shader

Shader "Curved/CurvedAlpha" {
  Properties {
        _Color("Color", COLOR) = (1, 1, 1, 1)
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_QOffset ("Offset", Vector) = (0,0,0,0)
		_Dist ("Distance", Float) = 100.0
		_Alpha ("Alpha", Range(0.0,1.0)) = 1.0
	}
	SubShader {
		Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
		LOD 100

		ZWrite On
		Blend SrcAlpha OneMinusSrcAlpha

		Pass
		{
			Lighting Off

			CGPROGRAM
			// Upgrade NOTE: excluded shader from DX11; has structs without semantics (struct v2f members factor)
			#pragma exclude_renderers d3d11
			#pragma vertex vert
			#pragma fragment frag
			#include "UnityCG.cginc"

            half4 _Color;
			sampler2D _MainTex;
			float4 _QOffset;
			float _Dist;
			float _Alpha;
			uniform float4 _MainTex_ST;

			struct v2f {
			    float4 pos : SV_POSITION;
			    float2 uv : TEXCOORD0;
				float4 factor: COLOR;
			};

			v2f vert (appdata_base 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 = TRANSFORM_TEX(v.texcoord, _MainTex);
				float factor = max(0, dot(v.normal, float3(0,1,0)));
				o.factor = float4(factor,0,0,0);
			    return o;

			}


            fixed4 frag (v2f i) : COLOR
			{
                //fixed4 color = tex2D(_MainTex, i.uv) * _Color;
			    return tex2D(_MainTex, i.uv)  * float4(_Color.r, _Color.g, _Color.b, _Alpha) * i.factor.x;
			}
			ENDCG
		}

	}

FallBack "Platogo/Unlit Texture Alpha"
}