Rust code in Unreal Engine

I recently finished a proof of concept for getting Rust code integrated into Unreal Engine.

I’ve written a full writeup here, which includes a full demo project and all the necessary engine changes. You’ll need to be logged into GitHub with an account that has access to the Unreal Engine source code. If not, the link will look like a 404 – but it’s easy to request access.

As a quick summary of features I’ve found to work:

Compiling a Rust crate as an Unreal Engine Module

C++ Unreal modules linking to our Rust crate

```c# public class DemoGame : ModuleRules { public DemoGame(ReadOnlyTargetRules Target) : base(Target) { PublicDependencyModuleNames.AddRange(new string[] { "Core", "RustCrate" }); } } ```

Automatic rebuilding C++ and binaries that depend on Rust code when that Rust code changes

``` 1>Building 7 actions with 8 processes... 1> [1/7] Compiling rust crate 'test_crate' 1> Compiling test_crate v0.1.0 (D:\Documents\Rust\UnrealEngine_RustModules\DemoGame\Source\RustCrate) 1> Finished release [optimized + debuginfo] target(s) in 3.24s 1> [2/7] test_crate.Editor.pdb 1> [3/7] test_crate.Editor.dll 1> [4/7] TestCppFile.cpp 1> [5/7] UE4Editor-DemoGame.lib 1> Creating library D:\Documents\Rust\UnrealEngine_RustModules\DemoGame\Intermediate\Build\Win64\UE4Editor\Development\DemoGame\UE4Editor-DemoGame.lib and object D:\Documents\Rust\UnrealEngine_RustModules\DemoGame\Intermediate\Build\Win64\UE4Editor\Development\DemoGame\UE4Editor-DemoGame.exp 1> [6/7] UE4Editor-DemoGame.dll 1> Creating library D:\Documents\Rust\UnrealEngine_RustModules\DemoGame\Intermediate\Build\Win64\UE4Editor\Development\DemoGame\UE4Editor-DemoGame.suppressed.lib and object D:\Documents\Rust\UnrealEngine_RustModules\DemoGame\Intermediate\Build\Win64\UE4Editor\Development\DemoGame\UE4Editor-DemoGame.suppressed.exp 1> [7/7] DemoGameEditor.target 1>Total time in Parallel executor: 3.72 seconds 1>Total execution time: 8.13 seconds ========== Build: 1 succeeded, 0 failed, 2 up-to-date, 0 skipped ========== ```

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