[MC-6311] Minecarts don't bounce off redstone blocks when on powered rail

The Bug

The minecart rides down a powered rail and stops at the redstone block instead bouncing off and getting sent in the other direction. Also applies to minecarts that are standing still on the powered rail.

How to reproduce

Place a line of three rails
Place a powered rail on both ends
Place a redstone block behind one end (right side in screenshot)
On the other end (left side in screenshot), place a redstone block on the side and a different solid block on the end
Now place a minecart on the left powered rail
→✔ Notice the minecart starts to ride to the other side
→❌ also notice that it stops against the redstone block
Remove the cart and place another on the right powered rail
→❌ Notice the minecart stands still

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Related issues

is duplicated by

MC-137629 Minecarts stop at the end of tracks

MC-149145 Minecart won't push off of redstone block

MC-182364 minecart is no turn when wall is redstone block

MC-203675 Minecarts not bouncing off redstone blocks with powered rails

MC-203769 Minecart wont bounce directly into water

relates to

MC-171903 Back of stair blocks fail to accelerate minecarts placed next to them

Attachments

MC-6311.mp4

Comments

migrated 2013-01-05T22:13:35Z

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kumasasa 2013-01-05T22:23:42Z

Confirmed.

Tails 2013-01-07T15:48:13Z

Redstone is a transparent block. Minecarts only bounce off of solid blocks.

syberiyxx 2013-01-24T17:57:31Z

I would say that because the redstone block is in the shape of a solid block, it should behave like a solid block. It doesn't really make sense how it is IMHO.

Tails 2013-01-24T18:12:03Z

For feature suggestions/changes please use the MineCraft Forums: Suggestions.

Avoma 2021-02-04T18:41:11Z

Can confirm in 21w05b.

Avoma 2021-02-12T13:06:43Z

Can confirm in 21w06a.

Avoma 2021-02-18T18:49:44Z

Can confirm in 21w07a.

Avoma 2021-02-20T16:05:30Z

Video attached.

Avoma 2021-03-29T12:28:18Z

Can confirm in 21w11a.

Marty McFly 2021-10-12T15:22:19Z

Affects 21w40a

aceplante 2022-01-11T02:35:02Z

affects 1.17 and happens with glass too

Steve W 2022-01-13T15:22:50Z

This bug affects 1.18.1 as well.

When a Minecart is moving on a Powered Rail, one of the final checks it does is to see if it will bounce off of a wall. The function it uses for this check will let the Minecart bounce off if the block in question is considered a "solid block." For most blocks, there are two requirements to be a solid block:

The block's material must block light
The block must be a full cube

However, a block can be explicitly set not to be considered solid even if it otherwise meets the above requirements. Blocks set this way include:

Glass of all types
Beacon
Redstone Block
Observer
Piston (even retracted Pistons will stop a Minecart)

Glass and Beacons already fail the first check of blocking light. I assume that the rest were made non-solid for use in redstone contraptions. There are also a couple of odd blocks out:

TNT stops Minecarts (its material doesn't block light)
Soul Sand is explicitly set as a solid block, so Minecarts will bounce off

Possible fix: Modify the Minecart bounce-off check to work with full cube blocks. Replacing the check outright might make Soul Sand no longer work as it is hardcoded as solid and is not a full cube.

purpledragonnuke 2022-01-30T02:01:03Z

This isn't a bug, minecarts only bounce off solid blocks, and redstone blocks are transparent.

user-f2760 2022-01-30T06:09:10Z

Mojang has triaged this, so yes, it IS a bug.

Avoma 2022-05-15T11:17:41Z

Can confirm in 1.18.2 and 22w19a.

muzikbike 2022-10-16T22:52:27Z

Can confirm in 1.19.2:

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