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Question by shepsaus000 · Apr 28, 2016 at 04:22 PM · scripting problemerror

Strangest, but also seemingly important error in Unity that I have seen

So I was just adding some simple OnCollisionEnter functions and all was good in MonoDevelop... until I entered Unity. It was there that I encountered quite possibly the strangest errors I have ever seen! Here they are:

Script error: OnCollisionEnter This message parameter has to be of type: The message will be ignored.

Script error: OnCollisionExit This message parameter has to be of type: The message will be ignored.

That's right, you're reading it correctly. According to Unity, my script is incorrect for my "message parameter" has to be of a nonexistent type!

Of course, that means I did something wrong in my scripts, which makes sense because when I enter play mode, my isColliding boolean is not changing upon colliding with the "Chest" object.

Here is my script in question:

 public GameObject Chest;
 public bool isColliding = false;
 
 void OnCollisionEnter (Collider col){
         if (col.gameObject.CompareTag ("Chest")) {
             isColliding = true;
         }
     }
 
     void OnCollisionExit (Collider col){
         if (col.gameObject.CompareTag ("Chest")) {
             isColliding = false;
         }
     }


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Answer by jgodfrey · Apr 28, 2016 at 04:34 PM

Not sure what's up with the error message, but the problem is simple if you look at the docs here:

http://docs.unity3d.com/ScriptReference/Collider.OnCollisionEnter.html

Here's a snippet from the docs:

In contrast to OnTriggerEnter, OnCollisionEnter is passed the Collision class and not a Collider.

So, this:

 void OnCollisionEnter (Collider col){

Should be:

 void OnCollisionEnter (Collision col){

The same is true of your OnCollisionExit method.

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Answer by Bunny83 · Apr 28, 2016 at 04:37 PM

The OnCollisionXXX methods don't take a "Collider" as parameter but a "Collision". A Collision contains much more information about the collision than just a Collider such as contact points, collision normal, ...

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