{% comment %}
// Copyright 2020 Visual Design Cafe. All rights reserved.
// This shader was created using ShaderX, a shader framework by Visual Design Cafe.
// https://www.visualdesigncafe.com/shaderx

// Package: Nature Shaders
// Website: https://www.visualdesigncafe.com/nature-shaders
// Documentation: https://support.visualdesigncafe.com/hc/categories/900000043503
{% endcomment %}

struct TranslucencyInput
{
	float Scale;
	float NormalDistortion;
	float Scattering;
	float Thickness;
    float Ambient;
	half3 Color;
	float Shadow;
};

half3 Translucency(
	TranslucencyInput input,
	float3 bakedGI,
	float3 surfaceAlbedo,
	float3 surfaceNormal, 
	float3 viewDirectionWS, 
	Light light ) 
{
	half3 lightDir = light.direction + surfaceNormal * input.NormalDistortion;
	half transVdotL = 
		pow( saturate( dot( viewDirectionWS, -lightDir ) ), input.Scattering ) * input.Scale;
	half3 translucency = 
		(transVdotL + bakedGI * input.Ambient) 
			* (1-input.Thickness) 
			* lerp(1, light.shadowAttenuation, input.Shadow)
			* light.distanceAttenuation;

	return half3( surfaceAlbedo * light.color * translucency * input.Color );
}