Raycast problem

Questions & Answers
1

Here is my Player Collisions script:

using UnityEngine;
using System.Collections;

public class PlayerCollisions : MonoBehaviour {
    GameObject currentDoor;

    void Update () {
        RaycastHit hit;
        if(Physics.Raycast (transform.position, transform.forward, out hit, 3)) {
            if(hit.collider.gameObject.tag == "playerdoor") {
                currentDoor= hit.collider.gameObject;
                currentDoor.SendMessage ("DoorCheck");
            }
        }
    }

And this Door Manager script:

using UnityEngine;
using System.Collections;

public class DoorManager : MonoBehaviour {
    bool doorIsOpen = false;
    float doorTimer = 0.0f;
    public float doorOpenTime = 3.0f;
    public AudioClip doorOpenSound;
    public AudioClip doorShutSound;

    // Use this for initialization
    void Start () {
        doorTimer = 0.0f;

    }

    // Update is called once per frame
    void Update () {
        if(doorIsOpen){
            doorTimer += Time.deltaTime;
            if(doorTimer > doorOpenTime){
                Door(doorShutSound, false, "doorshut");
                doorTimer = 0.0f; 
            }
        }
    }
    void DoorCheck(){
        if(!doorIsOpen){
            Door(doorOpenSound,true, "dooropen");
        }
    }
    void Door(AudioClip aClip, bool openCheck, string animName){
        audio.PlayOneShot(aClip);
        doorIsOpen = openCheck;
        transform.parent.gameObject.animation.Play(animName);
    }
}
2

On advising the OP to place Debug.Log("raycast hit tag : " + hit.collider.gameObject.tag); after if (Physics.RayCast …etc… , it is noticeable that the Debug is returning playerDoor , but your tag check is playerdoor : note the capitol D in Door =]

The naming is case-sensitive. Simply change if(hit.collider.gameObject.tag == “playerdoor”) { to

if(hit.collider.gameObject.tag == "playerDoor") {