• Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
  • Asset Store
  • Get Unity

UNITY ACCOUNT

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account
  • Blog
  • Forums
  • Answers
  • Evangelists
  • User Groups
  • Beta Program
  • Advisory Panel

Navigation

  • Home
  • Products
  • Solutions
  • Made with Unity
  • Learning
  • Support & Services
  • Community
    • Blog
    • Forums
    • Answers
    • Evangelists
    • User Groups
    • Beta Program
    • Advisory Panel

Unity account

You need a Unity Account to shop in the Online and Asset Stores, participate in the Unity Community and manage your license portfolio. Login Create account

Language

  • Chinese
  • Spanish
  • Japanese
  • Korean
  • Portuguese
  • Ask a question
  • Spaces
    • Default
    • Help Room
    • META
    • Moderators
    • Topics
    • Questions
    • Users
    • Badges
  • Home /
avatar image
Question by Luvs2Dummy · Feb 14, 2014 at 03:26 PM · gameobjecttransformprefabtarget

Assign a 'Transform' target to prefab by finding a 'GameObject'

I've read through other posts, and I know what needs to be done, I just can't find a way to do it. I'm pretty new to unity and game programming in general.

I have a 'Transform' object that is being used to calculate prefabbed enemy's angle of rotation and direction of travel. I can't seem to find a way to assign the target through scripting.

 enter code using UnityEngine;
 using System.Collections;
 
 public class seekTarget : MonoBehaviour {
     
     public Transform target;
     public float speed;
     public float moveSpeed;
     public float moveStep;
     public float range;
     public float distance;
 
     void Update() {
 
         Vector3 dir = target.position - transform.position;
         float angle = Mathf.Atan2(dir.y,dir.x) * Mathf.Rad2Deg;
         transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
 
         float moveStep = moveSpeed * Time.deltaTime;
         distance = Vector3.Distance (target.position, transform.position);
 
         if (distance > range) 
         {
             transform.position = Vector3.MoveTowards (transform.position, target.position, moveStep);
         }
 
     }
 
 }

I've tried using the GameObject.FindGameObjectByTag("Player"); line, but when I try that it says I can't convert from 'Transform' to 'GameObject'

When I try to make the 'target' a 'GameObject' from the start, none of my vector functions will work.

I've tried explicitly typecasting as well, to no avail.

What am I missing?

Comment
SahanD

People who like this

1 Show 0
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users

1 Reply

  • Sort: 
avatar image

Answer by robertbu · Feb 14, 2014 at 03:29 PM

If you are absolutely sure that at least one of the 'Player' tagged objects exist in the scene, you can do:

 target = GameObject.FindGameObjectByTag("Player").transform;

Getting something by tag is efficient enough to do every frame, but if the 'Player' tagged object never changes to a new game object it would best to do the assignment in Start().

If there is a chance that the 'Player' game object will not exist, you can do:

 GameObject go =  GameObject.FindGameObjectByTag("Player");
 if (go != null) {
     target = go.transform;
 }
 else {
     target = null;
 }

But if you need to handle this situation, you also need to handle target being null in the rest of your code.

Comment
gonzalocastillocabrera

People who like this

1 Show 1 · Share
10 |3000 characters needed characters left characters exceeded
▼
  • Viewable by all users
  • Viewable by moderators
  • Viewable by moderators and the original poster
  • Advanced visibility
Viewable by all users
avatar image Luvs2Dummy · Feb 14, 2014 at 04:28 PM 0
Share

Of course, I was missing something as simple as '.transform' .. Thank you, kind stranger!

Unity Answers is in Read-Only mode

Unity Answers content will be migrated to a new Community platform and we are aiming to launch a public beta by June 9. Please note, Unity Answers is now in read-only so we can prepare for the final data migration.

For more information and updates, please read our full announcement thread in the Unity Forum.

Follow this Question

Answers Answers and Comments

18 People are following this question.

avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image avatar image

Related Questions

How to create GameObject without adding it to scene? 1 Answer

Project Prefabs 1 Answer

Acessing scripts in other game objects with prefabs, without using GameObject.Find 1 Answer

Nested Prefab Issue 0 Answers

Adding a prefab to gameObject at a certain position in runtime 0 Answers


Enterprise
Social Q&A

Social
Subscribe on YouTube social-youtube Follow on LinkedIn social-linkedin Follow on Twitter social-twitter Follow on Facebook social-facebook Follow on Instagram social-instagram

Footer

  • Purchase
    • Products
    • Subscription
    • Asset Store
    • Unity Gear
    • Resellers
  • Education
    • Students
    • Educators
    • Certification
    • Learn
    • Center of Excellence
  • Download
    • Unity
    • Beta Program
  • Unity Labs
    • Labs
    • Publications
  • Resources
    • Learn platform
    • Community
    • Documentation
    • Unity QA
    • FAQ
    • Services Status
    • Connect
  • About Unity
    • About Us
    • Blog
    • Events
    • Careers
    • Contact
    • Press
    • Partners
    • Affiliates
    • Security
Copyright © 2020 Unity Technologies
  • Legal
  • Privacy Policy
  • Cookies
  • Do Not Sell My Personal Information
  • Cookies Settings
"Unity", Unity logos, and other Unity trademarks are trademarks or registered trademarks of Unity Technologies or its affiliates in the U.S. and elsewhere (more info here). Other names or brands are trademarks of their respective owners.
  • Anonymous
  • Sign in
  • Create
  • Ask a question
  • Spaces
  • Default
  • Help Room
  • META
  • Moderators
  • Explore
  • Topics
  • Questions
  • Users
  • Badges