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carla/Docs/how_to_build_on_windows.md

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Windows build

* [__Requirements__](#requirements): * System specifics * [__Necessary software__](#necessary-software): * Minor installations: CMake, git, make, Python3 x64 * Visual Studio 2017 * Unreal Engine 4.22 * [__CARLA build__](#carla-build): * Clone repository * Get assets * make CARLA

The build process can be quite long and tedious. This documentation tries to make things clear and provides for a F.A.Q. with solutions for the most common starting issues. However, the CARLA forum is open for anybody to post unexpected issues, doubts or suggestions. There is a specific section for installation issues on Windows. Feel free to login and become part of the community.

--- ##Requirements

System specifics

  • x64 system: The simulator should run in any Windows system currently available as long as it is a 64 bits OS.
  • 30GB disk space: Installing all the software needed and CARLA itself will require quite a lot of space, especially Unreal Engine. Make sure to have around 30/50GB of free disk space.
  • An adequate GPU: CARLA aims for realistic simulations, so the server needs at least a 4GB GPU. A dedicated GPU is highly recommended for machine learning.
  • Two TCP ports and good internet connection: 2000 and 2001 by default. Be sure neither firewall nor any other application are blocking these.

##Necessary software

Minor installations

Some software is needed for the build process the installation of which is quite straightforward.
  • CMake: Generates standard build files from simple configuration files.
  • Git: Version control system to manage CARLA repositories.
  • Make: Executable generator.
  • Python3 x64: Main script language that CARLA provides support to. Having a x32 version installed may cause conflict even if the x64 is also there, so it is highly advisable to uninstall these.

!!! Important Be sure that these programs are added to your environment path, so you can use them from your command prompt. The path values to add lead to the bin directories for each software.

Visual Studio 2017

Get the 2017 version from here. Community is the free version. Two elements will be needed to set up the environment for the build process. These must be added when using the Visual Studio Installer:

  • Windows 8.1 SDK: On the right there is an Installation details section. Find this SDK and select it.
  • x64 Visual C++ Toolset: In the main Workloads section, choose Desktop development with C++. Thus will enable a x64 command prompt that will be used for the build. After installing, check this up by pressing the Win button and search for x64 (be careful to not open a x86_x64 prompt). The name of this command prompt can change a bit depending on the Visual Studio installed.

!!! Important Having other Visual Studio versions may cause conflict during the build process, even if these have been uninstalled (Visual Studio is not that good at getting rid of itself and erasing registers). To completely clean Visual Studio from the computer run .\InstallCleanup.exe -full found in Program Files (x86)\Microsoft Visual Studio\Installer\resources\app\layout. This may need admin permissions.

Unreal Engine 4.22

Go to the Unreal Engine site and download the Epic Games Launcher. In the Library section, inside the Engine versions panel, download any Unreal Engine 4.22.x version. After installing it, make sure to run it in order to be sure that everything was properly installed.

!!! Note This note will only be relevant if issues arise during the build process and manual build is required. Having VS2017 and UE4.22 installed, a Generate Visual Studio project files option should appear when doing right-click on .uproject files. If this option is not available, something went wrong while installing Unreal Engine and it may need to be reinstalled. Create a simple Unreal Engine project to check up.

CARLA build

!!! Important Lots of things have happened so far. It is highly advisable to do a quick restart of the system.

Clone repository

The project can be found in GitHub. It should be either downloaded and extracted or cloned on the local computer. To do so, open the x64 terminal previously installed and go to the path where CARLA will be installed. Then, run the following command:

git clone https://github.com/carla-simulator/carla

Now the latest content for the project, known as master branch in the repository, has been copied in local.

!!! Note The master branch contains the latest fixes and features. Stable code is inside the stable branch, and it can be built by changing the branch. The same goes for previous CARLA releases. Always remember to check the current branch in git with git branch.

Get assets

Only the assets package, the visual content, is yet to be downloaded. \Util\ContentVersions.txt contains the links to the assets for every CARLA version. These must be extracted in Unreal\CarlaUE4\Content\Carla. If the path doesn't exist, create it.
Download the latest assets to work with the current version of CARLA. When working with branches containing previous releases of CARLA, make sure to download the proper assets.

make CARLA

Go to the root CARLA folder, the one cloned from the repository. It is time to do the automatic build. The process may take a while, it will download and install the necessary libraries. It might take 20-40 minutes, depending on hardware and internet connection. There are different make commands to build the different modules:

  • launch will compile the server simulator and launch it in Unreal Engine. Press Play to start the spectator view and close the editor window to exit. Camera can be moved with WASD keys and rotated by clicking the scene while moving the mouse around:
make launch

!!! Note The project may ask to build other instances such as UE4Editor-Carla.dll the first time (needed to cook the content to launch). Agree in order to open the project. Also, during the first launch Unreal Editor may show warnings regarding shaders and mesh distance fields. These take some time to be loaded and the city will not show properly until then.

  • PythonAPI will compile the API client, necessary to grant control over the simulation. It is only needed the first time (remember to run it again when the CARLA code is updated). After building it, scripts can run. The following example will spawn some life into the city:
make PythonAPI && cd PythonAPI/Examples && python tm_spawn_npc.py

!!! Note If the simulation is running at very low FPS rates, open the UE4.22 editor and go to "Edit>Editor preferences>Performance" and disable: Use less CPU when in background.

Now everything is ready to go and CARLA has been successfully built. Here is a brief summary of the most useful make commands available:

Command Description
make help Prints all available commands.
make launch Launches CARLA Editor.
make PythonAPI Builds the CARLA client.
make package Builds CARLA and creates a packaged version for distribution.
make clean Deletes all the binaries and temporals generated by the build system.
make rebuild make clean and make launch both in one command.

Keep reading this section to learn more about how to update CARLA, the build itself and some advanced configuration options. Otherwise, visit the First steps section to learn about CARLA: