I want to rotate my chess pieces to -90° as they are spawning horizontally.

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

public class BoardManager : MonoBehaviour {

 private const float TILE_SIZE = 1.0f;
 private const float TILE_OFFSET = 0.5F;

 private int selectionX = -1;
 private int selectionY = -1;

 public List<GameObject> chessmanPrefabs;
 private List<GameObject> activeChessman = new List<GameObject>();

 private void Start()
 {
     SpawnAllChessmans();
 }

 private void Update()
 {
     UpdateSelection();
     DrawChessboard();
 }
 
 private void UpdateSelection()
 {
     if (!Camera.main)
         return;
     RaycastHit hit;
     if(Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 25.0f,LayerMask.GetMask("ChessPlane")))
     {
         selectionX = (int)hit.point.x;
         selectionY = (int)hit.point.z;
     }
     else
     {
         selectionX = -1;
         selectionY = -1;
     }
 }
 
 private void SpawnChessman(int index, Vector3 position)
 {
     GameObject go = Instantiate(chessmanPrefabs [index], position, Quaternion.identity) as GameObject;
     go.transform.SetParent(transform);
     activeChessman.Add(go);
 }

 private SpawnAllChessmans()
 {
     activeChessman = new List<GameObject>();

     //Spawn White Team!

     //King
     SpawnChessman(0, GetTileCenter(3, 0));

     //Queen
     SpawnChessman(1, GetTileCenter(4, 0));

     //Rooks
     SpawnChessman(2, GetTileCenter(4, 0));
     SpawnChessman(2, GetTileCenter(7, 0));

     //Bishops
     SpawnChessman(3, GetTileCenter(2, 0));
     SpawnChessman(3, GetTileCenter(5, 0));

     //Kinghts
     SpawnChessman(4, GetTileCenter(1, 0));
     SpawnChessman(4, GetTileCenter(6, 0));

     //Pawns
     for (int i = 0; i < 8; i++)
         SpawnChessman(5, GetTileCenter(i, 1));
     
 }

 private Vector3 GetTileCenter(int x, int y)
 {
     Vector3 origin = Vector3.zero;
     origin.x += (TILE_SIZE * x) + TILE_OFFSET;
     origin.y += (TILE_SIZE * y) + TILE_OFFSET;
     return origin;
 }

 private void DrawChessboard()
 {
     Vector3 widthLine = Vector3.right * 8;
     Vector3 heightLine = Vector3.forward * 8;


     for (int i=0; i <= 8; i++)
     {
         Vector3 start = Vector3.forward * i;
         Debug.DrawLine(start, start + widthLine);
         for (int j=0; j <= 8; j++)
         {
             start = Vector3.right * j;
             Debug.DrawLine(start, start + heightLine);
         }
     }
     // Draw the selection
     if(selectionX >= 0 && selectionY >=0)
     {
         Debug.DrawLine(Vector3.forward * selectionY + Vector3.right * selectionX, Vector3.forward * (selectionY + 1) + Vector3.right * (selectionX + 1));

         Debug.DrawLine(Vector3.forward * (selectionY + 1) + Vector3.right * selectionX, Vector3.forward * selectionY + Vector3.right * (selectionX + 1));
     }
 }

}