Unity3D sphere rotation and always keeping rotation direction - unity3d

Question

I have a sphere gameobject with 5 cubes placed on different points on the surface of the sphere. When a key is pressed, i would like the sphere to spin for a few seconds and then slowly stops on the first cube point on the cube and always keeping the same direction in rotation. The issue i am facing now is that, Quaternion.Slerp always takes the shortest path to the next cube which means sometimes the rotation direction is changed. Any ideas?
Thanks

Answer 1

You can easily handle the rotation as a Vector3 of Euler angles.
This way you can Linearly Interpolate the angles to the correct value. And you can use coterminal angles so that you're always interpolating to a higher value ( so no backwards rotations would occur ). After every rotational step you might want to normalize the angles to the 0, 360 range with this approach though.
Example Code :
using UnityEngine;
using System.Collections;
public class Rotation : MonoBehaviour {
public Transform firstPosition;
public Transform secondPosition;
public float rotationDuration = 3;
void Start () {
transform.rotation = firstPosition.rotation;
StartCoroutine(Rotate());
}
IEnumerator Rotate() {
var deltaTime = 0.0f;
var distance = firstPosition.rotation.eulerAngles - secondPosition.rotation.eulerAngles;
while(deltaTime < rotationDuration) {
var rotation = transform.rotation.eulerAngles;
rotation = firstPosition.rotation.eulerAngles + deltaTime/rotationDuration*distance;
transform.rotation = Quaternion.Euler(rotation);
deltaTime += Time.deltaTime;
yield return null;
}
transform.rotation = secondPosition.rotation;
}
}