Shader "AR/GrayCylinder" {

    Properties {
        _MainTex ("Cylinder Texture", 2D) = "white" {}
    }

    SubShader{
        Tags { "RenderType" = "Opaque" }

        Pass {

            Cull Off


            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag

            fixed4 _Color;

            struct Input {
                float4 position : POSITION;
                float4 color : COLOR;
                float2 coord : TEXCOORD0;
            };

            struct VertexToFragment {
                float4 position : SV_POSITION;
                float4 color : COLOR;
                float2 coord : TEXCOORD0;
            };

            VertexToFragment vert(Input IN) {
                VertexToFragment OUT;
                OUT.position = UnityObjectToClipPos( IN.position);
                OUT.color = IN.color;
                OUT.coord = IN.coord;
                return OUT;
            }
            
            sampler2D _MainTex;
            float2 _NoiseVector;

            
            fixed4 frag(VertexToFragment IN) : SV_Target {
                half4 c = tex2D(_MainTex, IN.coord);
                
                float rand = frac(sin(dot(IN.position, _NoiseVector)) * 43758.5453);
                
                c.rgb = dot(c.rgb, float3(0.3, 0.59, 0.11));

                c.rgb -= rand*0.2;
                return c;
            }

            ENDCG
        }
    }
}