boundary area for the player when the camera moves

Hello friends.
So, im trying to make a boundary area(what ever will work for my game).
I would prefer a "physical" area(like a collider or something i can attach as a gameobject to the camera.
The thing is that this is going to be a 3d shoot em up, just like Sine Mora.
But i need help finding a way to keep the player inside an confined area as the camera and the player is moving around the level. i dont want the level to move towards a static playing area.
I could take the easy way and just box in the player with colliders, but i guess im going to see alot of twitching when the player is "pushed" forward, or stopped against a collider wall.
And i guess that it might be a leak thru a collider when it doesnt do its job and let the player thru bcus it cant update fast enough.
So, what is your suggestions?
I need to use all directions, but mostly X,Y, but if im going to make cinemachine angles i might need the Z axis.

 

i figured it out.
i just put the player as a child of the camera. using the cameras local 0.0.0 and clamp the players movement there with this:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using Rewired;
4.  
5. public class PlayerMoveRewired: MonoBehaviour
6. {
7.     public float xMin;
8.     public float xMax;
9.     public float yMin;
10.     public float yMax;
11.  
12.     public int playerId = 0;
13.  
14.  
15.     public float moveSpeed = 3.0f;
16.  
17.  
18.     private Player player;
19.     private Vector3 moveVector;
20.  
21.     void Awake()
22.     {
23.         player = ReInput.players.GetPlayer(playerId);
24.     }
25.  
26.     void Update()
27.     {
28.         ProcessInput();
29.         transform.position = new Vector3(Mathf.Clamp(transform.position.x, xMin,xMax),
30.             Mathf.Clamp(transform.position.y, yMin, yMax),transform.position.z);
31.     }
32.  
33.  
34.     private void ProcessInput()
35.     {
36.         transform.Translate(moveSpeed*player.GetAxis("Move Horizontal") * Time.deltaTime, moveSpeed*player.GetAxis("Move Vertical") * Time.deltaTime,0f);
37.     }
38. }

worked like a charm.

thanx Alexander Zotov for your short and precise explanation.

 

realised i had to make it a localposition.
code update:

Code (CSharp):

1.         transform.localPosition = new Vector3(Mathf.Clamp(transform.localPosition.x, xMin, xMax),
2.         Mathf.Clamp(transform.localPosition.y, yMin, yMax),Mathf.Clamp(transform.localPosition.z,1,1));
3.     }