碰撞

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Minecraft 的碰撞物理非常简单：游戏没有光线追踪碰撞，而是简单地沿每个轴顺序移动玩家。

在此提醒，Minecraft的物理更新速度为每秒 20 ticks。玩家的移动和碰撞每Tick更新一次。

碰撞箱

一个碰撞箱由一个或多个边界箱组成，边界箱是由最小和最大 X/Y/Z 坐标定义的简单长方体。

碰撞通常涉及一个实体和一个方块：方块和方块之间通常不会相互碰撞。

注意：判定箱'是玩家可以点击的（例如攻击实体、按下按钮、打开门）。它不一定与碰撞框重叠。

Every tick, after the player's velocity has been updated, the game does these steps to check collisions:

Move the player along the Y axis. If a vertical collision is detected while moving downward, the player is now considered to be on ground.
Move the player along the X axis.
Move the player along the Z axis.
If the player is on ground and collided with a wall, they are able to step over it if it's less than 0.6m tall.
- See Stepping for explanations and visuals.
- This mechanic is responsible for Blips and Jump-Cancel, and their glitched variants.

Vertical movement is processed before horizontal movement. Due to this:

The player is able to jump one tick after running off a block. In particular, this is why headhitter timing works.
To land on a block, the player's bounding box must overlap its surface on the final tick of the jump.

When the player hits a floor or ceiling, their vertical speed is reset to 0.

Due to the X axis being processed before the Z axis, corner collisions don't behave the same depending on the direction.

This phenomenon is especially noticeable with more speed.

It's important to distinguish "X-facing" jumps from "Z-facing" ones:

X-facing refers to jumps that point towards East/West. The corner is difficult to avoid, and the player may have to start jumping further back than expected.

Z-facing refers to jumps that point towards North/South. The corner is easier to avoid, and in particular it's possible to do a hh-timing from the front.

The axis of a jump can be checked with F3.

Players tend to find Z-facing neos more intuitive, but X-facing neos can actually be more lenient:

Z-facing neos are very similar to linear jumps (assuming optimal movement). To convert a neo, simply add 1.2 to its distance and increase its tier by one. For example, a triple neo is equivalent to a "4.2+0.25" (which cannot be built, but this sort of comparison is useful for analysis)
X-facing neos don't have a linear equivalent. Compared to Z-facing neos, they are "shifted" by 1 tick (wall collision begins and ends 1 tick earlier). This shift reduces the momentum, but makes it more efficient as the player typically has more speed at the end of a jump than at the start.

Some jumps are only possible when facing one axis or the other (for example, a 2bm triple neo is only possible X-facing)

In 1.14, the collision physics were updated. The collision order now depends on the player's velocity:

If the player has more Z speed than X speed (in absolute value), the collision order is Y-X-Z.
Otherwise, the collision order is Y-Z-X.

In most cases, all collisions now resemble X-facing. Some jumps which involve cutting corners may be very different compared to pre-1.14.