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Ceiling Hover is a glitch that makes the player "hover" between a ceiling and a bouncy block (slime, or beds since 1.12). It can be performed by jumping under a ceiling such that the block 2.001b below the ceiling has bouncing properties.

解释

每当玩家与一个方块（地板或天花板）垂直碰撞时，游戏将应用碰撞物理。

对于几乎每个方块，这只是意味着将玩家的垂直速度设置为 0。

/* in class Block */
public void onVerticalCollision(Entity entityIn)
{
    entityIn.motionY = 0.0D;
}

但有一个例外：粘液块（和 1.12+ 中的床）。

/* in class BlockSlime */
public void onVerticalCollision(Entity entityIn)
{
    if (entityIn.isSneaking())
        super.onVerticalCollision(entityIn);
    else if (entityIn.motionY < 0.0D)
        entityIn.motionY = -entityIn.motionY;
}

如果玩家正在潜行，它将被视为常规碰撞(垂直移动设置为0)
否则，它将检查玩家的速度是否为负，然后将其反转。

请注意，如果玩家以某种方式以正速度移动（而不是潜行），则不会发生任何事情。

事实上，这正是这个故障发生的情况。

当游戏检测到垂直碰撞时，它会考虑在玩家位置下0.2米的方块应用碰撞物理(就算是天花板碰撞……)

让我们回顾一下1.8125bc天花板悬停设置的步骤:

在1.8125bc下跳跃会与玩家下方0.2米的方块发生垂直碰撞(在地面)
如果方块是黏液方块，那么垂直速度不会设置为0，玩家仍然悬挂在天花板下。
重复步骤(2)，直到玩家的垂直速度由于重力而变为负值。

Note: This glitch happens for a few ticks, but with Jump Boost it would take longer. Ceiling hover can be interrupted at any time by sneaking.

Consequences

This glitch is pretty insignificant: it isn't game-breaking in any way, and requires very specific setups to be made use of.

@@ Line 58: / Line 58: @@
+让我们回顾一下1.8125bc天花板悬停设置的步骤:
-<div lang="en" dir="ltr" class="mw-content-ltr">
-Let's review the steps for the 1.8125bc Ceiling Hover setup:
+#在1.8125bc下跳跃会与玩家下方0.2米的方块发生垂直碰撞(在地面)
+#如果方块是黏液方块，那么垂直速度不会设置为0，玩家仍然悬挂在天花板下。
-# Jumping under 1.8125bc applies vertical collision with the block 0.2m below the player (at ground level).
+#重复步骤(2)，直到玩家的垂直速度由于重力而变为负值。
-# If that block is a slime block, then vertical speed won't be set to 0, and the player remains suspended under the ceiling.
-# Repeat step (2) until the player's vertical speed becomes negative due to gravity.
-</div>