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建造下界传送门可以有多种用途。本页面列举了部分建造下界传送门的意义。
主世界的传送门可以用来长距离行走。
下界传送门相对来说距离更短:因为下界1格=主世界8格
首个传送门是风险的
传送门试图避免在岩浆上、半空中或在岩石里生成,但他们会在附近生成的前提下完成。因此,主世界里的一个新传送门有临近深渊、岩浆湖或地狱岩墙的风险。也不会检查岩浆是否注定浇在传送门上。而且,传送门可能在一格厚壁架、平台或灵魂沙堆上。
传送门会积累在主世界中的怪物
主世界的传送门应该在避免游荡的生物的情况下建造。这些生物会当玩家在附近做其他长时间的事情时持续积累。进入传送门后发现一些爬行者在另一边的传送门附近是灾难性的,因为地狱岩抗爆性并不好,所以爬行者的一场爆炸能够开出通向岩浆海的巨大坑洞。
刷黑曜石
传送门能建成一个网络
下界中相距小于64个方块(主世界中256个方块)的传送门让人联想到星门套件。你应该在相距64个下界方块的情况下(这是最大理想距离,它们也可以在主世界中相距16方块的情况下建造,如果标精确)尽管当你并不是经常使用这些传送门。因此这是当你用地狱门做长距离旅行时,目标传送门难以到达的原因(可能由于大量坍塌的沙砾、岩浆、水或自动返回门,你会被送回传送门网络)
可能两个主世界传送门链接至同一个传送门
主世界传送门X轴和Z轴同时距离1024以内的话,几乎在初步建设中会一直链接到同一个境界的传送门,因为主世界1024格等于下界128格,且游戏会检查目的地128格内是否已经有传送门(范围257x257x128)。
配对的传送门
适当地设置配对的传送门来可靠地在两个传送门中旅行。最好是手动建造。在希望的位置建造,然后传送到下界。然后挖开一条通向你传送门的XYZ值的X/8,Y,Z/8的位置,在那里建一个传送门。
一种不大准确的办法是暂时停用下界128格内的所有传送门。通过死亡或在另外一个玩家的帮助下,进入主世界中的新的传送门entering a new portal from the Normal World will force the creation of a new portal within the Nether which the Normal World portal should prefer. This is not recommended as it limits how close Normal World portals can be placed due to the Zone of exclusions and can lead to unpredictable placement of the resulting portal.
Zones of exclusion
The Nether portal spawning algorithm can only spawn portals that are within a 33×33 block column centered on the destination. This will often cause it to spawn a portal at a location significantly different than the corresponding location in the other world. The larger the distance between two linked portals, the larger the zone of exclusion. This zone is the area in each world where you cannot build another portal without breaking the link between the first two portals. One way to think of this zone is as spheres around each portal, each of a true radius equal to its distance to the other. For example, if the Normal world portal was at (0,50,0) and the Nether portal at (0,100,0), then each portal is 50 meters away from the other. In this (simple) case, if a Nether portal was built closer than 50 meters to (0,50,0), then the Normal World portal will now link to it.
If you wish to ensure that two portals link together, manually build portals as close as possible in all 3 coordinate axes. It doesn't have to be exact, or even all that close, if the player ensures that no other portals will be constructed in the exclusion zone created by the difference.
1-way long distance teleport
The portal choosing algorithm can be used for long distance travel by manual construction at carefully selected coordinates. If the player has a Portal in Normal world at (0,64,0) but makes a Nether Portal at (127,64,127) with its perfect Normal World pair at (1016, 64, 1016), then the portal at (0,64,0) will go to the Nether Portal correctly (1-way trip) because it is the only portal available within the 128 search distance along X and Z horizontal axes of the expected Nether portal position of (0,64,0). In about 15 seconds, the player can then travel 1436 meters in the Normal World. This specific form of fast travel by Portal is one-way, since the Nether portal will not find this Normal World portal. Given that a railway in the nether would need to span only 180 meters to go this distance, it is usually not worth making such portal links. However, it is theoretically possible to make a one-way ring of portals, with each Normal World to Nether jump going a long distance, but such a ring would easily be disrupted due to the huge exclusion zones created.[1]
Non-exploit water ladder replacement
The Nether Portal is an also entirely viable, two-way replacement for the water or conventional ladder.[2] Note that if you want to travel a vertical distance of h from a point (X, Y, Z) in the Overworld to (8*X, Y+h, 8*Z) in the Nether, there must be no other Overworld portal within a distance of 8*h from (X, Y, Z) (i.e. (X/8)² + (Y/1)² + (Z/8)² = h², note that Y is not divided by 8). That is, if you want to travel large vertical distances, there must be no horizontally close portal. (This holds for a portal from the Overworld to the Nether. The reverse direction (Nether to Overworld) was not discussed here.)
2-in-1 Nether Portals
It is possible to end up in a situation where a Nether Portal "randomly" places the player in 1 of 2 possible Normal World destination portals. This is simply because the Nether Portal has two effective coordinates as it is 2 blocks wide, say (X, Y, Z) on the left, and (X+1, Y, Z) on the right. If the player entered on the left side, (X, Y, Z) translates to (X*8, Y, Z*8) in the overworld and the game picks the portal closest to that. If the player entered on the right side, (X+1, Y, Z) translates to (X*8+8, Y, Z*8) and the game picks a portal closest to that point instead. This situation occurs when the Nether Portal's location is roughly equidistant between the 2 Normal World portals (within 8 blocks overworld distance difference). However, building 2 Nether Portals side by side is probably better for destination clarity than building a 2-in-1 portal. It is possible to span distances with pairs of portals in this way, though normally faster to simply walk through the Nether.[3]
Spawning a portal in the air
It is possible for a destination portal (either in the Nether or in the Overworld) to spawn floating in the air. If your portal spawns in the air, it will generate a 1×2×1 obsidian platform in the front and back of the portal. This can only occur if there is no possible spawn location in the entire 33×33×128 column of search region to find a suitable spot to place a fresh new portal AND there are no existing portals within the 128 block "radius" to link to.
Structure finder
With some luck, making a portal underground, entering the Nether and making another portal out of the other's proximity may create a portal in a stronghold, a cavern or even an abandoned mine shaft, all of which may contain a variety of rare minerals. (even diamonds, but the starting portal must be built under layer 16.)
References
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