在Unity中可视化一个值范围从0到1又回到0的图像栏

Shader "Custom/ValueRange" {
    Properties {
        _Color ("Color", Color) = (1, 1, 1, 1)
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Lambert

        sampler2D _MainTex;
        fixed4 _Color;

        struct Input {
            float2 uv_MainTex;
        };

        void surf (Input IN, inout SurfaceOutput o) {
            fixed value = sin(_Time.y); // 获取一个从0到1又回到0的值
            fixed4 col = lerp(fixed4(0, 0, 0, 0), _Color, value); // 根据值设置颜色
            o.Albedo = col.rgb;
            o.Alpha = col.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}