CameraClipTessellation.shader

Shader "Surface/Standard With Camera Clipping Tesselate" {
	Properties {
		_Tess ("Tessellation", Range(1,32)) = 4
		_Color ("Color", Color) = (1,1,1,1)
		_MainTex ("Albedo (RGB)", 2D) = "white" {}
		_Glossiness ("Smoothness", Range(0,1)) = 0.5
		_Metallic ("Metallic", Range(0,1)) = 0.0
		_ClipThreshold("Clip Threshold", Float) = 1
		_EdgeSize("Clip Edge Size", Float) = 1
		_ClipColor("Clip Edge Color", Color) = (1,1,1,1)
	}
	SubShader {
		Tags { "RenderType"="Opaque" "RenderQueue"="Geometry" }
		LOD 200

		CGPROGRAM

		#pragma surface surf Standard fullforwardshadows vertex:vert alpha:fade tessellate:tessFixed
		#pragma target 5.0

		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
			fixed4 color : COLOR;
			float discardValue;
		};

		half _Glossiness;
		half _Metallic;
		fixed4 _Color;
		fixed4 _ClipColor;
		float _EdgeSize;
		float _ClipThreshold;
		
		float _Tess;
		float4 tessFixed()
		{
			return _Tess;
		}

		UNITY_INSTANCING_BUFFER_START(Props)
		UNITY_INSTANCING_BUFFER_END(Props)

		void vert (inout appdata_full v) {
			v.color = fixed4(0,0,0,1);

			float dist = distance(_WorldSpaceCameraPos, mul(unity_ObjectToWorld, v.vertex));
			if(dist <= _ClipThreshold + _EdgeSize){
				float difference = _ClipThreshold - _EdgeSize;
				v.color = lerp(fixed4(0,0,0,1),_ClipColor,difference);
			}
			if(dist <= _ClipThreshold){
				v.color.a = 0;
			}
		}

		void surf (Input IN, inout SurfaceOutputStandard o) {
			fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
			o.Albedo = c.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Glossiness;
			o.Alpha = IN.color.a;
			o.Emission = IN.color;
		}
		ENDCG
	}
	FallBack "Diffuse"
}