TheCurveShader

Shader "Custom/Curved" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
        _QOffset ("Offset", Vector) = (0,0,0,0)
        _Brightness ("Brightness", Float) = 0.0
        _Dist ("Distance", Float) = 100.0
    }

    SubShader {
        Tags { "Queue" = "Transparent"}
        Pass
        {

            Blend SrcAlpha OneMinusSrcAlpha
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _QOffset;
            float _Dist;
            float _Brightness;

            struct v2f {
                float4 pos : SV_POSITION;
                float4 uv : TEXCOORD0;
                float3 viewDir : TEXCOORD1;
                fixed4 color : COLOR;
            };

            v2f vert (appdata_full v)
            {
               v2f o;
               float4 vPos = mul (UNITY_MATRIX_MV, v.vertex);
               float zOff = vPos.z/_Dist;
               vPos += _QOffset*zOff*zOff;
               o.pos = mul (UNITY_MATRIX_P, vPos);
               o.uv = v.texcoord;
               return o;
            }
            half4 frag (v2f i) : COLOR0
            {
                half4 col = tex2D(_MainTex, i.uv.xy);
                col *= UNITY_LIGHTMODEL_AMBIENT*_Brightness;
                return col;
            }
            ENDCG
        }
    }

    FallBack "Diffuse"
}