3D object to move left and right only? Mesh collider not working also!#

I've been following the procedural cave generation tutorial and recently uncovered some problems. My player come towards the camera, how would I make it go left and right, also at speed the mesh colliders do not work?

This is my code for the player script

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PlayerControl : MonoBehaviour {
5.  
6.     Rigidbody rigidbody;
7.     Vector3 velocity;
8.  
9.    
10.     void Start () {
11.         rigidbody = GetComponent<Rigidbody>();
12.     }
13.    
14.    
15.     void Update () {
16.  
17.         this.transform.Translate(Input.GetAxis("Horizontal"), 0, 0);
18.     }
19.  
20.     void FixedUpdate()
21.     {
22.         rigidbody.MovePosition(rigidbody.position + velocity * Time.fixedDeltaTime);
23.     }
24.  
25. }
26.  

 

why are you translating and altering the position of the rigidbody...???

 

if you want to move it left and right you should not only change the x axis but also the z position...

Code (CSharp):

1. void Update () {
2.         this.transform.Translate(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
3. }

second point, same as @LeftyRighty said, wy?

and because of collision, where's your OnCollisionEnter code ? google for it

 

I used that because i thought it would be better, im new to this kinda thing. Also the collider script is in my mesh generator.

 

Nevermind guys just figured out the collider part. Thanks anyway

(It was because my object was floating forward )