Yet another script error

Physics
1

I am trying to make a script that changes on the fly the mesh collider to be convex.

Here is my attempt:

rigidbody.Sleep();

rigidbody.mass = 0.5;

public var MeshCollider;
	MeshCollider.convex = true;
	
function OnCollisionEnter(collision : Collision) {
if (collision.rigidbody)
	Destroy (rigidbody);
}

Here are the errors I recieve:
NullReferenceException: Object reference not set to an instance of an object
Boo.Lang.Runtime.RuntimeServices.Dispatch (System.Object target, System.String cacheKeyName, System.Type[ ] cacheKeyTypes, System.Object[ ] args, Boo.Lang.Runtime.DispatcherFactory factory) [0x00000]
Boo.Lang.Runtime.RuntimeServices.Dispatch (System.Object target, System.String cacheKeyName, System.Object[ ] args, Boo.Lang.Runtime.DispatcherFactory factory) [0x00000]
Boo.Lang.Runtime.RuntimeServices.SetProperty (System.Object target, System.String name, System.Object value)
MassConvex-Crack.Main () (at Assets\Scripts\2D\Physics\MassConvex-Crack.js:6)

They all relate back to that script.

Any help would be greatly appreciated.

2

It’s exactly what the error says, your object is not set to anything, it is null. Just declaring the variable MeshCollider doesn’t fill it with anything.

// This means you can't place the script on an object that doesn't have a mesh collider component, which should help with future accidental errors
@script RequireComponent(MeshCollider)
// Note that using the Capitilised name will actually refer to the type, not the variable.
public var meshCollider : MeshCollider;
function Start()
{
  meshCollider = GetComponent(MeshCollider);
  meshCollider.convex = true;
}

That should remove your error, however I’m not sure that changing it at runtime is the best move performance wise. Give it a go though, I’ve never really tried it.

3

As you can see I am still a newbie at scripting. I have about 500 objects that need to be set convex, I noticed that selecting all of them in the inspector and changing them to convex does not work, since it only does one. That’s why I turned to scripting because it can be batch applied.

Unless there’s an alternative to changing each one individually I’ll stick with scripting.

I forgot to remove the Destroy Rigidbody section before I posted.

Thanks for the help :slight_smile:

4

I suppose if you just call it during the Start or Awake functions it should be alright. You could also write a quick editor script that does the batch for you, then you could just do it once in the editor and not have extended load times.

5

I’ll have to look into that. Does it work with the trial?

6

It should. Check out the editor classes here in the documentation. It’s quite easy to get a custom window up and add a few buttons to handle your own functions.