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Hi all, I've been playing/watching BW for >10 years and I'm quite familiar with unit/building stats and many bugs/glitches.
But few days ago in one of my PvT games, I've encountered a weird thing... One of my Terran opponent's vultures get pass through my pylon wall, without using the "lay spider mine" trick...
replay file: static.iccup.com
at time=8:00, the vulture harassing Protoss's 3rd base (at bottom right), pass through the two pylons...
screenshot:
You can see that the vulture is now behind the pylon walls. and if you watch the replay, you'll also see that my dragoons can't get through.
And, according to this: http://wiki.teamliquid.net/starcraft/List_of_Unit_and_Building_Sizes Vultures and Dragoons are supposed to be the same size.
I've done a test in a single_player game, and the vulture can't get through that gap.
I've noticed that in the replay, the vulture did fire a shot when it was coming towards the two pylons' gap, maybe this has something to do with the "momentum"?
thoughts?? anyone~~? :D
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It's a normal trick. With that pylon positioning you have to put the vulture exactly in the corner between two pylons and with a little bit of spamming stop/hold (not sure, it just works :D) it will just get through. You can also use a mine trick to be sure.
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Wow you've been playing/watching for 10 years and only noticed this now :D It's a common trick whereby you can try to glitch a vulture through a pylon wall by laying a mine and hope the vulture goes through. Doesn't always work though.
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On April 12 2017 17:28 Dante08 wrote: Wow you've been playing/watching for 10 years and only noticed this now :D It's a common trick whereby you can try to glitch a vulture through a pylon wall by laying a mine and hope the vulture goes through. Doesn't always work though. Maybe you should read more carefully, he said, the vult did not lay a mine.
But yes, it is possible to glitch a vulture through without a mine, you have to use the momentum and press stop or attack as it moves to the gap. There was a discussion sometime ago about it: http://www.teamliquid.net/forum/bw-strategy/220903-simple-questions-simple-answers?page=169#3362
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Thanks for you guys' reply.
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I guess it works because the "effective wall" in a full diagonal position like that is only one pixel. It would be interesting to learn the exact mechanics behind it. I guess it is simply that units on stop or hold position command ignore collision for a frame (or a few). So in theory, with just the right stop/hold and then move across spamming it might be possible to jump even wider walls. The same trick should also work with (Dark) Archons and Worker units then, as these are all hovering units.
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@Freakling, I don't think that that is how it works -- the hitboxes in BW are all rectangular IIRC, and as you know, there is actually a significant gap between the pylons (which is why Zerglings can get through). It's definitely a collision bug, probably due to collision checking happening after every frame of movement, instead of before.
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What I mean is: There is a difference in behaviour between a unit running into a wall and a unit getting a stop or hold position command. For a hovering unit like a Vulture, if it runs into another unit blocking its path, it does stop instantly or starts going sideways to try to get around the obstacle. If however it received a stop command shortly before, it will be in a deceleration phase, but not have stopped completely yet. I think that, because the unit is considered in a non-moving state, but effectively still moving nonetheless, the collision check algorithm basically "cuts it some slack" and only realizes there is a collision when the Vulture is already overlapping the Pylon.
I made a little test map where every one can test different techniques to glitch through pylon walls at different angles. I found the best technique for Vultures and (Dark) Archons to be getting them to move in a perfect diagonal right into the gap and hitting stop shortly before. The hard part is actually getting them to move straight and go into the gap. I found that a lot easier to achieve with the (Dark) Archons. I also could not manage to glitch any units through for a top-right-to-bottom-left-direction diagonal wall whereas it was very easy to do for the top-left-to-bottom-right-direction ones. I also could not get Dragoons or Lurker (without burrow-stacking) through. Feel free to toy around with it yourselves and post your findings.
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