You can't do that exactly since the unity components are final and do not let you use inheritance and extend their capabilities.
You can do one of 2 things:
1) Use a prefab
- Create a game object.
- Attach the rigidbody component to it.
- Create a prefab in the Project window (right click mouse -> Create -> Prefab).
- Drag the game object you've created on to the prefab you created.
- Change the settings of the rigidbody on the prefab (not on the game object!).
- Drag as many instances of this prefab to the hierarchy pane to create game objects that are copy of the prefab.
- Now each time you change the prefab - the change effects all the instances of it which you have created.
- Note: each setting you change on a game object which is connected to a prefab (was created from it), will not effect the other objects or the prefab (although in the GameObject menu you can select "Apply changes to prefab" when you have such a game object selected in order to... Apply those settings to the Master prefab.
2) Create a script that requires the component you wish to have defaults for and change the settings of the component you need during run time, like this (give a meaningful name to the script e.g. "RigidBodyExtended")
@script RequireComponent(Rigidbody)
// Duplicate any setting you wish to be able to change in run time
public var useGravity = false;
private var rigidBody : Rigidbody;
function Awake()
{
// Grap the reference to the rigidbody
rigidBody = GetComponent(Rigidbody);
// Now you can use your own setting
rigidBody.useGravity = useGravity;
}
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