Unity Shader （五）Surface Shader示例

1、替换颜色

Shader "Custom/Example_Frag_5" {
    Properties {
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _MainColor("MainColor",color)=(1,1,1,1)
        _SecondColor("SecondColor",color)=(1,1,1,1)
        _Center("Center",range(-2.7,2.7))=0
        _R("R",range(0,0.5))=0.2 //颜色渐变的半径
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200
        
        CGPROGRAM
    
        #pragma surface surf Standard vertex:vert fullforwardshadows

        #pragma target 3.0

        sampler2D _MainTex;
        half _Glossiness;
        half _Metallic;
        float4 _MainColor;
        float4 _SecondColor;
        float _R;
        float _Center;


        struct Input {
            float2 uv_MainTex;
            float x;
        };

        void vert(inout appdata_full v,out Input o)
        {
            o.uv_MainTex=v.texcoord.xy;
            o.x=v.vertex.x;
        }



        void surf (Input IN, inout SurfaceOutputStandard o) {
            
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex);
            o.Albedo = c.rgb;
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;

            float d=IN.x-_Center;
            float s=abs(d);
            d=d/s;
            float f=s/_R;
            f=saturate(f);
            d*=f;
            d=d/2+0.5;
            o.Albedo*=lerp(_MainColor,_SecondColor,d)*2;
        }
        ENDCG
    }
    FallBack "Diffuse"
}