Unity shader graph自定义函数报错“variable used without have been completely initialized”

Question

这是我第一次使用统一着色器，我正在学习本教程。在本教程中，他创建了一个 .hlsl 文件并创建了一个自定义函数，但是当我尝试这样做时，我收到错误消息“变量‘_CustomFunction_dad33bdd979a432eb742f1837c25625c_Direction_0’在第 176 行没有完全初始化就使用了”

我已经在网上搜索了 2 天，但似乎找不到太多，我找到了一些关于 UNITY_INITIALIZE_OUTPUT() 的信息，但我不确定它是否对我有帮助或如何使用它。我正在使用 Unity 版本 2021.3.21f1.

这是用于创建自定义函数的 .hlsl 文件中的代码

    #ifndef CUSTOM_LIGHTING_INCLUDED
    #define CUSTOM_LIGHTING_INCLUDED
    
    void MainLight_float(float3 WorldPos, out float3 Direction, out float3 Color, out float DistanceAtten, out float ShadowAtten)
    {
        //these values apply ONLY inside the shader graph window
    #if SHADERGRAPH_PREVIEW
        Direction = float3(0.5, 0.5, 0);
        Color = 1;
        DistanceAtten = 1;
        ShadowAtten = 1;
    #else
    #if SHADOWS_SCREEN
        float4 clipPos = TransformWorldToHClip(WorldPos);
        float4 shadowCoord = ComputeScreenPos(clipPos);
    #else
        float4 shadowCoord = TransformWorldToShadowCoord(WorldPos);
    #endif
        Light mainLight = GetMainLight(shadowCoord);
        //Direction, Color, and Attenuation of light hitting the object
        Direction = mainLight.direction;
        Color = mainLight.color;
        DistanceAtten = mainLight.distanceAttenuation;
        ShadowAtten = mainLight.shadowAttenuation;
    #endif
    }
    
    void MainLight_half(float3 WorldPos, out half3 Direction, out half3 Color, out half DistanceAtten, out half ShadowAtten)
    {
    #if SHADERGRAPH_PREVIEW
        Direction = half3(0.5, 0.5, 0);
        Color = 1;
        DistanceAtten = 1;
        ShadowAtten = 1;
    #else
    #if SHADOWS_SCREEN
        half4 clipPos = TransformWorldToHClip(WorldPos);
        half4 shadowCoord = ComputeScreenPos(clipPos);
    #else
        half4 shadowCoord = TransformWorldToShadowCoord(WorldPos);
    #endif
        Light mainLight = GetMainLight(shadowCoord);
        Direction = mainLight.direction;
        Color = mainLight.color;
        DistanceAtten = mainLight.distanceAttenuation;
        ShadowAtten = mainLight.shadowAttenuation;
    #endif
    }
    
    void DirectSpecular_float(float3 Specular, float Smoothness, float3 Direction, float3 Color, float3 WorldNormal, float3 WorldView, out float3 Out)
    {
    #if SHADERGRAPH_PREVIEW
        Out = 0;
    #else
        Smoothness = exp2(10 * Smoothness + 1);
        WorldNormal = normalize(WorldNormal);
        WorldView = SafeNormalize(WorldView);
        Out = LightingSpecular(Color, Direction, WorldNormal, WorldView, float4(Specular, 0), Smoothness);
    #endif
    }
    
    void DirectSpecular_half(half3 Specular, half Smoothness, half3 Direction, half3 Color, half3 WorldNormal, half3 WorldView, out half3 Out)
    {
    #if SHADERGRAPH_PREVIEW
        Out = 0;
    #else
        Smoothness = exp2(10 * Smoothness + 1);
        WorldNormal = normalize(WorldNormal);
        WorldView = SafeNormalize(WorldView);
        Out = LightingSpecular(Color, Direction, WorldNormal, WorldView, half4(Specular, 0), Smoothness);
    #endif
    }
    
    void AdditionalLights_float(float3 SpecColor, float Smoothness, float3 WorldPosition, float3 WorldNormal, float3 WorldView, out float3 Diffuse, out float3 Specular)
    {
        float3 diffuseColor = 0;
        float3 specularColor = 0;
    
    #ifndef SHADERGRAPH_PREVIEW
        Smoothness = exp2(10 * Smoothness + 1);
        WorldNormal = normalize(WorldNormal);
        WorldView = SafeNormalize(WorldView);
        int pixelLightCount = GetAdditionalLightsCount();
        for (int i = 0; i < pixelLightCount; ++i)
        {
            Light light = GetAdditionalLight(i, WorldPosition);
            half3 attenuatedLightColor = light.color * (light.distanceAttenuation * light.shadowAttenuation);
            diffuseColor += LightingLambert(attenuatedLightColor, light.direction, WorldNormal);
            specularColor += LightingSpecular(attenuatedLightColor, light.direction, WorldNormal, WorldView, float4(SpecColor, 0), Smoothness);
        }
    #endif
    
        Diffuse = diffuseColor;
        Specular = specularColor;
    }
    
    void AdditionalLights_half(half3 SpecColor, half Smoothness, half3 WorldPosition, half3 WorldNormal, half3 WorldView, out half3 Diffuse, out half3 Specular)
    {
        half3 diffuseColor = 0;
        half3 specularColor = 0;
    
    #ifndef SHADERGRAPH_PREVIEW
        Smoothness = exp2(10 * Smoothness + 1);
        WorldNormal = normalize(WorldNormal);
        WorldView = SafeNormalize(WorldView);
        int pixelLightCount = GetAdditionalLightsCount();
        for (int i = 0; i < pixelLightCount; ++i)
        {
            Light light = GetAdditionalLight(i, WorldPosition);
            half3 attenuatedLightColor = light.color * (light.distanceAttenuation * light.shadowAttenuation);
            diffuseColor += LightingLambert(attenuatedLightColor, light.direction, WorldNormal);
            specularColor += LightingSpecular(attenuatedLightColor, light.direction, WorldNormal, WorldView, half4(SpecColor, 0), Smoothness);
        }
    #endif
    
        Diffuse = diffuseColor;
        Specular = specularColor;
    }
    
    #endif
    
    #endif