An probably very easy question about Raycast system...

Questions & Answers
1

Hello everyone,

As you guessed I am a new comer about Unity and C#. I could not find a satisfying answer on the internet.

I have an object and I want to cast a ray from my camera to that object (it will have a spesific name) and that must trigger some other event.

What is the best and easy way?

I added a script to my camera like below:

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

public class CameraCastingScript : MonoBehaviour {

public static float DistanceFromTarget;

Camera cam;

void Start()
{
    cam = GetComponent<Camera>();
}

void Update()
{
    Ray ray = cam.ViewportPointToRay(new Vector3(0.5F, 0.5F, 0));
    RaycastHit hit;
    
}

}

And I also added a script to my object like below:

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

public class SkinColorScript : MonoBehaviour {

public float TheDistance;

public GameObject SkinColorText;



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

    TheDistance = CameraCastingScript.DistanceFromTarget;

}

private void OnTriggerEnter (Collider other)
{
    if (other.name == "MyCamera")
    {
        if (TheDistance <= 50)
        {

            SkinColorText.SetActive(true);
        }

        else
        {
            SkinColorText.SetActive(false);
        }
    }

    else
    {
        SkinColorText.SetActive(false);
    }


}

}

I named my camera as “MyCamera”

Thanks for your assistance.

2

Yes exactly that is I want to provide. When ray from the camera hits the object, it deactivates the some other objects.

3

// CameraCastingScript.cs
using UnityEngine;

public class CameraCastingScript : MonoBehaviour
{
    private Camera cam;
    private IInteractionTarget lastTarget;

    void Start()
    {
        cam = GetComponent<Camera>();
    }
    void Update()
    {
        Ray ray = cam.ViewportPointToRay(new Vector3(0.5F, 0.5F, 0));
        RaycastHit hit;

        // If ray hit something
        if( Physics.Raycast( ray, out hit, Mathf.Infinity ))
        {
            // Get component to trigger
            IInteractionTarget target = hit.transform.GetComponent<IInteractionTarget>();

            // If object is close enough to camera, trigger it
            if ( target != null && hit.distance < target.MinimumInteractionDistance )
            {
                if ( lastTarget != null && lastTarget != target ) lastTarget.Trigger( false );
                target.Trigger( true );
                lastTarget = target;
            }
            // If no script found, or object is too far...
            else if ( lastTarget != null )
            {
                lastTarget.Trigger( false );
                lastTarget = null;
            }
        }
        // If no object hit...
        else if ( lastTarget != null )
        {
            lastTarget.Trigger( false );
            lastTarget = null;
        }
    }
}

// IInteractionTarget.cs
public interface IInteractionTarget
{
    float MinimumInteractionDistance { get; }
    void Trigger( bool turnOn );
}

// SkinColorScript.cs
using UnityEngine;

public class SkinColorScript : MonoBehaviour, IInteractionTarget
{
    [SerializeField]
    private float minimumInteractionDistance = 50;

    [SerializeField]
    private GameObject SkinColorText;

    public float MinimumInteractionDistance
    {
        get { return minimumInteractionDistance; }
    }

    public void Trigger( bool turnOn )
    {
        SkinColorText.SetActive( turnOn );
    }
}