block would be? However, if that doesn't happen wouldn't the cactus trying to grow a 3rd block cause an update and then the cactus would pop out? Trying to fix that would cause you to have to redo the whole wall. Seems like it would be best to start with 3 cactus blocks instead of 2.
I'm assuming you're only doing two cactus because you expect the tree will place leaves where the 3rd cactus block would be? However, if that doesn't happen wouldn't the cactus trying to grow a 3rd block cause an update and then the cactus would pop out? Trying to fix that would cause you to have to redo the whole wall. Seems like it would be best to start with 3 cactus blocks instead of 2.
I'm pretty sure that you need an air space above where the cacti would grow in order for it to grow. Sort of like wheat, melons, and pumpkins.
I'm pretty sure that you need an air space above where the cacti would grow in order for it to grow. Sort of like wheat, melons, and pumpkins.
I just popped up a flat world to try this out and it does work, takes quite a bit of bonemeal at times though, and they appear to pop out eventually for me.
Hey, I updated the first post with pictures and a step by step guide.
I also figured out a good method for preventing cactus growth: placing a leaf block on top of each cactus. Since it's player placed it'll never decay. Another block, even a glass block, on top of the cacti prevents the sapling from being able to grow but a leaf block allows it.
I added this glitch to my redstone creations thread. Although you don't need redstone to build it, you can use redstone to make the cacti collapse without using a piston to push a block next to it. Just power or depower the sand from below and the cactus will break. Might be a cool way of building a cactus barrier that explodes out of your way in a challenge map.
You can use this to tell if someone has gone through the wall, they can't hide the fact they entered without rebuilding it. Hopefully endermen won't steal parts of it.
1) First create a line of alternating dirt and sand on the ground like this:
Make sure that it's as long as you want the wall to be. After it's complete you won't be able to lengthen it without destroying the whole thing and starting from scratch!
2) Place two cacti blocks on each sand block. Just two.
3) Place a leaf block on top of each cactus to stop it from being able to grow.
4) Plant a pine sapling on each dirt block. Use bonemeal on first sapling until it grows.
5) After the tree grows destroy every single block of it except for the two wood blocks adjacent to the cacti. You have to do this in order to give the next sapling room to grow. Make sure not to harm the player placed leaf blocks above the cacti!
6) Use bonemeal on the next sapling. Repeat steps 5&6 until every sapling is grown and sheared down to 2 log blocks.
7) You now have a wall consisting of 2 log blocks next to 2 cactus blocks with a leaf block on top. If you want a taller wall you can stack another layer on top like this:
The dirt blocks aren't mandatory by the way. After the tree grows you can replace them with whatever material you want. You can also get rid of the wood blocks not touching the cacti. The only thing you can't change are blocks directly touching a cactus.
Caring For Your Cactus Wall
Your cactus wall is defying the laws of Minecraft physics every moment of its existence. It's important not to change any block next to the cacti or it will cause a block update, make the game notice the cactus should not be there, and cause it to break.
A block update will only be triggered if you change a space directly touching a cactus block horizontally or vertically. It doesn't register changes diagonally. So you can place things on top, on, or next to the logs and the leaf block. Just make sure nothing changes next to a cactus block or it'll break, and you won't be able to fix the hole without demolishing the entire wall and rebuilding from scratch.
Some people don't like to use mods or play multiplayer only :3.
Sweet find!
Probably not. This wall is actually very easy to grief since destroying any block in it or placing any block next to it can destroy the cacti.
And the cacti can't be replaced unless you chop the trees next to its spot down first. And you can't chop down a tree without destroying the cacti on the other side of it too. So to replace any one cactus you have to demolish and rebuild the entire wall. So I would not use this anywhere that griefers can operate.
It's main purpose is to just look cool, and leave people wondering how you did it.
I'm assuming you're only doing two cactus because you expect the tree will place leaves where the 3rd cactus block would be? However, if that doesn't happen wouldn't the cactus trying to grow a 3rd block cause an update and then the cactus would pop out? Trying to fix that would cause you to have to redo the whole wall. Seems like it would be best to start with 3 cactus blocks instead of 2.
by c0yote
I tried it with terrible results. I gave my wife my glasses for a second, a creeper showed up and now my wife is pregnant.
Stupid 3D..
I'm pretty sure that you need an air space above where the cacti would grow in order for it to grow. Sort of like wheat, melons, and pumpkins.
I just popped up a flat world to try this out and it does work, takes quite a bit of bonemeal at times though, and they appear to pop out eventually for me.
Exactly my point. If the tree grows and leaves an airspace above the cactus, you're in for trouble.
by c0yote
I tried it with terrible results. I gave my wife my glasses for a second, a creeper showed up and now my wife is pregnant.
Stupid 3D..
I also figured out a good method for preventing cactus growth: placing a leaf block on top of each cactus. Since it's player placed it'll never decay. Another block, even a glass block, on top of the cacti prevents the sapling from being able to grow but a leaf block allows it.
Cactus mod? Link please.
Check out my epic Request!
Glad you like it! If you want to see some other easy-to-make inventions of mine I have a pretty long list in the inventorium link in my signature.
Because it's true.
Playing Minecraft since [Friday, March 19, 2010, 9:20:21 PM] (First indev world save)
+1 well earned
This thread bores me.