LightmapStaic有効かEnable GPU Instancing有効でないと機能しません。

RandomObjectColor.shader

Shader "Custom/RandomObjectColor"
{
    Properties
    {
        _Color("Color", Color) = (1,1,1,1)
        _MainTex("Albedo", 2D) = "white" {}

        // _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        [Space] [NoScaleOffset] _SpecGlossMap("Roughness Map", 2D) = "black" {}

        [NoScaleOffset] _MetallicGlossMap("Metallic", 2D) = "black" {}


        [NoScaleOffset][Normal] _BumpMap("Normal Map", 2D) = "bump" {}
        _BumpScale("Normal Scale", Float) = 1.0


        _EmissionColor("Emission", Color) = (0,0,0)
        [NoScaleOffset] _EmissionMap("Emission", 2D) = "white" {}


        [Header(Random Object Color)]
        [NoScaleOffset] _ColorRamp ("Color Ramp", 2D) = "white" {}
        _Mix("Mix", Range(0, 1)) = 1.0

        [Space]
        [Enum(UnityEngine.Rendering.CullMode)] _Cull("Cull", Float) = 2
        [Enum(Off, 0, On, 1)] _ZWrite("ZWrite", Float) = 1
    }

    SubShader
    {
        Tags {
            "RenderType" = "Opaque"
            "Queue" = "Geometry"
        }
        LOD 200
        Cull [_Cull]
        ZWrite [_ZWrite]

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows
        #include "./RandomObjectColor_Core.cginc"
        ENDCG
    }
    FallBack "Diffuse"
}

RandomObjectColor.shader.meta

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RandomObjectColor_AlphaCutoff.shader

Shader "Custom/RandomObjectColor_AlphaCutout"
{
    Properties
    {
        _Color("Color", Color) = (1,1,1,1)
        _MainTex("Albedo", 2D) = "white" {}

        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        [Space] [NoScaleOffset] _SpecGlossMap("Roughness Map", 2D) = "black" {}

        [NoScaleOffset] _MetallicGlossMap("Metallic", 2D) = "black" {}

        _BumpScale("Scale", Float) = 1.0
        [NoScaleOffset][Normal] _BumpMap("Normal Map", 2D) = "bump" {}

        _EmissionColor("Emission", Color) = (0,0,0)
        [NoScaleOffset] _EmissionMap("Emission", 2D) = "white" {}

        [Header(Random Object Color)]
        [NoScaleOffset] _ColorRamp ("Color Ramp", 2D) = "white" {}
        _Mix("Mix", Range(0, 1)) = 1.0
        
        [Space]
        [Enum(UnityEngine.Rendering.CullMode)] _Cull("Cull", Float) = 2
        [Enum(Off, 0, On, 1)] _ZWrite("ZWrite", Float) = 1
    }

    SubShader
    {
        Tags {
            "RenderType" = "Opaque"
            "Queue" = "AlphaTest"
        }
        LOD 200
        Cull [_Cull]
        ZWrite [_ZWrite]

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows alphatest:_Cutoff
        #include "./RandomObjectColor_Core.cginc"
        ENDCG
    }
    FallBack "Diffuse"
}

RandomObjectColor_AlphaCutoff.shader.meta

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RandomObjectColor_Core.cginc

struct Input
{
    float2 uv_MainTex;
};

fixed4 _Color;
sampler2D _MainTex;

float _Glossiness;
sampler2D _SpecGlossMap;

float _Metallic;
sampler2D _MetallicGlossMap;

float _BumpScale;
sampler2D _BumpMap;

fixed4 _EmissionColor;
sampler2D _EmissionMap;

float _Mix;
sampler2D _ColorRamp;

// UNITY_INSTANCING_BUFFER_START(Props)
// UNITY_INSTANCING_BUFFER_END(Props)

inline float rand(float3 co)
{
    return frac(sin(dot(co.xyz, float3(12.9898, 78.233, 56.787))) * 43758.5453);
}

void surf (Input IN, inout SurfaceOutputStandard o)
{
    // float objectId = rand(float3(unity_ObjectToWorld._14, unity_ObjectToWorld._24, unity_ObjectToWorld._34));
    float objectId = rand(mul(unity_ObjectToWorld, float4(0, 0, 0, 1.0)).xyz);
    fixed4 color = tex2D(_MainTex, IN.uv_MainTex) * _Color * lerp(fixed4(1, 1, 1, 1), tex2D(_ColorRamp, float2(objectId, 0.5)), _Mix);
    o.Albedo = color.rgb;
    o.Alpha = color.a;

    o.Normal = UnpackScaleNormal(tex2D(_BumpMap, IN.uv_MainTex), _BumpScale);

    o.Metallic = tex2D(_MetallicGlossMap, IN.uv_MainTex);
    o.Smoothness = 1.0f - tex2D(_SpecGlossMap, IN.uv_MainTex);

    o.Emission = _EmissionColor * tex2D(_EmissionMap, IN.uv_MainTex);
}

RandomObjectColor_Core.cginc.meta

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