I want to setup a raycast that is going forward from my character that allows me to left click on a cube with the tag "npc" and open up a gui window (in C#)

Questions & Answers
1

This is for a third person camera view from behind the character/over the shoulder.
My raycast is supposed to be aimed forward from my character at about mid height so that if I come across a merchant I can left click on him and it will ignore my character and check whether the npc is a certain distance from me and whether it possesses the tag “npc” which will open up the gui window with all the goods to sell.

there are still a few variables floating around in this script because i’m still editing :P.

any help would be appreciated.

using UnityEngine;
using System.Collections;

public class ClickHandler : MonoBehaviour {

	public Transform playerTarget;
	public Transform activateRange;
	public float chatDist;
	public string tagCheck = "Npc";
	bool checkAllTags = false;
	public Texture2D chatBG;
	public Texture2D shopBG;
	public bool foundHit;
	public bool shop = false;
	public bool endShop = false;
	public bool talking = false;
	public TextAsset dialogueText;
	string displayText;
	public GUIStyle textStyle = new GUIStyle();
		
	// Use this for initialization
	void Start () {
		foundHit = false;
		checkAllTags = false;
		talking = false;
		displayText = dialogueText.text;
		textStyle.fontSize = Screen.height / 60;
		textStyle.normal.textColor = Color.white;
	}

	
	// Update is called once per frame
	void Update () {

		RaycastHit hit;

		if (Input.GetMouseButtonDown(0)) {
			foundHit = Physics.Raycast (playerTarget.transform.position, activateRange.transform.position, out hit);
				
				if (foundHit && hit.transform.tag != "npc") {
					foundHit = false;
				}
				if (foundHit && hit.transform.tag == "npc") {
					talking = !talking;
				}
		}
	}

		
		
	void OnGUI(){
		if (talking == true) {

			GUI.DrawTexture (new Rect(Screen.width/2 - Screen.width / 4, Screen.height / 11, Screen.width / 5, Screen.height / 3), chatBG);

			GUI.Box (new Rect(Screen.width / 4 + Screen.width / 60, Screen.height / 8, Screen.width / 5, Screen.height / 4), displayText, textStyle);

			GUI.Button (new Rect(Screen.width / 2 - Screen.width / 5 - Screen.width / 30, Screen.height / 2 - Screen.height / 7, Screen.width / 14, Screen.height / 32), "Thankyou!");

			if (GUI.Button (new Rect(Screen.width / 2 - Screen.width / 7 + Screen.width / 150, Screen.height / 2 - Screen.height / 7, Screen.width / 14, Screen.height / 32), "Go to hell!")) {
					talking = false;
			}
		}
	}
}

what I have found is that i go into game and i move back a rather far distance and it finally checks the foundHit but wont activate foundHit if i’m any closer or further.
another thing I’ve noticed is that the hit.transform.tag == “npc” isn’t picking up the object tag.

2

not even gonna read the code here because I am novice (or lazy). but wouldnt a trigger sphere around the merchant be a better idea? like when you walk inside of it… you can click it…

like this script could be attached to the merchant

var clickable : boolean;

function OnTriggerStay3D(other : Collider3D)
{
   if(other.gameObject.tag=="Player")
   {
   clickable == "true";
   }
   else
   {
   clickable == "false";
   }
}

function OnMouseDown()
{
if(clickable == "true")
 {
 //open gui window
 }
}

function Update()
{
if(clickable == "false")
 {
 //close gui window
 }
}

alot less code :wink:

sry for any syntax mistakes I might have made

3

This should do the trick: It offsets both origin and target vector of the ray by 0.5 upwards.

foundHit = Physics.Raycast (playerTarget.transform.position + Vector3.up * 0.5f, playerTarget.transform.forward + playerTarget.transform.position.up * 0.5f, out hit);