I discovered a very odd feature (useful bug?) dispensers have today
Dispensers can be activated by any change in a redstone wire across a 1 block gap of empty air, if they are already receiving a continuous redstone signal from another source.
By any change I mean the wire either being turned on or off, or changing it's shape because you place or remove another piece of redstone dust next to it.
Here's an overhead view of the dispenser:
= dispenser
= redstone wire
= redstone torch
The redstone dust on the left is in a cross shape because it's by itself. If you add another piece of redstone dust like this it becomes a line and that shape change triggers the dispenser.
When you remove the second piece of dust and turn it back into a cross shape that will trigger the dispenser again. The shape change works whether or not those two pieces of wire are powered.
Another thing that triggers it the same way is a redstone signal going on or off in the wire. If you activate that piece of redstone wire, or deactivate it, the dispenser also triggers itself once. That allows you to make a lever that activates the dispenser once no matter which way you flip it. A button or pressure plate will activate it twice, once when you press it and once when it pops back out.
This works across gaps of empty air, even if the dispenser is floating above empty space. It also works through water (and maybe lava? haven't tested that yet). Here are the spaces the triggering wire can be:
Overhead View:
It also works vertically, both up and down. Here's a side view of acceptable vertical spots (dust is placed on the stone block):
Remember it only works if the dispenser is receiving continuous power from another source though.
Is this a newly found glitch? Old one I just never heard about? Either way, I can see a lot of uses for it.
Also found it works through solid blocks, and even through repeaters pointing the wrong way. Hmm...a way to send signals the other way through a repeater.
Also found it works through solid blocks, and even through repeaters pointing the wrong way. Hmm...a way to send signals the other way through a repeater.
but the repeater would be facing right into the dispenser in this situation, no?
The dispenser is triggered when you change the shape of the wire (whether it is powered or not) by placing or breaking another piece of wire next to it.
However the dispenser is not triggered when you place/break a block (or push/pull a block) to block the wire from going up/down a slope and change its shape.
The dispenser is triggered when you change the shape of the wire (whether it is powered or not) by placing or breaking another piece of wire next to it.
However the dispenser is not triggered when you place/break a block (or push/pull a block) to block the wire from going up/down a slope and change its shape.
This quirk got me interested, and I've done a little bit more testing, and I think I more or less understand the limitations to this bug. Basically, it seems that this bug doesn't only affect dispensers in a linear pattern. What I mean by that is, the dispenser doesn't need to be located like this from the redstone (shroom is redstone)
(top view)
but it can also be located like this
(top view)
From how I've tested it, the dispensers that are affected by that redstone must be located 1 space in any direction, and then from any direction in that space. For example, in the xample above, the dispenser is located 1 to the left, and then 1 up. Similarily, it can be located 1 left, 1 down, 2 left, 1 left 1 up (on z-axis), and 1 left 1 down (on z-axis). This rule seems to apply in every direction from the redstone as well.
Also, your rule about how the shape change of redstone wire affecting the dispensers is untrue from my testing. In fact, you've proven it wrong with what you've just said about how the dispensers don't fire if you attempt to change its shape by cutting off its connection with another piece of redstone wire. And its not just this scenario. If you attempt to change its shape by also placing or remove levers, pressure plates, etc, or if you change its shape by putting a block next to it with a redstone torch on top, it also won't activate the dispenser.
I believe that instead, the dispenser only gets activated when the redstone block itself is updated. This would explain why changing its shape by putting a lever next to it doesn't activate the redstone. I'm sure several people have seen the thread with the pressure plate removal detection, and as in the thread, the only way for the power to go through the wire after removing the plate is for you to send a new power through so that the block properly updates, which is why you need the clock.
This also explains why the dispenser activates when the redstone receives power; because the redstone power updates the block.
Anyways, I decided to use this bug to create a machine gun wall. The wiring on it is extremely compact, since it abuses this bug. The only thing the wiring is composed of is the toggle-able 1-clock (or maybe 2-clock, not sure) from grizdale's piston logic compendium, and a really long line of redstone wire (exactly 29 blocks to be exact), plus a ton of redstone torches put to activate all the dispensers.
The entire thing is composed of 93 dispensers, it can fire 930 arrows (or 465 if the clock counts as a 2-clock) a second, and in total, they can store 53 568 arrows (loading it up is painful). You can also easily make the wall a hell of a lot longer, but you would have to use repeaters, which would cause delay in some of the dispensers (I wanted them all to shoot at the same time). And here are the pics (not much to show)
Neat machine gun wall. And good find about it working diagonally. That's pretty useful info.
I've done a bit more testing and found that placing or removing another redstone wire next to the triggering redstone causes the device to activate. But changing the triggering dust's shape any other way doesn't work.
For example, putting a repeater next to the dust also changes its shape but doesn't trigger the bug. Neither does using a piston to move a block above dust on a slope to block that path. I guess the 2nd dust causes the triggering dust to update but other things don't, even though it does change the triggering dust's appearance.
So in short two things seem to activate it:
1) Placing or removing a 2nd redstone dust next to the triggering dust (whether the triggering dust is powered or not)
2) Powering or depowering the triggering dust (or a triggering redstone torch, that also works)
EDIT: Placing or removing redstone torch by itself also triggers the device from a distance, without a need for a second dust.
I guarantee you that I'm not trolling. This 100% works.
Get yourself a dispenser, a redstone torch, 2 pieces of redstone wire and try it out. It's super simple to make.
I believe he was talking about the bug itself, and not the reliability of your words. I mean, looking at all the posts, I'd say it's pretty obvious that the bug is confirmed. But if he really was calling you a troll, then he must be horribly ignorant.
Hm, I'm not sure what to actually call this kind of gate.
A jump gate? An air gate? A Regular Hexahedron gate :tongue.gif: ?
I can already think of a lot of uses for the bug. For one, transmission of signals through solid curtains of lava. It could also be used to make a really compact, minimal resources required, item degrade clock.
It could also be used to send a signal downward through a solid floor.
Hm, I'm not sure what to actually call this kind of gate.
A jump gate? An air gate? A Regular Hexahedron gate :tongue.gif: ?
I can already think of a lot of uses for the bug. For one, transmission of signals through solid curtains of lava. It could also be used to make a really compact, minimal resources required, item degrade clock.
It could also be used to send a signal downward through a solid floor.
or it could be used to make a simple machine gun wall :smile.gif:.
I also made a trap based off of it. It's actually an interesting trap. Basically what I have is redstone wire out in the open, with a lever above it. The lever is also connected to a door (presumably where supposed treasure lies). And also in plain sight, you can see the wire connect to a dispenser with arrows in them. Now of course, any player would see that and do one of two things. Empty the dispenser, or break the wire. Assuming they break the wire, they activate the hidden dispenser on the other side of the wall, which then shoots an item on to a pressure plates, and shuts the door the first door, locking them in for 5 minutes (which is when the item will disappear). The beauty of the trap is even if the person decides to empty the dispenser, without break the first redstone wire, turning the lever on will power the wire, and will still activate the dispenser.
The only way for it to truly be bypassed is if they destroy the redstone wire that's two blocks away from the dispenser first. But you could probably build a much more efficient trap with hard redstone wiring. None the less, it's just a concept.
It could also be used to send a signal downward through a solid floor.
Easy to send signals thru solid floor. Just ude this setup:
where is a block
is a redstonetorch
is a piston (pushing the log)
and is redstone.
Power is sent thru the top redstone transmitted to the piston, pushing the log onto the torch, powering the other redstone. ~Rodol
Easy to send signals thru solid floor. Just ude this setup:
where is a block
is a redstonetorch
is a piston (pushing the log)
and is redstone.
Power is sent thru the top redstone transmitted to the piston, pushing the log onto the torch, powering the other redstone. ~Rodol
This was back in 1.6, no pistons unfortunately.
Rollback Post to RevisionRollBack
Moomoomoo3O9, (Moomoomoo THREE O NINE, NOT ZERO!) Redstone Wirerer. I also make Dokucraft Textures!
Dispensers can be activated by any change in a redstone wire across a 1 block gap of empty air, if they are already receiving a continuous redstone signal from another source.
By any change I mean the wire either being turned on or off, or changing it's shape because you place or remove another piece of redstone dust next to it.
Here's an overhead view of the dispenser:
= dispenser
= redstone wire
= redstone torch
The redstone dust on the left is in a cross shape because it's by itself. If you add another piece of redstone dust like this it becomes a line and that shape change triggers the dispenser.
When you remove the second piece of dust and turn it back into a cross shape that will trigger the dispenser again. The shape change works whether or not those two pieces of wire are powered.
Another thing that triggers it the same way is a redstone signal going on or off in the wire. If you activate that piece of redstone wire, or deactivate it, the dispenser also triggers itself once. That allows you to make a lever that activates the dispenser once no matter which way you flip it. A button or pressure plate will activate it twice, once when you press it and once when it pops back out.
This works across gaps of empty air, even if the dispenser is floating above empty space. It also works through water (and maybe lava? haven't tested that yet). Here are the spaces the triggering wire can be:
Overhead View:
It also works vertically, both up and down. Here's a side view of acceptable vertical spots (dust is placed on the stone block):
Remember it only works if the dispenser is receiving continuous power from another source though.
Is this a newly found glitch? Old one I just never heard about? Either way, I can see a lot of uses for it.
but the repeater would be facing right into the dispenser in this situation, no?
Nope, it can be pointing away from the dispenser. It seems to register the change in the redstone wire 1 block away regardless of the obstacle.
Try building it. It'll take about 30 seconds and you'll see what I mean better than I can explain it. It's a very interesting quirk.
The dispenser is triggered when you change the shape of the wire (whether it is powered or not) by placing or breaking another piece of wire next to it.
However the dispenser is not triggered when you place/break a block (or push/pull a block) to block the wire from going up/down a slope and change its shape.
This quirk got me interested, and I've done a little bit more testing, and I think I more or less understand the limitations to this bug. Basically, it seems that this bug doesn't only affect dispensers in a linear pattern. What I mean by that is, the dispenser doesn't need to be located like this from the redstone (shroom is redstone)
(top view)
but it can also be located like this
(top view)
From how I've tested it, the dispensers that are affected by that redstone must be located 1 space in any direction, and then from any direction in that space. For example, in the xample above, the dispenser is located 1 to the left, and then 1 up. Similarily, it can be located 1 left, 1 down, 2 left, 1 left 1 up (on z-axis), and 1 left 1 down (on z-axis). This rule seems to apply in every direction from the redstone as well.
Also, your rule about how the shape change of redstone wire affecting the dispensers is untrue from my testing. In fact, you've proven it wrong with what you've just said about how the dispensers don't fire if you attempt to change its shape by cutting off its connection with another piece of redstone wire. And its not just this scenario. If you attempt to change its shape by also placing or remove levers, pressure plates, etc, or if you change its shape by putting a block next to it with a redstone torch on top, it also won't activate the dispenser.
I believe that instead, the dispenser only gets activated when the redstone block itself is updated. This would explain why changing its shape by putting a lever next to it doesn't activate the redstone. I'm sure several people have seen the thread with the pressure plate removal detection, and as in the thread, the only way for the power to go through the wire after removing the plate is for you to send a new power through so that the block properly updates, which is why you need the clock.
This also explains why the dispenser activates when the redstone receives power; because the redstone power updates the block.
Anyways, I decided to use this bug to create a machine gun wall. The wiring on it is extremely compact, since it abuses this bug. The only thing the wiring is composed of is the toggle-able 1-clock (or maybe 2-clock, not sure) from grizdale's piston logic compendium, and a really long line of redstone wire (exactly 29 blocks to be exact), plus a ton of redstone torches put to activate all the dispensers.
The entire thing is composed of 93 dispensers, it can fire 930 arrows (or 465 if the clock counts as a 2-clock) a second, and in total, they can store 53 568 arrows (loading it up is painful). You can also easily make the wall a hell of a lot longer, but you would have to use repeaters, which would cause delay in some of the dispensers (I wanted them all to shoot at the same time). And here are the pics (not much to show)
Nice find though!
I've done a bit more testing and found that placing or removing another redstone wire next to the triggering redstone causes the device to activate. But changing the triggering dust's shape any other way doesn't work.
For example, putting a repeater next to the dust also changes its shape but doesn't trigger the bug. Neither does using a piston to move a block above dust on a slope to block that path. I guess the 2nd dust causes the triggering dust to update but other things don't, even though it does change the triggering dust's appearance.
So in short two things seem to activate it:
1) Placing or removing a 2nd redstone dust next to the triggering dust (whether the triggering dust is powered or not)
2) Powering or depowering the triggering dust (or a triggering redstone torch, that also works)
EDIT: Placing or removing redstone torch by itself also triggers the device from a distance, without a need for a second dust.
I guarantee you that I'm not trolling. This 100% works.
Get yourself a dispenser, a redstone torch, 2 pieces of redstone wire and try it out. It's super simple to make.
I believe he was talking about the bug itself, and not the reliability of your words. I mean, looking at all the posts, I'd say it's pretty obvious that the bug is confirmed. But if he really was calling you a troll, then he must be horribly ignorant.
A jump gate? An air gate? A Regular Hexahedron gate :tongue.gif: ?
I can already think of a lot of uses for the bug. For one, transmission of signals through solid curtains of lava. It could also be used to make a really compact, minimal resources required, item degrade clock.
It could also be used to send a signal downward through a solid floor.
or it could be used to make a simple machine gun wall :smile.gif:.
I also made a trap based off of it. It's actually an interesting trap. Basically what I have is redstone wire out in the open, with a lever above it. The lever is also connected to a door (presumably where supposed treasure lies). And also in plain sight, you can see the wire connect to a dispenser with arrows in them. Now of course, any player would see that and do one of two things. Empty the dispenser, or break the wire. Assuming they break the wire, they activate the hidden dispenser on the other side of the wall, which then shoots an item on to a pressure plates, and shuts the door the first door, locking them in for 5 minutes (which is when the item will disappear). The beauty of the trap is even if the person decides to empty the dispenser, without break the first redstone wire, turning the lever on will power the wire, and will still activate the dispenser.
The only way for it to truly be bypassed is if they destroy the redstone wire that's two blocks away from the dispenser first. But you could probably build a much more efficient trap with hard redstone wiring. None the less, it's just a concept.
Of course, you can probably create a much more ef
seems like it really is just redstone based block updates instead, weird.
In fact, i'll do it right now.
EDIT:
Done! (Watch Below)
Edit nvm, he used a piston BUD
Easy to send signals thru solid floor. Just ude this setup:
where is a block
is a redstonetorch
is a piston (pushing the log)
and is redstone.
Power is sent thru the top redstone transmitted to the piston, pushing the log onto the torch, powering the other redstone. ~Rodol
This was back in 1.6, no pistons unfortunately.