Shader-内轮廓自发光效果

需求

1 基于涅菲尔反射的变形

原理 (近处的反射少，远处反射多)

1)公式(近似)：F = Fscale + (1-Fscale)(1-v·n)^5
利用fresnel做边缘发光，代码

fixed fresnel = _FresnelScale + (1 - _FresnelScale) * pow(1 - dot(viewDir, worldNormal), _PowVal);//涅菲尔公式：_PowVal =5

_ColorFresnel * saturate(fresnel)

2 基于表面着色器Unity2019

Shader "Unlit/FirstShader"

{

	Properties

	{

			_MainTex(" Diffuse (RGB)", 2D) = "white" {}

			_NormalMap("Normal Map", 2D) = "bump" {}

    _RimColor ("Rim Color", Color) = (1.0, 1.0, 1.0, 0.0)

    //_RimConcentration ("Rim Concentration", Range(0.5, 5.0)) = 0.9

    _RimStrength ("Rim Strength", Range(1.0, 4.0)) = 1.45

	}

		SubShader

	{

		Tags { "RenderType" = "Opaque" }

		CGPROGRAM

		#pragma surface surf Lambert

		sampler2D _MainTex;

		sampler2D _NormalMap;

		float4 _RimColor;

		float _RimConcentration;

		float _RimStrength;

		struct Input

		{

			float2 uv_MainTex;

			float2 uv_NormalMap;

			float3 viewDir;

		};

		void surf(Input In, inout SurfaceOutput o)

		{

				fixed4 c = tex2D(_MainTex, In.uv_MainTex);

				float Lc = saturate(dot(normalize(In.viewDir), o.Normal));

				half rim = 1.0 - Lc;

				o.Albedo = c.rgb;

				o.Normal = UnpackNormal(tex2D(_NormalMap, In.uv_NormalMap));

				o.Alpha = c.a;

				//o.Emission = _RimColor.rgb * pow(rim, _RimConcentration);

				o.Emission = _RimStrength * (_RimColor.rgb * smoothstep(0.2, 0.6, rim));

		}

		ENDCG

	}

		FallBack "Diffuse"

}

巴特西

Shader-内轮廓自发光效果

需求

1 基于涅菲尔反射的变形

2 基于表面着色器Unity2019

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