TheFlop123456's Piston Bug

Wonder what the hell is going on here...?

This entry is for my adventure map encounter competition. http://youtu.be/FQxHn4q7Nvo

Category:

Gaming

Tags:

• adventure
• map
• competition
• jigarbov
• theflop123456
• piston
• bug
• pulse

[cxgamer]

Why would you assume that's "clearly" a 1 tick pulse? Do the math: the repeater is at 3 ticks delay and the torch has 1 tick delay before they're OR'ed together, so that's 2 redstone tick delay. Or even 4 game ticks if you want to get technical. The line above it has nothing to do with it, as it's too far away.

This is expected behavior.

[jigarbov]

@cxgamer Because I've built many of these before and in ever case (except this one) having the repeater set to 3 resulted in the torch going on for a single tick. This is an anomaly. Build one yourself and check it out. This certainly isn't expected, I've used these a tonne of times in many builds, this is the first one I've seen that has acted like this.

[cxgamer]

@jigarbov I'm sorry to go into discussion with you on this matter. But torches are unable to produce single-tick pulses (minecraftforum.ne t/topic/156595-more-redstone-q­uirks-for-hardcore-redstone-fa­natics)

The torch is producing a 2-tick pulse. I hope you don't take offense.

[jigarbov]

@cxgamer I don't take offence, maybe I have the tick count wrong, but this design is supposed to leave a block behind and it isn't and it's frustrating >:O

[KamiPrestige]

@cxgamer Even weirder, pistons retracting, as they do in Jig's example to leave a block without pulling it back, actually takes 0 ticks to perform. The illusion is created by the retracting animation, the time takes to process is 0 ticks, which is why you get this behaviour, and it is also used when instant wiring. It is a funny part of redstone logic, but I believe this effect seen in the video is incorrect, but I haven't seen the wiring.

[cxgamer]

@KamiPrestige Correct. They produce the same behavior. This behavior has puzzled me as well, as pistons take 3 game ticks, and a redstone tick only two 2. So the piston should have been done moving for 1 game tick (or 0.5 redstone ticks).

Haven't looked at the code personally though. I'm not a piston expert.

[KamiPrestige]

@cxgamer 2 tick pluses produce the same effect as a 1 tick pulse does on a sticky piston though. I have just tested it, 1 tick from the repeater + 1 tick from the torch still works. Even fed through a monostable circuit, then 2 ticks applied from a repeater will cause the same behaviour. Any more than 2 will not work. It is debatable whether even 2 ticks should work.

[KamiPrestige]

I have noticed this before too, seems a few people have. I am not sure why it happens fully, but if you add a one tick monostable circuit just before the piston then it sorts it, not a perfect fix and i am not sure if adding this would still make it valid within 20x20x20, but I have found it to fix the problem:) The only thing I can imagine it being is a bug with orientation of the piston, use MC edit to turn the project 90 degrees and try it, might work:)

[Fangridecraft]

That... is really odd... I think I'll try messing around with it myself. I seem to be good at randomly solving redstone bugs.

[NabsterHax]

I did some experimenting myself with this. I build the EXACT same thing over and over again in several directions with the same orientation/rotation and half of them gave me a 1-tick pulse, the other half... nothing.

I'm not sure if it's random or not, but it definitely needs more investigation.