シェーダーで陰つける

陰影の、陰(shader)をつける

Shader "RDSystem/Surface2"
{
    Properties
    {
        _MainTex("RD Texture", 2D) = "white" {}
        [Space]
        _Color0("Color 0", Color) = (1,1,1,1)
        _Color1("Color 1", Color) = (1,1,1,1)
        [Space]
        _Smoothness0("Smoothness 0", Range(0, 1)) = 0.5
        _Smoothness1("Smoothness 1", Range(0, 1)) = 0.5
        [Space]
        _Metallic0("Metallic 0", Range(0, 1)) = 0.0
        _Metallic1("Metallic 1", Range(0, 1)) = 0.0
        [Space]
        _Threshold("Threshold", Range(0, 1)) = 0.1
        _Fading("Edge Smoothing", Range(0, 1)) = 0.2
        _NormalStrength("Normal Strength", Range(0, 1)) = 0.9
        [Space]
        _Loop("Loop",float) = 1
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }

        CGPROGRAM

        #pragma surface surf Standard
        #pragma target 3.0

        sampler2D _MainTex;
        float4 _MainTex_TexelSize;

        struct Input { float2 uv_MainTex; };

        fixed4 _Color0, _Color1;
        half _Smoothness0, _Smoothness1;
        half _Metallic0, _Metallic1;
        half _Threshold, _Fading;
        half _NormalStrength;
        float _Loop;

        void surf(Input IN, inout SurfaceOutputStandard o)
        {
            float3 duv = float3(_MainTex_TexelSize.xy, 0);

            half v0 = tex2D(_MainTex, IN.uv_MainTex).y;
            half v1 = tex2D(_MainTex, IN.uv_MainTex - duv.xz).y;
            half v2 = tex2D(_MainTex, IN.uv_MainTex + duv.xz).y;
            half v3 = tex2D(_MainTex, IN.uv_MainTex - duv.zy).y;
            half v4 = tex2D(_MainTex, IN.uv_MainTex + duv.zy).y;

            v0 = frac(v0*_Loop);
            v1 = frac(v1*_Loop);
            v2 = frac(v2*_Loop);
            v3 = frac(v3*_Loop);
            v4 = frac(v4*_Loop);


            half p = smoothstep(_Threshold, _Threshold + _Fading, v0);

            o.Albedo = lerp(_Color0.rgb, _Color1.rgb, p);
            o.Smoothness = lerp(_Smoothness0, _Smoothness1, p);
            o.Metallic = lerp(_Metallic0, _Metallic1, p);
            //o.Normal = normalize( float3(v1 - v2, v3 - v4, 1 - _NormalStrength) );
            o.Normal = normalize(float3(v0 - v2, v0 - v4, 1 - _NormalStrength));
        }

        ENDCG
    }
    FallBack "Diffuse"
}