Ignoring collisions between a prefab and a child collider (cannot get it to work)

Hi all,

I'm having an issue with ignoring collisions on two objects with Physics.IgnoreCollision.

I have a player ship that can pickup bombs and then drop them again.

When I drop the bomb I want the child collider (bottom of ship) to temporarily ignore the bomb collider (which is attached under the ship after picking it up).

In Void Start() I loop through the Player ship colliders and find the child I want and assign this a reference:

Code (CSharp):

1. colliders = GetComponentsInChildren<Collider>();
2.         foreach (Collider col in colliders)
3.         {
4.             if (col.name == "BottomCollider")
5.             {
6.                 shipBottomCollider = col;
7.             }
8.         }

Once the player has the bomb picked up, the B key can be pressed to drop the bomb, and it's here I want to ignore the collisions between the bomb and the ship. When the B key is pressed the bomb drops momentarily the attaches itself to the player ship again:

Code (CSharp):

1. private void DropBomb()
2.     {
3.         if(Input.GetKeyDown(KeyCode.B))
4.         {
5.             if (hasBomb)
6.             {
7.                 bombDummy.SetActive(false);
8.                 GameObject bombDrop = Instantiate(bombPrefab, bombDummy.transform.position, bombDummy.transform.rotation);        
9.                 uiManager.RemoveBombs(1);
10.                 Physics.IgnoreCollision(bombDrop.GetComponent<Collider>(), shipBottomCollider);      
11.                 hasBomb = false;
12.             }
13.             else
14.             {
15.                 //play empty bomb slot
16.             }
17.            
18.         }
19.     }
20.  

Any pointers greatly appreciated!

 

Got it sorted, so for anyone else who has this issue, I changed ‘GameObject bombDrop’ to ‘Transform bombDrop’ and added ‘as Transform’ at the end of the instantiate line.

 

If you don't want the bombs to collision later, you can adjust it in the `ProjectSettings/Physics/LayerCollisionMatrix` settings.

 

Thanks for the tip, I actually only want to ignore the collisions temporarily so I've added an Invoke with IgnoreCollison set to False after one second. This way the ship can pick the bomb up again after its been dropped.

Cheers