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2

The title kind of says it all. Is it possible to replace C# with C++ on a game using Unity?

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It is if you have the Pro edition. For more information see: docs.unity3d.com/Manual/Plugins.html – Ascendion Aug 27 '14 at 3:12

2 Answers 2

up vote 17 down vote accepted

It is possible to use C++ with the Free version of Unity, although it is easier to work with if you have a Unity Pro license. All you have to do is wrap it up in a DLL and follow the instructions below on where to place it.

I wrote an article that covers this topic: Unity and DLLs: C# (managed) and C++ (unmanaged)

For Unity 4 Free:

  • Add unmanaged code to the Unity Project Root: UnityProject
  • Add managed code to the Plugins folder: UnityProject->Plugins
  • When you build a project, copy the unmanaged code to BuildRoot->Data->Plugins

For Unity 4 Pro and any Unity 5:

  • Just copy the DLLs into UnityProject->Plugins

Unmanaged means C++ and Managed means C#

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1  
Has this changed for Unity 5 where the free version contains all of the engine features of the pro version? – GeekyMonkey Mar 4 at 12:33
1  
@GeekyMonkey Updated the article and answer. – MLM Mar 4 at 18:55
    
Thanks for that. Great news. – GeekyMonkey Mar 5 at 22:47
    
It makes no sense to try to replace C# with C++ in the Unity3D context. This answer may be helpful if interfacing with native code was asked for. – Code Clown Jun 24 at 10:42
    
With the new IL2C++ technology, there aren't many reasons to use C++ instead of C#. Right now, it's limited to mobile platforms but expect the tech to soon be available on PC. – JPtheK9 Jul 4 at 8:03
up vote 2 down vote

It is possible though inconvenient. You'd have to write managed C++ to achieve it. And yes, there is such thing as managed C++. Managed doesn't specifically mean C# and unmanaged C++. To achieve it you'll need to import UnityEngine DLL file. When you're finished you put it in the (Unity Project Name)/Plugins folder. Here would be the code you'd use: In the C++ file:

public ref class CPPUNITY {
  public:
     void Start() {
         Debug::Log("C++ printed message");
     }

};

In the C# file:

     using UnityEngine;
     public class FileName {
         void Start() {
              CPPUNITY.Start();
         }
     }

That exact code wouldn't work but thats a base.

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