Raycast from GUI Camera possible to only effect gui?

Questions & Answers
1

Hello I’m trying to create a GUI using 3D objects in front of my second Camera(GUI Cam).
I’m using Raycast to determine which object I’m clicking on but I keep getting this Error.

MissingComponentException: There is no ‘Collider’ attached to the “Camera” game object, but a script is trying to access it.
You probably need to add a Collider to the game object “Camera”. Or your script needs to check if the component is attached before using it.

Camera is located away from my scene, and I’m using a script that is supposed to cast a raycast from that camera.

using UnityEngine;
using System.Collections;

public class RaycastGUI : MonoBehaviour
{
    public Camera camToUse;
    // Use this for initialization
    void Start()
    {

    }

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


        if (Input.GetButton("Fire1"))
        {

            Ray ray;
            RaycastHit hit;
            ray = camToUse.ScreenPointToRay(Input.mousePosition);
            if (collider.Raycast(ray, out hit, 100.0f))
            {


                Debug.Log(hit.transform.name);
            }
        }
    }
}

Anyone can pinpoint the problem ?

2

Collider.Raycast is to test against a specific collider in the world, the way you have written it means that the camera would need a collider (and it’s totally not what you want anyway!). What you want to do is put the 3D GUI objects on their own layer and then use a LayerMask in a normal Physics.Raycast to limit what it can hit.