How to rotate/move diagnal with rigidbody sphere

Questions & Answers
1

Having trouble with the physics here. I want the player(sphere game object) to be able to roll in every direction to navigate through the platform course. I can now go back and forth but trying to go to the side or diagnal isnt working properly here is the script. What am I doing wrong exactly?

 UnityEngine;
using System.Collections;

public class SphereController : MonoBehaviour {


    //The constant forward speed.
    public float sphereSpeed;
    //The user controlled left and right speed.
    public float leftRightSpeed;

    //Win or Loss.
    public bool win;
    public bool gameOver;

    //The visual partical effect for when we collide.
    //Just a cheap example.
    public GameObject prefabVisual;
	
	
	void Update () 
    {
        rigidbody.AddForce(Input.GetAxis("Horizontal"), 0, 0 * leftRightSpeed);
        //transform.Rotate(new Vector3(0,Input.GetAxis("Horizontal"),0));
        rigidbody.AddForce(0, 0, Input.GetAxis("Vertical") * sphereSpeed);
        //Move forwards or backwards.
        

        if (transform.position.z >= 19)
        {
            win = true;
            //Disable movement of the sphere.
            //Here we could load a different scene. Win screen, highscore screen, etc.
            this.gameObject.GetComponent<SphereController>().enabled = false;
        }
	}

    void OnCollisionEnter(Collision other)
    {
        //If we hit a obstacle.
        if (other.gameObject.tag == ("Obstacle"))
        {
            //Tell us what we hit.
            Debug.Log("Hit an obstical" + other.gameObject);
            
            //gameOver = true;

            //Instantiate the prefabVisual.
            Instantiate(prefabVisual,transform.position,transform.rotation);
            
            //Disable movement of the sphere.
            this.gameObject.GetComponent<SphereController>().enabled = false;
            
            //Make the sphere dissapear.
            this.gameObject.GetComponent<MeshRenderer>().enabled = false;
            //Could add a game over scene now.
        }
    }
}
2

You have a few variables in the wrong place, make sure you set the values of sphereSpeed and leftRightSpeed in the inspector.

GetAxis returns either -1, 0, or 1. You are taking that value and multiplying it by your speed to move. Also check the FixedUpdate function, when dealing with forces it’s recommended to use FixedUpdate.

	//The constant forward speed.
	public float sphereSpeed = 1;
	//The user controlled left and right speed.
	public float leftRightSpeed = 1;

		
	// Update is called once per frame
	void FixedUpdate () {
		rigidbody.AddForce(Input.GetAxis("Horizontal") * leftRightSpeed, 0, 0);

		rigidbody.AddForce(0, 0, Input.GetAxis("Vertical") * sphereSpeed);
	}