How to get the position of a gameobject every frame?-CodePudding

I basically want to make a gameobject turn around after it reaches a certain position in space. I have a prefab, create the gameobject and make it move randomly. However, printing the position value gives me the same value (0,4,0) which is basically the spawners location. I want the location of the object while its moving through space. Here is the code:

If (Input.GetMouseButtonDown(0))
{
  direction = new Vector3(Random.Range(-1.0f,1.0f), Random.Range(-1.0f,1.0f),     Random.Range(-1.0f,1.0f)); 
 GameObject sphere = Instantiate(spherePrefab, transform.position, Quaternion.identity);
 sphere.GetComponent<Rigidbody>().velocity = direction * speed; // this moves the object randomly
 position = sphere.transform.position;
 Debug.Log(position); // This prints the spawners location every frame but no the spheres.

I have only created a spawner object in the scene and just instantiate the spheres with my script.

Any help appreciated!

CodePudding user response：

You're not updating the value you're printing in your log.

The position variable only holds the world position of the prefab at the moment it is instantiated.

Here is a basic script based on your code which gives the world position as you would expect it.

Below, spherePrefab is a 3D game object sphere on which I've only added a Rigidbody with default parameters.

Use case is as follows : Press the mouse button down, then watch the Unity console.

using UnityEngine;

public class Test : MonoBehaviour
{
    [SerializeField] GameObject spherePrefab;

    const float SPEED = 2f;

    // Initialization
    Vector3 _sphere_position = Vector3.zero;
    bool _display_log = false;
    GameObject _sphere_ref = null;

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            Vector3 direction = new(Random.Range(-1.0f, 1.0f), Random.Range(-1.0f, 1.0f), Random.Range(-1.0f, 1.0f));

            _sphere_ref = Instantiate(spherePrefab, transform.position, Quaternion.identity);
            _sphere_ref.GetComponent<Rigidbody>().velocity = direction * SPEED; // this moves the object randomly
            _sphere_position = _sphere_ref.transform.position;

            Debug.Log(_sphere_position); // This prints the spawners location every frame but no the spheres.

            _display_log = true;
        }

        // This case is expected to be entered after setting sphere_ref in order not to be null
        if (_display_log)
        {
            // Update the value
            _sphere_position = _sphere_ref.transform.position;

            // Print it
            Debug.Log(_sphere_position);
        }
    }
}