[MC-6833] Doubled up TNT Carts creates huge lag ("Nuclear minecarts") Created: 10/Jan/13  Updated: 03/Apr/13  Resolved: 15/Jan/13

Status: Resolved
Project: Minecraft: Java Edition
Component/s: None
Affects Version/s: Snapshot 13w02a
Fix Version/s: Snapshot 13w03a

Type: Bug
Reporter: Zachary Freed Assignee: [Mojang] Nathan Adams
Resolution: Fixed Votes: 8
Labels: lag, minecart, rails, tnt, tntminecart
Environment:

Windows 7 64 Bit
Java 7


Attachments: PNG File 2013-01-10_18.10.06.png     Text File crash-2013-01-11_10.49.30-server.txt     Text File crash-2013-01-14_13.10.44-server.txt     Text File crash-2013-01-14_13.12.25-server.txt     JPEG File doubled_tntcart_effect_topview.jpg     JPEG File doubled_tntcart_effect_underground.jpg    
Issue Links:
Duplicate
is duplicated by MC-6804 minecart tnt bug Resolved
is duplicated by MC-6886 Freeze and crash after placing tnt carts Resolved
is duplicated by MC-7021 NUKE Explosion with 2 TNT-Minecarts Resolved
is duplicated by MC-7044 TNT Cart Lag Glitch. Resolved
is duplicated by MC-7194 Game crashes after attempting to plac... Resolved
is duplicated by MC-7224 TNT Minecarts crash game -3.43x10^144... Resolved
is duplicated by MC-7256 Some bugs with the new 'Minecart with... Resolved
is duplicated by MC-7324 Nuke Effect form TNT Minecarts Resolved
is duplicated by MC-7517 TNT Minecart memory leak Resolved
Confirmation Status: Unconfirmed

 Description   

If you get TNT carts, and just hold down when you place them on a rail, they will be doubled up in the same place. If you then push them, and they are about to fall off the edge, they will get stuck together, yet still continue gaining speed (You can tell from the sound). Furthermore, you can then destroy all the blocks under the connected rails, and the rails will float in mid-air. Eventually, the game will lag-out and crash, because of "ticking entities"



 Comments   
Comment by connor byers [ 03/Apr/13 ]

it still works....guys it just doesnt lag. thats that the problem was. its supossed to do this

Comment by hihi217 [ 02/Feb/13 ]

A small price to pay.

Comment by Howzieky [ 29/Jan/13 ]

but then you dont get the scoreboard :'(

Comment by hihi217 [ 20/Jan/13 ]

Guys, you can still download 13w02a to keep this so called "bug".

Comment by Howzieky [ 20/Jan/13 ]

NOOOOO! What have you people done!? YOU GOT THIS FIXED!

Comment by emil laviers [ 18/Jan/13 ]

don't report this bug!!!! its epic!!

now its fixed.
:'(

Comment by Nick Salonen [ 14/Jan/13 ]

attached crash reports related to TNT minecart crash. minecarts would lag out before even exploding visually. I just put two on a longer track with an activator in the middle.

Comment by Christopher [ 12/Jan/13 ]

I played last 2 days with this "feature" I really like it, but i think i can tell something about it.
If you put 2 or more Carts on a long down-track of Boosterrails they will give a huuuuuge explosion at this point, where one cart reach the straight line at the bottom an the following one cross its hitbox. More Speed/Carts=>larger Explosion. With 30 Boosters and 3 Carts i reached a radius of ~3.300!! Blocks. The Explosion will generate a lot of new Chunks and the "rays" don`t destroy bedrock, but they generate chunks too, if they go through void or air. My Map sized from 3,6MB to 53,6MB with one explosion.

Ah.. by the way. The Speed and the number of carts is relevant for crashing or exploding .
And i think the order of carts is really important for that. I got more results if i put the last cart at the front. In inverted order they drive through and explodes the regular way.

I made a Video about this. This one starts at Minute 7:45, where you can see the "Rays" and loaded chunks in Dynmap.
http://youtu.be/S2EEK1Y2-i8?t=7m41s

Comment by Sid Ben [ 12/Jan/13 ]

(X-post from MC-7194)

Made a video of this bug - http://www.youtube.com/watch?v=TK4ddR5iUEM

Dinnerbone, you must fix this. 2 pigs gave their lifes so this bug report could be made.

Comment by MegaScience [ 11/Jan/13 ]

In Snapshot 13w02b, I created a slope of powered rail. At the top, a dispenser with all 9 slots having a Minecart with TNT. I put a Comparator facing facing it and a lever on the other side so it would rapid-fire Minecarts with TNT. I pulled the lever and it sent all nine carts down the track very close together. When the first got to the end of the track, after passing over an Activator Rail, the game slowed down immensely, progressively getting even slower, with all the carts stopped. Eventually, the game crashed with the error report I am submitting. Upon reloading the game, the game held on the dirt background of the menu for a moment while the sound of TNT going off was heard, followed by the world loading normally with a large hole where the carts were.

Comment by MegaScience [ 11/Jan/13 ]

I had a Minecart with Furnace and Minecart with Chest on a 4x4 circle of powered rail. When I placed a Minecart with TNT between them, the furnace cart and TNT cart touched. Then all the carts stopped moving, even though the sound got progressively louder. I quickly started getting progressively longer lag spikes, until eventually the game simply froze. Luckily, MC-6834 prevented this bug from continuing on reload, since the TNT cart wasn't reloaded.

Comment by Huntard [ 11/Jan/13 ]

If you use only two carts or so you'll notice their is an explosion followed by the lag. However in my testing McEdit is required to remove all of the dropped items to actually see the effect. I've provided two screenshots from McEdit of the effects (titled double_tntcart_effect etc.). Using three carts my client simply crashes. NOTE: I was only using two, I got the effect when pushing them OFF a rail.

Comment by Fernando K [ 10/Jan/13 ]

I also posted this bug: MC-6841 that when minecarts are doubled they start to move indepently. Hopes to get fixed!

Generated at Sun Jan 12 12:12:31 UTC 2025 using Jira 9.12.2#9120002-sha1:301bf498dd45d800842af0b84230f1bb58606c13.