Magnetic ball

Questions & Answers
1

I’m wondering how should I do an magnetic ball for my game. I’m in process of learning C# so any tips/maybe some starting code (as I don’t have any clue where to start with this) would be appreciated in that language, but JS isnt problem either, I can always translate it to C#.

Magnetic ball?
I’m meaning this kind of ball that old PS1 classic had: “Kula World”

“Video of Kula World”

Meaning that it can’t drop off the level if you don’t jump off, and you can go even walls straight up, or you can go under the level and it won’t drop, but still if you’re under the level you can jump. Watch the video of Kula World and you’ll understand.

2

In your ball script:

public float jumpForce = 5f;

GameObject currentSurface;

ConstantForce _gravityOffset;
ConstantForce gravityOffset
{
    get
    {
        if (_gravityOffset == null)
        {
            _gravityOffset = gameObject.AddComponent<ConstantForce>();
        }

        return _gravityOffset;
    }
    
    set { _gravityOffset = value; }
}

void OnCollisionEnter(Collision c)
{
    //set object currently sticking to
    currentSurface = c.gameObject;
}

void OnCollisionStay(Collision c)
{
    if (c.gameObject == currentSurface)
    {
        //get contact point
        ContactPoint contactPoint = c.contacts[0];

        //set new gravity along the normal of contact point
        gravityOffset.force = (-1f * Physics.gravity) + (-1f * contactPoint.normal);
    }
}

void OnCollisionExit(Collision c)
{
    //leaving the surface
    if (c.gameObject == currentSurface)
    {
        currentSurface = null;
        gravityOffset.force = Vector3.zero;
    }
}

void Jump()
{
    //don't jump if not on a surface
    if (currentSurface == null) return;

    //add jump force away from current surface
    rigidbody.AddForce(-1f * gravityOffset.force * jumpForce);

    //return to normal gravity
    gravityOffset.force = Vector3.zero;
}