how to instantiate different objects? how to change orientation on the script of a rigid body?

Unity Engine
1

Hello I’m trying to instantiate 2 objects after a collision, right now I have it set up so that when I press “d” 1 object instantiates, but for the purpose of the game it makes more sense that the instantiation happens after a collision. Right now I only know how to instantiate a single object to which I need to change the orientation of and can’t figure out how to do this in the script because i’m new to c#.

current script is:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class instantiateprefab : MonoBehaviour
{

public GameObject test1;
GameObject test1clone;

void Update()
{
if (Input.GetKeyDown(“d”))

for (int i = 0; i < 1; i++)
{
Rigidbody currentRb;
GameObject test1clone = Instantiate(test1, transform.position, Quaternion.identity) as GameObject;
currentRb = test1clone.AddComponent();

currentRb.detectCollisions = true;
}
}

}

2

Here is how to spawn with collision

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

public class instantiateprefab : MonoBehaviour
{

    public GameObject test1;
    GameObject test1clone;

    void Update()
    {
        if (Input.GetKeyDown("d"))
        {
            SpawnObject();
        }
    }
 
    void SpawnObject()
    {
        for (int i = 0; i < 1; i++) //this for loop is not needed, < 1, means it only runs once.  but if you later want to spawn 5,  then it's good to have it.
        {
            Rigidbody currentRb;
            GameObject test1clone = Instantiate(test1, transform.position, Quaternion.identity) as GameObject;
            currentRb = test1clone.AddComponent<Rigidbody>();
            //change the orientation here
            test1clone.transform.rotation = new Vector3(0,0,0); //  you'll need to play around with this part.
            currentRb.detectCollisions = true;
        }
    }
 
    void OnCollisionEnter(Collision collision)
    {
        Debug.Log("I hit : " + collision.gameObject.name);
        SpawnObject();
    }
 
    void OnCollisionStay(Collision collision)
    {
    }
 
    void OnCollisionExit(Collision collision)
    {
    }

}
1 Like
3

Thanks, this was really helpful. This for loop was added because my plan was to add 2 different objects at the same time after the collision, can you explain the correct way to do this then?

4

by two different, do you mean spawn two different at the same or spawn only one but it changes between the two objects?

1 Like
5

updated to code to spawn multiple gameObject at the same time

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class instantiateprefab : MonoBehaviour
{
    public GameObject[] test1; //this is now an array, so how ever many object you add, it will spawn them all.
    void Update()
    {
        if (Input.GetKeyDown("d"))
        {
            SpawnObject();
        }
    }
    void SpawnObject()
    {
        for (int i = 0; i < test1.Length; i++) //this was updated to use the array
        {
            Rigidbody currentRb;
            GameObject test1clone = Instantiate(test1[i], transform.position, Quaternion.identity) as GameObject; //this line was changed to use the array
            currentRb = test1clone.AddComponent<Rigidbody>();
            //change the orientation here
            test1clone.transform.rotation = new Vector3(0,0,0);
            currentRb.detectCollisions = true;
        }
    }
    void OnCollisionEnter(Collision collision)
    {
        Debug.Log("I hit : " + collision.gameObject.name);
        SpawnObject();
    }
    void OnCollisionStay(Collision collision)
    {
    }
    void OnCollisionExit(Collision collision)
    {
    }
}
1 Like
6

I mean spawning two different game objects like a plate and a cup for example

7

If i want to do this where do I add the other object with name test2 for example would I just change public GameObject[ ] test1, test2;

or more like
public GameObject[ ] test1,
public GameObject[ ] test2;
?

8

The question is really how are going to deside witch gameObject to spawn?
I would do this for randomly spawning them

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class instantiateprefab : MonoBehaviour
{
    public GameObject[] test1; //this is now an array, so how ever many object you add, it will spawn them all.
    public GameObject[] test2;
   
    void Update()
    {
        if (Input.GetKeyDown("d"))
        {
            SpawnObject(test1);
        }
    }
    void SpawnObject(GameObject[] SpawnList)
    {
        for (int i = 0; i < SpawnList.Length; i++) //this was updated to use the array
        {
            Rigidbody currentRb;
            GameObject test1clone = Instantiate(SpawnList[i], transform.position, Quaternion.identity) as GameObject; //this line was changed to use the array
            currentRb = test1clone.AddComponent<Rigidbody>();
            //change the orientation here
            test1clone.transform.rotation = new Vector3(0,0,0);
            currentRb.detectCollisions = true;
        }
    }
    void OnCollisionEnter(Collision collision)
    {
        Debug.Log("I hit : " + collision.gameObject.name);
        int rand = Random.Range(0, 10);
       
        if(rand > 4)
        {
            SpawnObject(test1);
        }else
        {
            SpawnObject(test2);
        }
    }
    void OnCollisionStay(Collision collision)
    {
    }
    void OnCollisionExit(Collision collision)
    {
    }
}
1 Like
9

test1clone.transform.rotation = new Vector3(0,0,0);

i’m getting an error on this line

10

Do you know how I can fix this?

11

Try this
test1clone.transform.Rotate(Vector3.right);

12

I tried to run this code, but now when i press d nothing happens

13

no errors? no null refs?

14

none that I saw