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Question by Picatti · May 21, 2016 at 06:07 PM · unity 5movementbulletworkcat

Why does this code dont work

I want to create an object and make him move forward like the classic bullet

using UnityEngine; using System.Collections;

public class shooting : MonoBehaviour { public GameObject cat; public bool create = false; public float speed = 180;

 // Use this for initialization
 void Start () {

 }

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

     if (Input.GetMouseButtonDown(0)) {

         Instantiate(cat,transform.position, Quaternion.identity);
         cat.AddComponent<Rigidbody>();
         Rigidbody cat_rigidbody = cat.GetComponent<Rigidbody>();
         cat_rigidbody.AddForce(transform.forward * speed * Time.deltaTime);
         Destroy(cat,10.0f);

     }
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Answer by JedBeryll · May 21, 2016 at 06:30 PM

Because you try to move the original object.

 Instantiate(cat,transform.position, Quaternion.identity);

The above code returns the instance but you don't save it and you don't move it. Instead you move the original "cat". You could do:

 GameObject newCat = Instantiate(cat,transform.position, Quaternion.identity);

and then add the rigidbody to the newCat. By the way, AddComponent also returns the added component so you can do this in one line like this:

  Rigidbody cat_rigidbody = cat.AddComponent<Rigidbody>();
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avatar image Picatti · May 21, 2016 at 08:20 PM 1
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Ok sorry, it works! THAN$$anonymous$$S

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Answer by Picatti · May 21, 2016 at 08:13 PM

void Update () {

     if (Input.GetMouseButtonDown(0)) {

         GameObject newcat = Instantiate(cat,transform.position, Quaternion.identity);
         Rigidbody cat_rigidbody = newcat.Add.Component<Rigidbody>();
         cat_rigidbody.AddForce(transform.forward * speed * Time.deltaTime);
         Destroy(cat,10.0f);

     }

it doesn't work :(

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avatar image JedBeryll · May 22, 2016 at 05:37 AM 0
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AddForce takes another parameter. By default it's "Force" which would work if you applied it continouosly, give it an "Impulse" or "VelocityChange". http://docs.unity3d.com/ScriptReference/Force$$anonymous$$ode.html

 cat_rigidbody.AddForce(transform.forward * speed * Time.deltaTime, Force$$anonymous$$ode.Impulse);

Also at the end, you probably want to destroy the newCat not the original.

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