[MC-12730] TNT falls through fences and walls when ignited whilst on top of them

The Bug:

TNT falls through fences and walls when ignited while on top of them.

Steps to Reproduce:

Place down a fence or a wall, and the place some TNT on top of it.
Ignite the TNT and watch it closely.

Observed Behavior:

TNT falls through fences and walls when ignited whilst on top of them.

Expected Behavior:

TNT would not fall through fences and walls when ignited whilst on top of them.

Code Analysis:

The following is based on names using yarn (20w06a).

As said above, the TNT hops, but because of the fence being 1.5 blocks high, the TNT hops into the fence's hitbox and as result falls through. The "hop" has a motionY (vertical motion) of 0.20000000298023224 in the net.minecraft.entity.TntEntity.TntEntity initial method. This vertical motion is not enough to get on top of the fence/wall's hitbox. A suggested value would be; 0.22649273522D. Changing this initial value has very little impact to no impact (from 6 pixel high jump to 8 pixels jump, roughly).

As mentioned above already; change the initial motion (setVelocity) to: 0.22649273522.

this.setVelocity(-Math.sin(double10) * 0.02, 0.22649273522, -Math.cos(double10) * 0.02);

Related issues

is duplicated by

MC-78019 TNT pass through fence

MC-115650 cobblestone wall and tnt

MC-120637 fence and tnt

MC-123420 entities go inside blocks

MC-161721 bug with fence and dynamite

MC-170132 Primed TNT phases through fence/wall

MC-172108 Tnt being ignited above fences fall through the fence

MC-217789 Lit tnt can go thru walls

MC-235382 tnt crosses half blocks when activated

MC-237914 TNT sinks into walls and fences

MC-266307 TNT glitches into walls, fences or fence gates if detonated above

relates to

MC-2208 Blocks with special placement can be placed inside player / entity

MC-136869 TNT falling through slabs when ignited it

MC-53915 Primed tnt glitching through blocks

Attachments

MC-12730.mp4

Comments

migrated 2013-03-23T22:12:28Z

[media][media][media][media][media]

migrated 2013-03-23T22:25:37Z

Confirmed.

migrated 2014-06-24T16:30:35Z

Fixed in 1.8

migrated 2014-06-24T21:06:13Z

Confirmed fixed.

kumasasa 2015-11-21T11:27:48Z

Back in 15w47c

migrated 2018-08-01T10:51:06Z

Confirmed for 1.13 & 18w30b.

migrated 2018-08-01T20:05:22Z

Confirmed for 18w31a.

migrated 2018-08-08T15:00:28Z

Confirmed for 18w32a.

migrated 2018-08-15T15:41:03Z

Confirmed for 18w33a.

migrated 2018-08-22T20:14:13Z

Confirmed for 1.13.1.

migrated 2018-10-19T16:44:00Z

Confirmed for 1.13.2-pre2. Please, if you don't mind, I'd like to be the reporter of this ticket.

marcono1234 2018-12-09T17:17:41Z

@@unknown, you are now the reporter.

migrated 2019-05-31T00:30:40Z

Confirmed for 1.14.2.

migrated 2019-07-26T15:29:28Z

Confirmed for 1.14.4.

migrated 2019-07-26T15:50:21Z

cannot have happened in unrealeased version

migrated 2019-07-26T16:32:35Z

What do you mean? Minecraft 1.14.4 has been a released version as of July 19th, and its the 26th as of writing this comment.

migrated 2020-01-21T01:26:30Z

Confirmed for 1.15.1 and 1.15.2 pre2 (I think)

migrated 2020-02-08T13:36:03Z

Confirmed for 20w06a. Please change the reporter to me, so I can keep it updated.

migrated 2020-06-07T20:47:48Z

Confirmed for 1.16 Pre-release 2.

migrated 2020-06-10T20:08:58Z

Confirmed in 1.16-pre3.

migrated 2020-06-11T19:29:18Z

Confirmed in 1.16-pre4.

migrated 2020-06-12T19:53:43Z

Confirmed in 1.16-pre5.

migrated 2020-06-16T08:50:12Z

Confirmed in 1.16-pre6.

migrated 2020-06-17T09:12:24Z

Confirmed in 1.16-pre7.

migrated 2020-06-18T12:24:30Z

Confirmed in 1.16-pre8.

migrated 2020-06-20T12:08:08Z

Confirmed in 1.16-rc1.

pulpetti 2020-07-17T12:53:35Z

Can confirm for 1.16.1 and 20w29a

Avoma 2020-12-23T10:48:37Z

Can confirm in 20w51a.

Avoma 2021-01-28T14:17:30Z

Can confirm in 21w03a.

Avoma 2021-02-05T20:15:07Z

Can confirm in 21w05b.

Avoma 2021-02-12T13:14:28Z

Can confirm in 21w06a.

Avoma 2021-02-18T19:05:42Z

Can confirm in 21w07a. Video attached.

Avoma 2021-03-27T10:27:35Z

Can confirm in 21w11a.

Avoma 2021-04-19T08:58:03Z

Can confirm in 21w15a.

Avoma 2021-04-30T13:15:02Z

Can confirm in 21w17a.

Lukornia 2021-05-26T21:29:17Z

Can confirm in 21w20a.

Lukornia 2021-05-27T20:26:22Z

Can confirm in 1.17 Pre-release 1.

Lukornia 2021-06-05T05:17:57Z

Can confirm in Minecraft 1.17 Pre-release 2.

Lukornia 2021-06-05T05:27:33Z

Can confirm in 1.17 Pre-release 3.

Lukornia 2021-06-05T05:34:31Z

Can confirm in 1.17 Pre-release 4.

Lukornia 2021-06-05T05:40:28Z

Can confirm in 1.17 Pre-release 5.

Lukornia 2021-06-05T05:49:30Z

Can confirm in 1.17 Release Candidate 1.

FaRo1 2021-06-05T09:42:32Z

@unknown Adding versions other than the latest release or snapshot is much harder to do and usually not worth it. You also don't need a separate comment for each of these.

Lukornia 2021-06-05T17:56:49Z

Good to know Fabian, thanks!

migrated 2021-06-05T17:59:55Z

Can confirm in 1.16.5

migrated 2021-06-05T18:02:17Z

Also, the tnt can only fall through 1 fence

If placed on more fences it will not fall through

migrated 2021-06-05T18:10:09Z

If it’s in the air, the tnt will fall thru the fence like there isn’t anything there

if there is a fence below it it will fall about half way down since the fences are 1.5 blocks tall

Lukornia 2021-06-07T15:15:32Z

Can confirm in 1.17 Release Candidate 2.

Avoma 2021-07-08T18:06:05Z

Can confirm in 1.17.1.

Avoma 2021-09-29T15:23:45Z

I'd like to request ownership of this ticket since the current reporter has been inactive for over a year. I'm willing to keep this ticket updated and will continue to provide all of the necessary details.

[Mod]Les3awe 2021-09-29T15:50:17Z

@@unknown, completed.

Avoma 2021-09-29T18:10:06Z

Thanks very much @unknown. 🙂