Rotate the Object 90 Degrees

Questions & Answers
1

I have been looking around but can’t find how to say rotate a object to instantiate so say I hit the left and right arrow keys to move the object say like 90 degrees so that it goes from a wall facing one way to the other. For example building a square house requires the object be rotated…

So the wall needs to go from this - to this |
Here is the code…

using UnityEngine;
using System.Collections;

public class Placement : MonoBehaviour
{
	public bool objectplace = false, newobjectselected = false;
	public GameObject block;
	private int permanentLayer = 20;
	private GameObject nextToPlace;
	
	void Update ()
	{
		if(objectplace == true)
		{
			Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        	RaycastHit hit;

			if (Physics.Raycast(ray, out hit, 14, 1 << permanentLayer))
			{
  				float snap = 0.25f;
				Vector3 snapped = new Vector3(Mathf.RoundToInt(hit.point.x/snap)*snap, Mathf.RoundToInt(hit.point.y/snap)*snap, Mathf.RoundToInt(hit.point.z/snap)*snap);
				nextToPlace.transform.position = snapped;
				if(Input.GetKeyDown("right"))
				{
					nextToPlace.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
				}
  				nextToPlace.SetActive(true);
  				if (Input.GetButtonDown("Fire1"))
  				{
    				nextToPlace.layer = permanentLayer; // place it, so we can put things on top
    				// get a new one:
    				nextToPlace = Instantiate(block, Vector3.zero, Quaternion.identity) as GameObject;
    				nextToPlace.SetActive(false);
    				objectplace = false;
  				}
			}
			else
			{
  				nextToPlace.SetActive(false);
			}
		}
	}

	void LateUpdate()
	{
		if(newobjectselected == true)
		{
			Destroy(nextToPlace);
			nextToPlace = Instantiate(block, Vector3.zero, Quaternion.identity) as GameObject;
			nextToPlace.SetActive(false);
			newobjectselected = false;
		}
	}
}
2

object.transform.rotate(0,90,0);