TLDR:
1. problem: If I **instantiate prefabs** **into a variable** (array), the **resulting objects have no gravity** and won't be affected by force (when throwing them they just stop the moment I release them). If I Instantiate them without a reference on them they work fine. why?
2. problem: Asking for a specific **Tag in an if-clause won't work**. Why?
3. (understanding) problem: **OnTriggerEnter is executed** when 2 objects collide and **none of their colliders is marked as Trigger**. Why?
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I am a teacher and creating a little game for learning maths. It's about geometric solids. I use VRTK 4 Tilia for a System of Interactables and SnapZones. The current target for me is to get working, that I can spawn as many geometric solids (cylinder, wedge and cube) by dragging them out of a special SnapZone at the right side and to be able to stack those in a field of SnapZones, the "game field" of these zones. The Colliders of the SnapZones are Triggers, the colliders of the Interactables aren't.
2nd problem I have with ALL interactables (wedges, cubes and cylinders): I want those to snap in in the orientation, in which I drop them into the snapzone. Because of that, I wrote the following script named CopyRotationToCollidingObject:
private void OnTriggerEnter(Collider other)
{
//if (!other.CompareTag("Interactable") && !other.gameObject.CompareTag("Interactable"))
if(other.transform.parent.CompareTag("SnapZone"))
{
Quaternion rot = new Quaternion();
rot.w = this.gameObject.transform.rotation.w;
rot.x = this.gameObject.transform.rotation.x;
rot.y = this.gameObject.transform.rotation.y;
rot.z = this.gameObject.transform.rotation.z;
Vector3 angles = rot.eulerAngles;
angles.x = RoundMe(angles.x);
angles.y = RoundMe(angles.y);
angles.z = RoundMe(angles.z);
rot = Quaternion.Euler(angles);
other.gameObject.transform.parent.gameObject.transform.rotation = rot;
}
This generally works, when touching a SnapZone its orientation is changed, so that the snapped Interactable also is oriented in the right way. The problem with this is, that if I use the if-clause this way, nothing happens at all. If I use it the way that is commented out, the Interactables also switch the orientation of each other if they hit. The weired thing ist that if I Debug.Log exactly those tags before the if-clause, they say "Interactable" and "SnapZone", which is how I tagged the prefabs they come from. What am I doing wrong here? For my understanding this shouldn't be triggered at all when Interactables collide anywaay, cause none of their colliders are triggers (3rd problem). As a workaround with the following code I tried to delete the script from interactables when they are snapped to avoid the behaviour at least then, but it did NOTHING but actiating/deactivation the object toBeActivated, activate() is always called when an Interactable is snapped into a snapzone, deactivate() when an Interactable is unsnapped.
public void activate()
{
toBeActivated.SetActive(true);
Destroy(configurator.SnappedInteractable.GetComponent());
}
public void deactivate()
{
configurator.SnappedInteractable.AddComponent();
toBeActivated.SetActive(false);
}
1st problem:
The prefabs I have in the beginning in the scene work perfectly (despite from problem #1). But when I instantiate new ones with the following class, I get weired problems: I can drag them out of the special spawn SnapZone, and immediately a new one is spawned that is snapped in that special spawn SnapZone. But then the one I just dragged out has no gravity!
public class PrefabGenerator : MonoBehaviour
{
public int limit=200;
[Tooltip("A Transform, which position (world space) is copied to the new instance of the prefab.")]
public Transform optionalSpawn;
public GameObject myPrefab;
[HideInInspector]
public static GameObject[] instances;
[HideInInspector]
public static int instanceCount = 0;
private void Start()
{
instances = new GameObject[limit];
}
public void generatePrefab()
{
if (optionalSpawn != null)
{
x = optionalSpawn.position.x;
y = optionalSpawn.position.y;
z = optionalSpawn.position.z;
}
if (instances[instanceCount] == null)
{
instances[instanceCount] = Instantiate(myPrefab, new Vector3(x, y, z), Quaternion.identity);
instances[instanceCount].transform.localScale = new Vector3(0.08f, 0.08f, 0.08f);
instanceCount++;
}
}
The prefab generator script is attached to the corresponding snap zone (there is one for each kind of geometric solid), so that the Start-routine is only executed at the start and not with each spawn.
Why don't I have gravity on all during runtime created objects? Somehow this happens when I assign the Instantiation to a variable, but I need to do this to relocate them and let them snap into the SnapZone at spawn!
I hope you can help me!
Julian
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