Help Uv mapping !!!

I have made a script that procedurally creates a cube and i need help uv mapping it. When it generates the texture looks all messed up and i don't know how to fix it. I compared my procedural cube to the cube the one that's comes with unity and it seems that the unity cube has 24 vertexes while mine has 8. May that be the problem? Here's my script: var check : boolean = true;

function Start () {

 var mesh : Mesh = GetComponent(MeshFilter).mesh;
 
 var vertices : Vector3[] = new Vector3[8];
     
     vertices[0] = new Vector3(.5, .5, .5); //high-top-left  (.5, .5, .5)
     
     vertices[1] = new Vector3(.5, .5, -.5); //high-top-right (.5, .5, -.5)
     
     vertices[2] = new Vector3(-.5, .5, -.5); //high-bottom-left (-.5, .5, -.5)
     
     vertices[3] = new Vector3(-.5, .5, .5); //high-bottom-right (-.5, .5, .5)
     
     vertices[4] = new Vector3(.5, -.5, .5); //low-top-left 
     
     vertices[5] = new Vector3(.5, -.5, -.5); //low-top-right
     
     vertices[6] = new Vector3(-.5, -.5, -.5); //low-bottom-left
     
     vertices[7] = new Vector3(-.5, -.5, .5); //low-bottom-right
  
 mesh.vertices = vertices;
 
 if (check){
     
 
     if (!Physics.Raycast (transform.position, Vector3.up, 1)) {
     
            print("Creating a face on top");
         
         mesh.triangles += [0, 1, 2, 0, 2, 3];
         
     }
    
 
     if (!Physics.Raycast (transform.position, Vector3.down, 1)) {
     
         print("Creating a face on botton");
         
         mesh.triangles += [7, 6, 4, 6, 5, 4];
     
     }
 
     if (!Physics.Raycast (transform.position, Vector3.right, 1)) {
     
         print("Creating a face on right");
         
         mesh.triangles += [0, 4, 5, 5, 1, 0];    
     
     }
 
     if (!Physics.Raycast (transform.position, Vector3.left, 1)) {
     
         print("Creating a face on left");
     
         mesh.triangles += [3, 6, 7, 6, 3, 2];
     
     }
 
     if (!Physics.Raycast (transform.position, Vector3.forward, 1)) {
     
         print("Creating a face on front");
              
         mesh.triangles += [0, 3, 4, 7, 4, 3];
     
     }
 
     if (!Physics.Raycast (transform.position, Vector3.back, 1)) {
     
         print("Creating a face on back");
     
         mesh.triangles += [5, 2, 1, 2, 5, 6];
     
     }
     
     var uvs : Vector2[] = new Vector2[8];
     
     uvs[0] = new Vector2(0, .5); //bottom-right
     
     uvs[1] = new Vector2(.5, .5); //middle
     
     uvs[2] = new Vector2(0,0); //bottom-left
     
     uvs[3] = new Vector2(.5, 0); //top-left
     
        uvs[4] = new Vector2(0, 0); //top-left
     
     uvs[5] = new Vector2(0.5, 0.5); //top-right
     
     uvs[6] = new Vector2(0, .5); //bottom-left
     
     uvs[7] = new Vector2(.5, .5); //bottom-right
     
     mesh.uv = uvs;
     
     mesh.RecalculateNormals();
     
     check = false;
 
 }

}

PS: I'v researched this but did not fined a answer.