鼠標移動

鼠標移動表示光標在屏幕上的瞬時位移（以像素為單位）： (${\textstyle dx,dy}$)。

在《我的世界》中，鼠標移動代表視角的即時旋轉(以角度表示)： (${\textstyle \Delta x,\Delta y}$)。

靈敏度

靈敏度(s)是一個參數，用於改變視角的旋轉速度。

可以在「控制」菜單中更改此設置。

• 默認靈敏度為"100%" (${\textstyle s=0.5}$)

• 原版中最低的靈敏度是"0%" (${\textstyle s=0.0}$)
• 原版中最高的靈敏度是"200%" (${\textstyle s=1.0}$)

在1.8中， ${\textstyle \Delta x}$ 計算如下:

$\Delta x=1.2dx\times (0.6s+0.2)^{3}$

${\textstyle \Delta y}$以同樣的方式獲得，如果打開了「鼠標反轉」，則乘以-1。

在默認靈敏度下(${\textstyle s=0.5}$)，鼠標移動一個像素轉換為0.15°旋轉。

這意味着視角以0.15°的增量移動：如果要轉45°，則需要移動鼠標300px。

此外，s理論上並不受 [0,1] 的限制，它可以取任何值（甚至是負值）

您可以在 options.txt （ .minecraft 文件夾中）中手動編輯 mouseSensitivity 的值

請注意，服務器上可能允許也可能不允許修改 options.txt 文件。

Remarkable values

由於可以將靈敏度設置為我們想要的任何值，因此調整靈敏度以匹配特定的旋轉增量可能會很有趣。

To get the required sensitivity for the desired increment ${\textstyle \delta }$, we can use the inverse formula:

$s={\frac {{\sqrt[{3}]{\frac {\delta }{1.2}}}-0.2}{0.6}}$

This table lists remarkable increments of rotation, and the corresponding values of s.

${\textstyle \delta }$	s
0°	-0.3333333
0.1°	0.3946504
0.15°	0.5
0.25°	0.6546926
0.5°	0.9115013
1°	1.2350600
45°	5.2452746
180°	8.5221547

Yaw and Pitch

Yaw (horizontal rotation) and pitch (vertical rotation) are floats that keep track of an entity's head rotation.

Facing is the restriction of the yaw to [-180, 180], as it is represented in F3. Pitch is naturally clamped between [-90, 90].

Mouse movement directly modifies the player's yaw and pitch:

/* In EntityRenderer.java */
public void updateMouseMovement(...)
{
    ... //previous code ignored
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
float f = this.mc.gameSettings.mouseSensitivity * 0.6F + 0.2F;
    float mult = f * f * f * 8.0F;
    float dX = (float)this.mc.mouseHelper.deltaX * mult;
    float dY = (float)this.mc.mouseHelper.deltaY * mult;
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
int i = 1;
    if (this.mc.gameSettings.invertMouse)
        i = -1;
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
... //Applies filters if smooth camera
</div>

    <div lang="en" dir="ltr" class="mw-content-ltr">
this.mc.thePlayer.rotateEntity(dX, dY*i);
}
</div>


<div lang="en" dir="ltr" class="mw-content-ltr">
/* In Entity.java */
public void rotateEntity(float dX, float dY)
{
    this.rotationYaw = this.rotationYaw + dX*0.15);
    this.rotationPitch = this.rotationPitch - dY*0.15;
    this.rotationPitch = MathHelper.clamp(this.rotationPitch, -90.0, 90.0);
}

While the pitch is clamped between -90° and 90°, yaw is not restricted between -180° and 180° as would be expected.

This means that yaw is unbounded, which has some unintended consequences if you deliberately turn in one direction for long enough.

By nature of being a float, its precision becomes worse the bigger it gets, to the point where it becomes noticeably jittery at large values.

• When $|yaw|>4194304$ (${\textstyle 2^{22}}$) it can only increase in increments of 0.5°.
• When $|yaw|>8388608$ (${\textstyle 2^{23}}$) it can only increase in increments of 1°.

At some point, yaw can even mess with movement and stop the player in place.

This is because the yaw gets too large to be converted to a proper angle (see Angles).

This phenomenon happens when $|yaw|\geq 11796480=360\times 2^{15}$.

Turning even further can crash the game, when ${\textstyle |yaw|>8.59\times 10^{9}}$