static int Main(string[] args)
{
    // 检查是否Load Simplygon
    using var sg = Simplygon.Loader.InitSimplygon(out var errorCode, out var errorMessage);
    if (errorCode != Simplygon.EErrorCodes.NoError)
    {
        Console.WriteLine($"Failed to initialize Simplygon: ErrorCode({(int)errorCode}) {errorMessage}");
        return (int)errorCode;
    }
    // 运行减面程序
    RunReduction(sg);

    return 0;
}

static void RunReduction(Simplygon.ISimplygon sg)
{
    // 加载模型/场景         
    Console.WriteLine("Load scene to process.");
    Simplygon.spScene sgScene = LoadScene(sg, "../../../SimplygonMan.obj");

    // 初始化
    using Simplygon.spReductionProcessor sgReductionProcessor = sg.CreateReductionProcessor();
    sgReductionProcessor.SetScene(sgScene);
    using Simplygon.spReductionSettings sgReductionSettings = sgReductionProcessor.GetReductionSettings();

    // 减面设置
    sgReductionSettings.SetReductionTargets(Simplygon.EStopCondition.All, true, false, false, false);
    // 三角面变为50%
    sgReductionSettings.SetReductionTargetTriangleRatio(0.5f);

    // 运行        
    Console.WriteLine("Start the reduction process.");
    sgReductionProcessor.RunProcessing();

    // 保存模型，通过修改后缀可以实现导出obj, fbx, usd等类型的模型         
    Console.WriteLine("Save processed scene.");
    SaveScene(sg, sgScene, "Output.obj");
       
    Console.WriteLine("Check log for any warnings or errors.");
    CheckLog(sg);
}

static Simplygon.spScene LoadScene(Simplygon.ISimplygon sg, string path)
{
    // Create scene importer 
    using Simplygon.spSceneImporter sgSceneImporter = sg.CreateSceneImporter();
    sgSceneImporter.SetImportFilePath(path);

    // Run scene importer. 
    var importResult = sgSceneImporter.Run();
    if (Simplygon.Simplygon.Failed(importResult))
    {
        throw new System.Exception("Failed to load scene.");
    }
    Simplygon.spScene sgScene = sgSceneImporter.GetScene();
    return sgScene;
}

static void SaveScene(Simplygon.ISimplygon sg, Simplygon.spScene sgScene, string path)
{
    // Create scene exporter. 
    using Simplygon.spSceneExporter sgSceneExporter = sg.CreateSceneExporter();
    string outputScenePath = string.Join("", new string[] { "output\\", "Reduction", "_", path });
    sgSceneExporter.SetExportFilePath(outputScenePath);
    sgSceneExporter.SetScene(sgScene);

    // Run scene exporter. 
    var exportResult = sgSceneExporter.Run();
    if (Simplygon.Simplygon.Failed(exportResult))
    {
        throw new System.Exception("Failed to save scene.");
    }
}

static void CheckLog(Simplygon.ISimplygon sg)
{
    // Check if any errors occurred. 
    bool hasErrors = sg.ErrorOccurred();
    if (hasErrors)
    {
        Simplygon.spStringArray errors = sg.CreateStringArray();
        sg.GetErrorMessages(errors);
        var errorCount = errors.GetItemCount();
        if (errorCount > 0)
        {
            Console.WriteLine("Errors:");
            for (uint errorIndex = 0; errorIndex < errorCount; ++errorIndex)
            {
                string errorString = errors.GetItem((int)errorIndex);
                Console.WriteLine(errorString);
            }
            sg.ClearErrorMessages();
        }
    }
    else
    {
        Console.WriteLine("No errors.");
    }

    // Check if any warnings occurred. 
    bool hasWarnings = sg.WarningOccurred();
    if (hasWarnings)
    {
        Simplygon.spStringArray warnings = sg.CreateStringArray();
        sg.GetWarningMessages(warnings);
        var warningCount = warnings.GetItemCount();
        if (warningCount > 0)
        {
            Console.WriteLine("Warnings:");
            for (uint warningIndex = 0; warningIndex < warningCount; ++warningIndex)
            {
                string warningString = warnings.GetItem((int)warningIndex);
                Console.WriteLine(warningString);
            }
            sg.ClearWarningMessages();
        }
    }
    else
    {
        Console.WriteLine("No warnings.");
    }

    // Error out if Simplygon has errors. 
    if (hasErrors)
    {
        throw new System.Exception("Processing failed with an error");
    }
}