how to make a pivot point that things should rotate around unity code example

Example 1: unity rotate around pivot c#

public Transform customPivot;

void Update()
{
    transform.RotateAround(customPivot.position, Vector3.up, 20 * Time.deltaTime);
}

Example 2: rotate vector3 around pivot point unity

public Vector3 RotatePointAroundPivot(Vector3 point, Vector3 pivot, Vector3 angles) {    return Quaternion.Euler(angles) * (point - pivot) + pivot;  }