Change gravity with character rotation

Unity Engine
1

Greetings everyone!

I’m currently working on a 2D puzzle game, and I wish to change the gravity with the player rotation (z-rotation).

The player object is the parent and the camera is the child. If the z-rotation is free, the camera will rotate with the player.

I have tried with the following code:

 {

    public float rotate;

        void Update () {
        rotate = gameObject.transform.eulerAngles.z;

        if (rotate >= 45 && rotate < 100) {
            Physics.gravity = new Vector3(-20, 0, 0);

        }
       
    }

}

I can’t make it work. I have tried with different if statements. If the player reaches a degree between 2 variables the gravity will change, but I do think it is not stable and will have many flaws.

Thanks for taking your time reading this.

2

I think this approach is fine. The only thing to watch out for is wrap-around of the rotation values… you might want to add something like “if (rotate < 0) rotate += 360;” right after you get your rotate value (i.e. at line 7).

In what way does it not work?

1 Like
3

Thanks for your reply and the tip.

I have turned the rigibody off and tried to create a “default” gravity when the payer is “flat” on the platform (z is 0 or 360)
I have used following code, but the player keeps floating.

void Update () {
        rotate = gameObject.transform.eulerAngles.z;

        if (rotate >= 0 && rotate <= 360) {
            Physics.gravity = new Vector3(0, -15, 0);
        }
}
4

I’m confused. You said you turned the rigidbody off — that means it is no longer hooked into the physics system. So I wouldn’t expect Physics.gravity to have any effect. Do you have some other script that’s doing something with Physics.gravity?

5

Aaah, that explains it. I’m stil new and learning, I forgot it used the rigidbody. My fault and sorry. I have turned it back on.Thanks for helping.

The previous code is still not working. The gravity wont change, and I don’t understand why not

        if (rotate >= 45 && rotate < 100) {
            Physics.gravity = new Vector3(-20, 0, 0);

        }
6

Add some Debug.Log statements so you can see what’s going on.

        if (rotate >= 45 && rotate < 100) {
            Debug.Log("rotate = " + rotate + "; turning gravity sideways!");
            Physics.gravity = new Vector3(-20, 0, 0);
        } else {
            Debug.Log("rotate = " + rotate + "; leaving gravity alone.");
        }

This will spew a line to the console on every frame, which is not something you want to leave in there for long, but when you’re confused, you need a view into what’s happening. This ought to provide it.

Note that this code would change the gravity sideways, and then never change it back. Is that what you’re seeing?

1 Like
7

Thank you very much for the great help. I did not know you could use the debug like that! It have helped a lot.

I tried your code and it did turn the character sideways, but if you jump it will rotate the character and it will fly into the infinity and beyond. I do know how to fix it, I just need to add the other gravity functions.

1 Like