Riding a Minecart Through a Nether Portal
WHAT: I'd like to be able to have minecarts with entities in them such as the player, villagers, or sheep be able to go through a nether portal and preserve their direction and momentum on the other side.
WHY: We could have a rail network that travel between dimensions without having to get in and out of a minecart, or breaking a replacing the minecart in the case of mobs being transported. This way we could get to bases we have have in the nether without changing rail lines between dimensions. It would make it much easier to transport mobs large distances. For instance, we could bring mushrooms back to our base through the nether. When the player, mobs, projectiles, dropped items, or empty minecarts pass through the portal, they all go through to the other side, preserving their direction and momentum. Intuitively most players would assume that a minecart with an entity in it should follow the same logic. It can be frustrating for new players to figure out why their minecart won't go through.
HOW: The code already exists in the game for entities passing through the portal to preserve their momentum and direction. The code for a minecart without a rider passing through the portal without a rider exists in the game as well. If the code for a minecart was modified to check to see if it had a rider and if so, both the minecart and rider were teleported to the other dimension, it could solve this problem.
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