Ignore Collision Issues

Alright I made a script to instantiate a projectile when I click and this is what I have now

Code (csharp):

1.  
2. var GrenadeProjectile : Rigidbody;
3. var Velocity = 200;
4.  
5. function Update () {
6.    if (Input.GetButtonDown("Fire2")){
7.        var Grenade : Rigidbody;
8.        
9.        Grenade = Instantiate(GrenadeProjectile, transform.position, transform.rotation);
10.        
11.        Grenade.velocity = transform.TransformDirection (Vector3.forward * Velocity);
12.        
13.        Physics.IgnoreCollision(GrenadeProjectile.collider, transform.root.collider, true);//transform.root.collider);
14.     }
15. }
16.  

However my IgnoreCollision statement doesn't seem to work I get an error message saying "Ignore Collision failed. Both colliders need to be activated when calling this ignore collision" It is between a half cylinder with a mesh collider and an average FirstPersonWalker Prefab everything I tried didn't work whenever I click the projectile explodes instantly obviously because its not ignoring collisions, so what am I doing wrong?
any help would be appreciated, thanks

 

It looks like you are calling ignore collision on your prefab and not the object you just instanced.

 

I understand what your saying but how do you think I should go through fixing it? switching the IgnoreCollision Colliders?

 

You can't call ignorecollision on a prefab, as a prefab by definition is not in your scene. That's why you're getting an error saying you passed it something not active. You want to pass it the collider attached to the game object you spawn, instead of it's non-instanced prefab.

 

Alright I get it, but now I fixed that error I have a new one

NullReferenceException: The prefab you want to instantiate is null.

that is from the instantiated clone e.g

Code (csharp):

1.  
2. var Projectile : Rigidbody;
3. var Velocity = 200;
4.  
5. function Update () {
6.    if (Input.GetButtonDown("Fire2")){
7.        var Clone : Rigidbody;
8.        
9.        Clone = Instantiate(Projectile, transform.position, transform.rotation);
10.        
11.        Clone.velocity = transform.TransformDirection (Vector3.forward * Velocity);
12.        
13.        Physics.IgnoreCollision(Projectile.collider, transform.root.collider);
14.     }
15. }
16.  

Now its saying that the Clone variable is null but I didnt have this problom before...
now what did I do wrong?

 

You didn't drag your prefab to the appropriate variable in the inspector. You also still aren't quite getting the ignore collision thing. You still have the prefab in there.

 

Okay... I'm clueless then :? any help?

 

Code (csharp):

1.       Clone = Instantiate(Projectile, transform.position, transform.rotation);
2.  

If you take a look at the above line where you instance your prefab...

Clone - the new object you create an instance of.
Projectile - the prefab that acts as a template for the object you create.

Code (csharp):

1.  
2. Physics.IgnoreCollision(Projectile.collider, transform.root.collider);
3.  

You're still telling the physics engine to ignore the prefab's collider which obviously doesn't make sense, as the prefab is not part of the scene.

 

Alright I retraced my steps and thanks to your assessment I fixed my mistake however after fixing it a previously working script an explosion script doesn't seem to instantiate the explosion effect on collision the projectile disappears though, but no explosion... It was working before. Here is the script for that component...

Code (csharp):

1.  
2. var Explosion : GameObject;
3.  
4. function OnCollisionEnter( collision : Collision ){
5. var contact : ContactPoint = collision.contacts[0];
6.  
7. var rotation = Quaternion.FromToRotation(Vector3.up, contact.normal);
8. var instantiatedExplosion : GameObject = Instantiate(Explosion, contact.point, rotation);
9.  
10. Destroy( gameObject );
11. }
12.  

if you could help me out one more time?
Thank you for your help before though.

 

Alright I take that back It was instantiating the explosion I just didn't pay enough attention to what was in the variable place... :/ thanks anyways, Quietus