UE4 C++生成actor截图

你可以使用UE4的截图API来生成Actor的截图。以下是一些简单的步骤：

1. 在你的Actor类中添加一个函数，该函数将用于生成截图。例如：

void MyActor::TakeScreenshot()
{
    UWorld* World = GetWorld();
    if (World)
    {
        // 获取GameViewportClient
        UGameViewportClient* ViewportClient = World->GetGameViewport();
        if (ViewportClient)
        {
            // 获取Viewport大小
            int32 Width, Height;
            ViewportClient->GetViewportSize(Width, Height);

            // 创建RenderTarget
            UTextureRenderTarget2D* RenderTarget = UTextureRenderTarget2D::CreateTransient(Width, Height);

            // 创建SceneCaptureComponent2D
            USceneCaptureComponent2D* SceneCaptureComponent = NewObject<USceneCaptureComponent2D>(this);

            // 设置SceneCaptureComponent2D
            SceneCaptureComponent->TextureTarget = RenderTarget;
            SceneCaptureComponent->FOVAngle = 90.f;
            SceneCaptureComponent->bCaptureEveryFrame = false;
            SceneCaptureComponent->bCaptureOnMovement = false;

            // 将SceneCaptureComponent2D添加到Actor中
            SceneCaptureComponent->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepRelativeTransform);

            // 绘制Actor到RenderTarget中
            ViewportClient->Draw();
            SceneCaptureComponent->CaptureScene();

            // 保存RenderTarget到PNG文件
            FString FilePath = FPaths::ProjectSavedDir() / TEXT("Screenshots/MyActor.png");
            FHighResScreenshotConfig Config;
            Config.SetHDRCapture(false);
            Config.SetResolutionMultiplier(1);
            Config.SaveImage(FilePath, RenderTarget);

            // 删除SceneCaptureComponent2D
            SceneCaptureComponent->DetachFromComponent(FDetachmentTransformRules::KeepRelativeTransform);
            SceneCaptureComponent->DestroyComponent();
        }
    }
}

2. 在需要截图的地方调用该函数。例如，你可以将该函数添加到Actor的OnClicked事件中：

void MyActor::OnClicked()
{
    TakeScreenshot();
}

3. 运行游戏，并在Actor上单击以生成截图。截图将保存在项目的Saved/Screenshots目录中。

希望这能够帮助到你！