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Shader "XRIT/BiRP_Fresnel"
{
Properties
{
_BaseColor ("_BaseColor", Color) = (0, 0, 0, 1)
_MainTex ("Texture", 2D) = "white" {}
_Smoothness ("Smoothness", Range(0, 1)) = 0
_Metallic ("Metalness", Range(0, 1)) = 0
_RimColor ("_RimColor", Color) = (1,1,1,1)
[PowerSlider(4)]_RimPower ("_RimPower", Range(0.25, 10)) = 1
}
SubShader
{
Tags
{
"RenderType"="Opaque"
}
LOD 200
CGPROGRAM
#if !defined(UNITY_USES_HDRP) && !defined(UNITY_USES_URP)
// Physically based Standard lighting model, and enable shadows on all light types
#pragma surface surf Standard fullforwardshadows
// Use shader model 3.0 target, to get nicer looking lighting
#pragma target 3.0
sampler2D _MainTex;
fixed4 _BaseColor;
half _Smoothness;
half _Metallic;
float3 _RimColor;
float _RimPower;
struct Input
{
float2 uv_MainTex;
float3 worldNormal;
float3 viewDir;
INTERNAL_DATA
};
// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
// #pragma instancing_options assumeuniformscaling
UNITY_INSTANCING_BUFFER_START(Props)
UNITY_INSTANCING_BUFFER_END(Props)
half4 LightingSimpleLambert (SurfaceOutput s, half3 lightDir, half atten) {
half NdotL = dot (s.Normal, lightDir);
half4 c;
c.rgb = s.Albedo * _LightColor0.rgb * (NdotL * atten);
c.a = s.Alpha;
return c;
}
void surf(Input i, inout SurfaceOutputStandard o)
{
//sample and tint albedo texture
fixed4 col = tex2D(_MainTex, i.uv_MainTex);
col *= _BaseColor;
o.Albedo = col.rgb;
//just apply the values for metalness and smoothness
o.Metallic = _Metallic;
o.Smoothness = _Smoothness;
//get the dot product between the normal and the view direction
float fresnel = dot(i.worldNormal, i.viewDir);
//invert the fresnel so the big values are on the outside
fresnel = saturate(1 - fresnel);
//raise the fresnel value to the exponents power to be able to adjust it
fresnel = pow(fresnel, _RimPower);
//combine the fresnel value with a color
float3 fresnelColor = fresnel * _RimColor;
//apply the fresnel value to the emission
o.Emission = fresnelColor;
}
#endif
ENDCG
}
FallBack "Diffuse"
FallBack "Standard"
}
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