Adding New Overloads For Unity Libraries Such as Physics.RayCast()

So I was wondering if anyone knew how to add new overloads to methods that are built into Unity. I have never tried to do anything with dll so going in pretty blind here.

I was wanting to create new methods for Physics2D.Raycast() that I would find some use for.
For starters I tried importing the DLL using System.Runtime.InteropServices than overloading the Raycast method using
Public extern static bool.

Code (CSharp):

1. using System.Runtime.InteropServices;
2.  
3. namespace UnityEngine
4. {
5.    
6.     public class Physics2DExtended : Physics2D
7.     {
8.  
9.         [DllImport("Assets/Plug-ins/UnityEngine.Physics2DModule.dll")]
10.         public extern static bool Raycast(Vector2 origin, Vector2 direction, out RaycastHit2D hitInfo, float maxDistance);
11.  
12.     }
13. }

I was able to read the DLL correctly, but I got an error with as much as I looked around couldn't find a nice fix that worked for me. I found several forums that talked about fixes, but none of them worked.

The error was



Player Interaction is where I was trying to call the new method I created. I have the dll in the project folder so not sure what to do after trying this.

Anyone that could help this noob out would be very much loved.

 

Fundamentally, you don't. If you want to create your own versions of things, then just make your own class.

What kind of uses?

 

You can write an extension class, that does what you want.

Code (CSharp):

1. public static class MyPhysics{
2.      public static void Raycast2D(...) {
3.          // Do what you want
4.          ....
5.      }
6. }

Then call it via MyPhysics.Raycast2D(...);
No need to hack stuff