Changing gravity direction...

Questions & Answers
1

I have a simple script in C# that changes gravity vertically on the press of a button. Here it is:

using UnityEngine;
using System.Collections;

public class GravitronThingy : MonoBehaviour {
	
	public bool Gravitronned = false;
	
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		
		if(Gravitronned = true && Input.GetKeyDown(KeyCode.Q)) {
			Physics.gravity *= 1;
		}
		
		if(Input.GetKeyDown(KeyCode.Q)) {
			Physics.gravity *= -1;
			Gravitronned = true;
		}
	}
}

How would I switch from side to side? how about front to back?

Thanks in advance!

2

Just store Physics.gravity in a temporary variable, then have it always be equal to that variable (Vector3). Then change the x, y, and z values of your gravity variable.

Vector3 gravity;

void Start()
{
    gravity = Physics.gravity;
}

void FixedUpdate()
{
    Physics.gravity = gravity;
    
    if(somethingIsTrue)
    {
        gravity.x = 0;
        gravity.y = -25;
        gravity.z = 0;
    }
}
3

In unity you have (as you already know) Physics variable gravity that directs direction and force of gravity effect. It is simply a vector. So you can achieve all the effects you mention above by simply changing that vector to your needs. So to have it go left (assuming -X goes to your left)

Physics.gravity = new Vector3(-1.0f, 0, 0);

would do your job.

4

Unity Gravity is a vector. The vector can point in any direction. You’re interested in the up/down, left/right, forward/back, which happen to correspond to the 3 axes.

Up and down use the y axis.
Left and right use the x axis.
Forward and back use the z axis.

The Vector struct in Unity has properties that correspond to these axis directions.

Vector3.forward, Vector3.up, and Vector3.right.

So to set your gravity to the right, set it to Vector3.right * gravityAmount, where gravityAmount is the amount of force. To set it to the left, use -Vector3.right * gravityAmount. The - reverses the right direction so it points left. You can use this same method for the other directions.

5

First it seems you have some logic error where: If(Gravitronned = true … it needs ==

Second, your gravity is going to start out inversed which may be what you want, but where your going to have trouble is when you switch to normal gravity, and then back, because you will need to add Gravitronned = false in your first if statement. I hope that helps!

6

Use force over lifetime module, with a constant.