Unity 2D 手游：如何让世界重力跟随设备倾斜

Question

I know it could be a basic question for Unity developers. But I am struggling to find answers for this problem. I want to move all objects in my game screen based on device acceleration. I only think of 2 possibles solutions:

1st: change the whole world gravity based on device tilt

2nd: apply the forces to all objects or change the velocity of all objects (I tried changing the velocity but the game got lagging)

Is there any good way to make 2D game objects smoothly move based on device tilt?

Answer 1

You can do this by modifying Physics2D.gravity . It will change the gravity of all GameObjects in the scene.

Physics2D.gravity = Input.acceleration * 50; would have worked but because Input.acceleration has low, mid and high values, it wont work. So you can't assign Input.acceleration directly to Physics2D.gravity .

You need to turn on you device then use Debug.Log(Input.acceleration) to view the low, middle and high values of each axis then you can use if statement and temporary Vector2 value to get what 2D value to assign to Physics2D.gravity .

Also for any GameObject you want the accelerometer to affect more , less or not at-all , you can modify the RigidBody Gravityscale of that GameObject.

Answer 2

The gravity applied to all rigid bodies in the scene can be changed by setting Physics2D.gravity .

Note: Make sure you also set rigidbody.useGravity = true (for gravity to affect the objects).

Example: Physics2D.gravity = new Vector2(x, y);

Physics.gravity Unity API

Input-acceleration Unity API

Answer 3

Place this in the update() block of any element.

Physics2D.gravity is a "global" value that takes a Vector2 for value.

Debug.Log(Input.acceleration);
Physics2D.gravity = new Vector2(Input.acceleration.x*1.5f, Input.acceleration.y*1.5f);

(You may edit/remove the multiplying floats in each input acceleration property, I added them just for some exponential gravity speed.) Note: This will impact all the rigidbodies.