查看“Ball”的源代码

{{Languages|zh|球}}
{{Distinguish|This page is about the ball that can be directly controlled by the player by pressing down buttons on the keyboard, not the
 '''[[Prop ball]]''', which is a [[module]] and used as a type of props.}}
{{Translation}}
[[File:三种球.jpg|thumb|The appearance of three types of ball (from left: paper ball, wooden ball, and stone ball).]]
'''Ball''', or called the '''player ball''', is the core of [[Ballance]] and the only element that can be controlled by the player directly. The mean diameter of every type of ball is 4 meters: while the shapes of wood ball and stone ball are perfectly round, the paper ball is irregular, with its maximum width being 5 meters. By using [[transformer]]s the current ball type can be changed.

== Types ==
=== Wooden ball ===

The default type of ball when the player [[start]]s at Level 1–12. It has a mass of 1.9 tons, with a brownish-yellow wooden [[texture]]. It is made by gluing and splicing wooden strips with some green spots and scratches.

质量轻且灵活，是三种球类中手感最为均衡的。它可以推动各种[[机关大全|机关]]，但需要一定的助跑；遇见大量[[机关大全|机关]]时（如大量[[箱子]]）显得无能为力。此外，它可以被最少6个风扇叠加吹起；理论上可以跨过无数个[[箱式浮板]]（需要高技术水平）。

=== Stone ball ===

The default ball type on start of Level 13. 质量为10吨。外观总体上呈青绿色，表面有大量的坑。它的力量大，可以无需助跑推动各种机关；沙袋不容易阻挡它；但它的惯性巨大，不易操控。不过由此也可以被用在[[制图|自制地图]]中通过“过山车”式设计。事实上，第9、13关就有了这种设计。它还可以使[[软木桥]]断裂。此外，它可以被最少32个风扇叠加吹起；理论上可以跨过3个[[箱式浮板]]（需要高技术水平）。

=== Paper ball ===

The paper ball weighs 0.2 ton. There does not exist any paper [[transformer]]s in unmodified Level 1, and paper ball also cannot be used。其外观为数张报纸粘合而成的不规则白色球体，棱角分明；十分轻盈，可被风扇吹起，不会压开[[箱式浮板]]，但是不能推动大多数机关（[[升降机]]围墙可以被纸球用力助跑推开；[[推板]]在特定情况下能够被推开；[[箱子]]可以非常困难地推开；[[单摆]]可以被轻松推开）。此外，由于其表面不平整，因此无法以任何方式（包括借助定位杆对齐）与单轨对齐而安全通过。

== Physical parameters ==

Below are parameters of three types of balls ('''bold''' denotes difference from [[prop ball]]s):
{| class="wikitable"
|-
! scope="col"| Type
! scope="col"| Diameter of hitbox (meter)
! scope="col"| Friction
! scope="col"| Elasticity
! scope="col"| Mass (ton)
! scope="col"| Linear damping
! scope="col"| Rotational damping
! scope="col"| Force
|-
! scope="row"| Wood
| 4.0
| '''0.8'''
| 0.2
| '''1.9'''
| '''0.9'''
| 0.1
| 0.43
|-
! scope="row"| Stone
| 4.0
| '''0.5'''
| 0.1
| 10.0
| '''0.3'''
| 0.1
| 0.92
|-
! scope="row"| Paper
| Mean 4.0, maximum 5.0
| 0.5
| 0.4
| 0.2
| 1.5
| 0.1
| 0.065
|}
''Note: "Force" is the force on the ball when it is made to roll by the player pressing down the keyboard; as a result, it is meaningless to the prop balls.''

For references, below are parameters of [[prop ball]]s:
{| class="wikitable"
|-
! scope="col"| Type
! scope="col"| Diameter of hitbox (meter)
! scope="col"| Friction
! scope="col"| Elasticity
! scope="col"| Mass (ton)
! scope="col"| Linear damping
! scope="col"| Rotational damping
|-
! scope="row"| Wood
| 4.0
| 0.6
| 0.2
| 2.0
| 0.6
| 0.1
|-
! scope="row"| Stone
| 4.0
| 0.7
| 0.1
| 10.0
| 0.2
| 0.1
|-
! scope="row"| Paper
| Mean 4.0, maximum 5.0
| 0.5
| 0.4
| 0.2
| 1.5
| 0.1
|}

== Effects ==

* Balls can activate [[checkpoint]]s.
* Only when a ball comes near the modules will they be loaded, otherwise they are "frozen".
* Stone ball can break down [[suspension bridge]]s on contact, regardless of its mass (if changed by modifying [[Balls.nmo]]); however the prop stone ball will not do so.

== Did you know ==

* Shapes of the wood ball and the stone ball are perfect balls with the diameters of 4 meters, which are fixed in scripts, which means that only the appearances, not the hitboxes of wood/stone balls can be changed by modifying Balls.nmo; the shape of paper ball is irregular and its hitbox can even be modified in Balls.nmo. 
* Though the paper ball has a elasticity 4 times of the stone ball, 2 times of the wood ball, 修改Balls.nmo时将三者等比调高，制作出[[弹力球]]时却会导致石球表观弹力高于木球，木球表观弹力高于纸球。推测这可能是三者空气阻力不同所致。
* APaper balls can be blown by ventilators while prop paper balls can't.

{{element list}}