英文:
How to change the direction of gravity in Sprite Kit
问题
我正在尝试制作一个关于台球的游戏。屏幕就像一张桌子，重力系统的默认方向是向下，也就是Y轴。我想将这个方向改变为Z轴，这样球既具有重力效应又不会掉下来。有人知道怎么做吗？谢谢。
英文:
I'm trying to build a game about billiards. The screen is like a table, the default direction of the gravity system is downward, that is, the Y axis. And I want to change this direction to Z axis, so the ball has both gravity effect and will not fall down. Does anyone know how to do this? Thanks.
答案1
得分: 2
physicsWorld.gravity在SpriteKit中是一个2D矢量（dx，dy），因此没有z轴的概念。
对于一个自上而下的台球游戏，你可以尝试将重力关闭 self.physicsWorld.gravity = .zero，然后使用 velocity 和 linearDamping 来模拟台球节点的真实滚动。
英文:
physicsWorld.gravity in SpriteKit is a 2D vector (dx,dy) and thus has no concept of the z axis.
for a top-down billiard game you might try turning gravity off self.physicsWorld.gravity = .zero and then use velocity and linearDamping on your billiard ball nodes to simulate realistic rolling.
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