Instantiating into a hierarchy

Unity Engine
1

I want to instantiate a prefab so that it becomes a child of the instantiating transform, i.e. attached to it.
Any ides? It’s to be used for things like arrows getting stuck in characters, equipment changes etc.

2 
 newObject = Instantiate(prefab, targetParent.position, targetParent.rotation);
newObject.transform.parent = targetParent;
3

for arrows other projectiles there’s this script as well:

http://forum.unity3d.com/viewtopic.php?t=1597

4

Hey guys,
How do you actually implement this? Heres the snippet from the scripting tutorial mixed with Yoggys bit. Im sure its simple but I havent absorbed this yet.:

 var newObject : Transform; 
function Update () { 
? if (Input.GetButtonDown("Fire1")) { 
?    Instantiate(newObject, transform.position, transform.rotation); 
? 
newObject = Instantiate(prefab, targetParent.position, targetParent.rotation); 
newObject.transform.parent = targetParent; }
 }

So the instantiated prefab needs to parent to the thing it collided with, on collision…
Thanks guys
AC

5

That code won’t work at all for what you are trying to achive.

The first step is to instantiate the projectile when the player shoots.

var projectilePrefab : GameObject;
var gunTransform : Transform;

function Update ()
{
	if(Input.GetButtonDown("Fire1"))
	{
		projectile = Instantiate(projectilePrefab, gunTransform.position, gunTransform.rotation);
		// maybe set some parameter on the projectile like it's velocity if you use
		// rigidbodies for bullets.

		// projectileComponent = projectile.GetComponent(SomeCoolComponent);
		// projectileComponent.awesomeValue = "Something!!!";
	}
}

Then if it were me I would use another script to control the projectile. My favorite method is to use careful raycasts plus whatever else you want your projectile to do.

// this will collide with any collider not on IgnoreRaycast in a ray style fashion.
//If the explosion is directional make sure the "up" direction is (0, 0, 1) or forward.
// if you want the explosion to "bounce" off of the surface add particle velocity on (0, 1, 0) or up.
// to get damage working write a script that has a function called "Damage" that accepts a float parameter for how much damage delt.
//then attach that script to the collider you want to be damageable.
// you can also use multiple damage collider scripts and one damage "reciever" 
// any attached rigidbody of the collider hit will be pushed an amount of hitForce in a "realistic" fashion

var speed = 0.00;
var gravity = 0.00;
var acceleration = 0.00;
var drag = 0.00;
var damage = 0.00;
var hitForce = 0.00;
var explosion : GameObject;

private var velocity : Vector3;
private var hit : RaycastHit;

function Start ()
{
	velocity = transform.forward * speed;
} 

function Update ()
{
	transform.rotation = Quaternion.LookRotation(velocity);

	velocity.y -= gravity * Time.deltaTime;
	velocity -= velocity * drag * Time.deltaTime;
	velocity += transform.forward * acceleration * Time.deltaTime;

	distance = velocity.magnitude * Time.deltaTime;

	if(Physics.Raycast(transform.position, velocity, hit, distance))
	{
		Hit();
	}
}

function Hit ()
{
	transform.position = hit.point;

	other = hit.collider.gameObject;
	other.SendMessage("Damage", damage, SendMessageOptions.DontRequireReceiver);

	if(explosion)
	{
		rotation = Quaternion.LookRotation (hit.normal, transform.forward);
		Instantiate(explosion, hit.point, rotation);

		// alternately to stick the explosion on what it hit:
		// newExplosion = Instantiate(explosion, hit.point, rotation);
		// newExplosion.transform.parent = other.transform;
	}

	// Here is the important part for arrow sticking
	// find a child named "arrow" and stick it in the collider. this "arrow" should be a renderer object.
	arrow = transform.FindChild("arrow");
	if(arrow)
	{
		arrow.parent = other.transform;
	}

	if(hit.rigidbody  !hit.rigidbody.isKinematic) hit.rigidbody.velocity += (-hit.normal + velocity.normalized) * hitForce * 0.5;

	Destroy(gameObject);
}
6

Thanks for the tips. It gave me the clues I needed.