GreedyMaterial

Shader "Custom/GreedyMaterial" {
    Properties{
        _Color("Color", Color) = (1,1,1,1)
        _MainTex("Albedo (RGB)", 2D) = "white" {}
    }
    SubShader{
        Tags{ "RenderType" = "Opaque" }
        LOD 200

        CGPROGRAM
        // Physically based Standard lighting model, and enable shadows on all light types
        //#pragma surface surf Standard fullforwardshadows
        #pragma surface surf Lambert //fullforwardshadows

        #pragma target 2.0

        sampler2D _MainTex;

        struct Input
        {
            float4 color : COLOR;
            float3 worldNormal;
            float3 worldPos;
            float2 uv_MainTex;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;

        void surf(Input i, inout SurfaceOutput o) {

            const float gridSize = 16; //How many cells are in a row
            const float margin = 0; //(1 / gridSize) / 16; //Margin for preventing bleeding
            const float cellSize = (1 / gridSize) - (margin * 2); //Size of one cell
                                                                  //float blockId = int(i.color.a * gridSize * gridSize) / gridSize; //Get tile id from alpha channel, and transform it so that fraction is horizontal position [0, 1] and integer part points vertical position [0, gridSize]
                                                                  //float blockId= int(i.uv_MainTex.y*gridSize) +int(i.uv_MainTex.x/cellSize);
            fixed4 c = tex2D(_MainTex, frac(float2(
                i.worldPos.x * (1 - i.worldNormal.x) + i.worldPos.z * i.worldNormal.x, //Figure out texel location inside a cell.
                i.worldPos.y * (1 - i.worldNormal.y) + i.worldPos.z * i.worldNormal.y)) * cellSize  //Take in account face normal
                                                                                                    //+ float2(blockId + margin, floor(blockId) / gridSize + margin)); //Choose the actual tile
                + float2(int(i.uv_MainTex.x / cellSize)*cellSize, int(i.uv_MainTex.y / cellSize)*cellSize));
            //+i.uv_MainTex);
            o.Albedo = c.rgb*_Color;
            o.Alpha = c.a;
        }
        ENDCG
    }
    FallBack "Diffuse"
}