Шейдер. Собственное освещение модели Phong

CGPROGRAM
#pragma surface surf BlinnPhong

CGPROGRAM
#pragma surface surf CustomBlinnPhong

        inline fixed4 LightingCustomBlinnPhong (SurfaceOutput s, fixed3 lightDir, half3 viewDir, fixed atten)
        {
            float3 halfVector = normalize(lightDir + viewDir);
            float diff = max(0, dot(s.Normal, lightDir));
            float nh = max(0, dot(s.Normal, halfVector));
            float spec = pow(nh, _SpecPower) * _SpecularColor;
            float4 c;
            c.rgb = (s.Albedo * _LightColor0.rgb * diff) + (_LightColor0.rgb * _SpecularColor.rgb * spec) * (atten * 2);
            c.a = s.Alpha;
            return c;
        }

#pragma surface surf BlinnPhong

Shader "Custom/BasicShader2Piisim" {
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
 
        _MainTint ("Diffuse Tint", Color) = (1,1,1,1)
        _SpecularColor ("Specular Color", Color) = (1,1,1,1)
        _SpecPower ("Specular Power", Range(0,30)) = 1
 
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200
 
        CGPROGRAM
        //#pragma surface surf Standard fullforwardshadows
        #pragma surface surf Phong
 
        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0
 
        sampler2D _MainTex;
        float4 _SpecularColor;
        float4 _MainTint;
        float _SpecPower;
 
        struct Input {
            float2 uv_MainTex;
        };
 
        fixed4 _Color;
 
 
        UNITY_INSTANCING_BUFFER_START(Props)
        UNITY_INSTANCING_BUFFER_END(Props)
 
        inline fixed4 LightingPhong (SurfaceOutput s, fixed3 lightDir, half3 viewDir, fixed atten)
        {
            //Вычислим диффузный и отражённый вектор
            float diff = dot(s.Normal, lightDir);
            float3 reflectionVector = normalize(2.0 * s.Normal * diff - lightDir);
            float spec = pow(max(0, dot(reflectionVector, viewDir)), _SpecPower);
            float3 finalSpec = _SpecularColor.rgb * spec;
            fixed4 c;
            c.rgb = (s.Albedo * _LightColor0.rgb * diff) + (_LightColor0.rgb *
            finalSpec);
            c.a = 1.0;
            return c;
        }
 
        void surf (Input IN, inout SurfaceOutput o) {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
 
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

#pragma surface surf Phong

#pragma surface surf BlinnPhong