Unityで２つのテクスチャを合成(度合い設定可)するシェーダーを書いてみる

Shader "Custom/Blend" {
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Main Texture", 2D) = "white" {}
        _SubTex("Sub Texture", 2D) = "white" {} // 追加
        _Glossiness("Smoothness", Range(0,1)) = 0.5
        _Metallic("Metallic", Range(0,1)) = 0.0
        _Blend("Blend", Range(0,1)) = 0.0 // 追加
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf Standard fullforwardshadows

        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _MainTex;
        sampler2D _SubTex; // 追加

        struct Input {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        half _Blend; // 追加
        fixed4 _Color;

        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_CBUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_CBUFFER_END

        void surf (Input IN, inout SurfaceOutputStandard o) {
            // Albedo comes from a texture tinted by color
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            fixed4 c2 = tex2D(_SubTex, IN.uv_MainTex) * _Color; // 追加
            o.Albedo = lerp(c.rgb, c2.rgb, _Blend); // 修正
            // Metallic and smoothness come from slider variables
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}

// 変数の設定
GetComponent<Renderer>().material.SetTexutre("_MainTex", texture);
GetComponent<Renderer>().material.SetTexutre("_SubTex", texture);
GetComponent<Renderer>().material.SetFloat("_Blend", 0.5f);

// 変数の取得
GetComponent<Renderer>().material.GetFloat("_Blend");