Unityで市松模様に穴をあけるシェーダー

ほとんど、Project -> Create -> Shader -> Standard Surface Shaderで作られるデフォルトのサーフェスシェーダーのまま。

違いは、パラメータの_DivisionとCull Offとsurf関数の最初の行だけ。
_Divisionパラメータで分割の大きさを決定する。

Shader "My/CheckerPattern" {
    Properties {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
        _Division ("Division", Int) = 5
    }
    SubShader {
        Tags { "RenderType"="Opaque" }
        LOD 200

        Cull Off

        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;

        struct Input {
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
        int _Division;

        // 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) {
            if (int(fmod(floor(IN.uv_MainTex.x * _Division) + floor(IN.uv_MainTex.y * _Division), 2.0)) == 0) {
                discard;
            } 
            // Albedo comes from a texture tinted by color
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            // Metallic and smoothness come from slider variables
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}