Install the CSHARP module

This is an optional module that adds C# support in Chrono.


The CSHARP module allows users to use Chrono in C# programs and interface Chrono to engines such as Unity3D.


  • To build this module:
    • you must have the SWIG wrapper generator installed. On the Mac type brew install swig.
Chrono::Csharp requires SWIG version 4.0.0* or newer. On the Mac **SWIG v. 4.0.1 is known to work. It is installed by homebrew.

Building instructions

  1. Install SWIG on your system. Version 4.0.0 or newer is required. (on Windows, just unzip where you want).
  2. Repeat the instructions for the full installation, but when you see the CMake window, you must add the following steps:
  3. Set the ENABLE_MODULE_CSHARP as 'on', then press 'Configure' (to refresh the variable list)
  4. When you pressed 'Configure', CMake should have detected your SWIG tools. This should create two variables in CMake called SWIG_DIR and SWIG_EXECUTABLE. If all is fine, they should automatically contain meaningful values, for example C:/swigwin-4.0.0/Lib and C:/swigwin-4.0.0/swig.exe , so you do not need to touch them. (On Windows, you may need to set them by hand).
  5. Press 'Configure' again, then 'Generate', and proceed as usual in the installation instructions.


The build process of the Csharp modules, as generated by CMake, consists of these automatic steps:

  • SWIG preprocesses C++ source code files in order to generate .cxx wrapper files that contain the code for accessing C++ functions through the API, and (several hundreds) .cs files. These C# files are all generated in a subdirectory chrono_csharp of the BUILD tree.
  • the C++ compiler compiles the .cxx file and generates one or more library files. On Windows, the DLL library files are created in the bin/<Configuration> directory of the BUILD tree. On Linux, the .so shared libraries are created in the lib directory of the BUILD tree.
  • the SWIG-generated files (.cs) and resulting library files (.dll on Windows and .so on Linux/Mac) are generated and can be used from the above locations in the BUILD tree. Similarly, after installation, all Chrono::Csharp files are copied in two separate locations of the INSTALL tree (C# files under include/chrono_csharp and libraries files under bin or lib on Windows and Linux, respectively).
Note that the SWIG tool requires a few minutes to process the source and generate the .cxx wrapper file. When you start the compilation of the entire Chrono project, the process might look 'frozen' for one or two minutes when SWIG does its job.