Shader "Unlit/Cha"
{
	Properties
	{
		_MainTex("Main", 2D) = "white" {}
		_Thred("Edge Thred" , Range(0.01,1)) = 0.25
		_Range("Edge Range" , Range(1,10)) = 1
		_Pow("Edge Intensity",Range(0,10)) = 1
	}

		SubShader
		{
			Tags { "RenderType" = "Opaque" }
			LOD 100

			Pass
			{
				CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				// make fog work
				#pragma multi_compile_fog

				#include "UnityCG.cginc"

				struct appdata
				{
					float4 vertex : POSITION;
					float2 uv : TEXCOORD0;
					float3 normal : NORMAL;
				};

				struct v2f
				{
					float2 uv : TEXCOORD0;
					//UNITY_FOG_COORDS(1)
					float4 vertex : SV_POSITION;
					float3 worldPos : TEXCOORD1;
					float3 vdotn : TEXCOORD2;
				};

				sampler2D _MainTex;
				float4 _MainTex_ST;
				float _Thred;
				float _Range;
				float _Pow;

				v2f vert(appdata v)
				{
					v2f o;
					o.vertex = UnityObjectToClipPos(v.vertex);
					o.uv = TRANSFORM_TEX(v.uv, _MainTex);
					o.worldPos = UnityObjectToClipPos(v.vertex);
					float3 viewDir = normalize(mul(unity_WorldToObject, float4(_WorldSpaceCameraPos.xyz, 1)).xyz - v.vertex);
					o.vdotn = dot(viewDir, v.normal);
					return o;
				}

				fixed4 frag(v2f i) : SV_Target
				{
					fixed4 mainTex = tex2D(_MainTex, i.uv);
		
					fixed4 col = mainTex;// fixed4(blend, blend, blend, 1);//*mainTex;

				fixed edge = pow(i.vdotn, 1) / _Range;
				edge = edge > _Thred ? 1 : edge;
				edge = pow(edge, _Pow);
				fixed4 edgeColor = fixed4(edge, edge, edge, edge);

				col = edgeColor * (1 - edgeColor.a) + col * (edgeColor.a);
		// sample the texture
		//fixed4 col = tex2D(_MainTex, i.uv);
		// apply fog
		//UNITY_APPLY_FOG(i.fogCoord, col);
		return col;
	}
	ENDCG
}
		}
}