using UnityEngine;
using System.Collections;

public class GridManager: MonoBehaviour
{
   public GameObject Hex;

   public static int gridWidthInHexes = 100;
   public static int gridHeightInHexes = 100;

   private float hexWidth;
   private float hexHeight;
     

   void setSizes()
   {
    hexWidth = Hex.renderer.bounds.size.x;
    hexHeight = Hex.renderer.bounds.size.z;

   }
     
   Vector3 calcInitPos()
   {
    Vector3 initPos;
    initPos = new Vector3(0, 0, 0);
    return initPos;
   }
     
   //method used to convert hex grid coordinates to game world coordinates
   public Vector3 calcWorldCoord(Vector2 gridPos)
   {
    //Position of the first hex tile
    Vector3 initPos = calcInitPos();
    //Every second row is offset by half of the tile width
    float offset = 0;
    if (gridPos.y % 2 != 0)
     offset = hexWidth / 2;
      
    float x =  initPos.x + offset + gridPos.x * hexWidth;
    //Every new line is offset in z direction by 3/4 of the hexagon height
    float z = initPos.z + gridPos.y * hexHeight * 0.75f;
    return new Vector3(x, 0, z);
   }
     
   //Finally the method which initialises and positions all the tiles
   void createGrid()
   {
    //Game object which is the parent of all the hex tiles
    GameObject hexGridGO = new GameObject("HexGrid");
      
    for (float y = 0; y < gridHeightInHexes; y++)
    {
     for (float x = 0; x < gridWidthInHexes; x++)
     {
      //GameObject assigned to Hex public variable is cloned
      GameObject hex = (GameObject)Instantiate(Hex);
      //Current position in grid
      Vector2 gridPos = new Vector2(x, y);
      hex.transform.position = calcWorldCoord(gridPos);
      hex.transform.parent = hexGridGO.transform;
      //Debug.Log("HexClone position is (" + gridPos.x + "," + gridPos.y + ")");
     }
    }
   }

   void Start()
   {
    setSizes();
    createGrid();
   }
}

using UnityEngine;
using System.Collections;

public class Hex : MonoBehaviour {

  Vector2 gridPos;

  void Start () {}
   
  void Update () {}

  void OnMouseEnter() {
   transform.renderer.material.color = Color.yellow;
   Debug.Log("HexClone position is (" + gridPos.x + "," + gridPos.y + ")");
  }
   
     void OnMouseExit() {
   transform.renderer.material.color = Color.white;
  }
}