How do I rotate an object around a certain point?

Questions & Answers
1

I have this piece of code:

if (Input.GetMouseButton(2))
    {
           float mouseInput = Input.GetAxisRaw("Mouse X");
           angle += mouseInput;
    
           Vector3 offset = new Vector3(Mathf.Sin(angle), 0, Mathf.Cos(angle));
           transform.position = offset;
      }

It reads my mouse movements and then moves a sphere in a circle around the center of the worldspace.

The problem is, it doesn’t matter where I put the sphere before starting the game, it always snaps back to rotate around the worldspace center. I can’t figure out how to fix it.

Could anybody help me?

2

This is because you are setting the position to just your offset, if you want to rotate it around a set point you need to tell it what that point is and also what radius you want it to rotate at.

public Transform rotationCenter;
public float radius;

Update () {
    if (Input.GetMouseButton (2)) {
        float mouseInput = Input.GetAxisRaw ("Mouse X");
        angle += mouseInput;

        Vector3 offset = new Vector3 (Mathf.Sin (angle) * radius, 0, Mathf.Cos (angle) * radius);
        transform.position = offset + rotationCenter.position;
    }
}