check if raycast hitted object is a certain tag and then do something

Unity Engine
,
1

Hi
i have this script

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

public class DragRigidbody : MonoBehaviour
{
    public float forceAmount = 500;

    Rigidbody selectedRigidbody;
    Camera targetCamera;
    Vector3 originalScreenTargetPosition;
    Vector3 originalRigidbodyPos;
    float selectionDistance;

    // Start is called before the first frame update
    void Start()
    {
        targetCamera = GetComponent<Camera>();
    }

    void Update()
    {
        if (!targetCamera)
            return;

        if (Input.GetMouseButtonDown(0))
        {
            //Check if we are hovering over Rigidbody, if so, select it
            selectedRigidbody = GetRigidbodyFromMouseClick();
        }
        if (Input.GetMouseButtonUp(0) && selectedRigidbody)
        {
            //Release selected Rigidbody if there any
            selectedRigidbody = null;
        }
    }

    void FixedUpdate()
    {
        if (selectedRigidbody)
        {
            Vector3 mousePositionOffset = targetCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, selectionDistance)) - originalScreenTargetPosition;
            selectedRigidbody.velocity = (originalRigidbodyPos + mousePositionOffset - selectedRigidbody.transform.position) * forceAmount * Time.deltaTime;
        }
    }

    Rigidbody GetRigidbodyFromMouseClick()
    {
        RaycastHit hitInfo = new RaycastHit();
        Ray ray = targetCamera.ScreenPointToRay(Input.mousePosition);
        bool hit = Physics.Raycast(ray, out hitInfo, 10.0f);
        if (hit)
        {
            if (hitInfo.collider.gameObject.GetComponent<Rigidbody>())
            {
                selectionDistance = Vector3.Distance(ray.origin, hitInfo.point);
                originalScreenTargetPosition = targetCamera.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, selectionDistance));
                originalRigidbodyPos = hitInfo.collider.transform.position;
                return hitInfo.collider.gameObject.GetComponent<Rigidbody>();
            }
        }

        return null;
    }
}

and on row 52 it says if (hit)
could i somehow change it so if it hits an gameobject with a certain tag it would do something

2

if (hit && hitInfo.collider.gameObject.tag == "my_tag") should do the trick. You can check any number of other conditions as well.

This is very similar to the check on line 54 where you make sure that the object has a RigidBody.

3

You mean like this?

bool hit = Physics.Raycast(ray, out hitInfo, 10.0f);
if (hit && hitInfo.collider.CompareTag("MyTag"))
{
    if (hitInfo.collider.gameObject.GetComponent<Rigidbody>())
    {
    // Do stuff.
    }
}

EDIT: Two identical suggestions at the same time. :slight_smile:

1 Like
4

Yes but “CompareTag” seems like a more Unity way of doing things. Thanks!

1 Like
5

Thank u both so much <3