Unity Shader 切换贴图 （贴图渐变）

Shader "VrorangeShaders/Qiehuan" {
    Properties{
        _Color("Main Color", Color) = (1,1,1,1)
        _Texture0("Texture0 (RGB)", 2D) = "white" {}
    _Texture1("Texture1 (RGB)", 2D) = "white" {}
    _MixValue("MixValue (Range)",Range(0,1)) = 0.5
    }
        SubShader{
        Cull Back
        ZWrite On
        ZTest LEqual
        Tags{ "Queue" = "Geometry+0" "IgnoreProjector" = "False" "RenderType" = "Opaque" }
        CGPROGRAM
#pragma surface surf Lambert  

        float4 _Color;
    sampler2D _Texture0;
    sampler2D _Texture1;
    float _MixValue;

    struct Input {
        float2 uv_Texture0;
        float2 uv_Texture1;
    };

    void surf(Input IN, inout SurfaceOutput o) {
        half4 c0 = tex2D(_Texture0, IN.uv_Texture0);
        half4 c1 = tex2D(_Texture1, IN.uv_Texture1);
        c0 = c0*_MixValue;
        c1 = c1*(1 - _MixValue);
        o.Albedo = (c0 + c1)*_Color;
    }

    ENDCG
    }
        FallBack "Diffuse"
}

c#代码

 this.GetComponent().material.SetFloat("_MixValue", v);