Unity3D运动左右失败

Question

I'm making an endless runner game, and I have stuck on a problem. I need my charater to move left to right, but it wont do it. I need it to move smooth from left to right and not in lanes. Since my game will be having random object popping up all over the trail.

I have assigened the left and right key to A and D in Unity.

Is it my code?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Ballmove : MonoBehaviour {

public KeyCode moveL;
public KeyCode moveR;

public float horizVel = -4;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
    GetComponent<Rigidbody>().velocity = new Vector3(-4, 0, 0);

    if (Input.GetKeyDown(moveL))
    {
        horizVel = -5;
        StartCoroutine(stopSlid());
    }
    if (Input.GetKeyDown(moveR))
    {
        horizVel = 5;
        StartCoroutine(stopSlid());
    }
}
IEnumerator stopSlid()
{
    yield return new WaitForSeconds(1);
    horizVel = -4;
}
}

Answer 1

So basically I forgot to assign horizVel and I also assigned the velocity to go left. I fixed the problem by doing this:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Ballmove : MonoBehaviour {

public KeyCode moveL;
public KeyCode moveR;

public float horizVel = 0;
// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {
    GetComponent<Rigidbody>().velocity = new Vector3(-4, GM.vertVol, horizVel);

    if (Input.GetKeyDown(moveL))
    {
        horizVel = -3;
        StartCoroutine(stopSlid());
    }
    if (Input.GetKeyDown(moveR))
    {
        horizVel = 3;
        StartCoroutine(stopSlid());
    }
}
IEnumerator stopSlid()
{
    yield return new WaitForSeconds(0.5f);
    horizVel = 0;
}

}

So this line GetComponent<Rigidbody>().velocity = new Vector3(-4, GM.vertVol, horizVel); should be GetComponent<Rigidbody>().velocity = new Vector3(-4, 0, horizVel); I have added some more since the fix.

Answer 2

You could use moveposition instead of velocity if you want to have more precise control over the object's position.

// Update is called once per frame
void Update () {
    var horizVel = 0;
    if (Input.GetKey(moveL))
    {
        horizVel += 3;
    }
    if (Input.GetKey(moveR))
    {
        horizVel -= 3;
    }

    GetComponent<Rigidbody>().MovePosition(this.transform.position + new Vector3(-4, GM.vertVol, horizVel) * Time.deltaTime);
}

}