BurleyNormalizedSSS.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
BurleyNormalizedSSS.h: Compute the transmission profile and convert parameters
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
 
// @param TargetBuffer, needs to be preallocated with TargetBufferSize (RGB is the sample weight, A is the offset), [0] is the center samples, following elements need to be mirrored with A, -A
// @param TargetBufferSize >0
// @parma FalloffColor see SubsurfaceProfile.h
// @parma SurfaceAlbedo see SubsurfaceProfile.h
// @parma DiffuseMeanFreePath mean free path color scaled by mean free path distance (in mm).
// @param WorldUnitScale see SubsurfaceProfile.h
// @param TransmissionTintColor see SubsurfaceProfile.h
void ComputeTransmissionProfileBurley(FLinearColor* TargetBuffer, uint32 TargetBufferSize, 
                                    FLinearColor FalloffColor, float ExtinctionScale,
                                    FLinearColor SurfaceAlbedo, FLinearColor DiffuseMeanFreePath, 
                                    float WorldUnitScale,FLinearColor TransmissionTintColor);
 
// Compute the Separable Kernel using Burley profile
void ComputeMirroredBSSSKernel(FLinearColor* TargetBuffer, uint32 TargetBufferSize, FLinearColor SurfaceAlbedo,
    FLinearColor DiffuseMeanFreePath, float ScatterRadius);
 
//@param FalloffColor from Separable SSS
//@param SurfaceAlbedo mapped from FallofColor 
//@param DiffuseMeanFreePath mapped from FallofColor
void MapFallOffColor2SurfaceAlbedoAndDiffuseMeanFreePath(float FalloffColor, float& SurfaceAlbedo, float& DiffuseMeanFreePath);
 
FLinearColor GetMeanFreePathFromDiffuseMeanFreePath(FLinearColor SurfaceAlbedo, FLinearColor DiffuseMeanFreePath);
FLinearColor GetDiffuseMeanFreePathFromMeanFreePath(FLinearColor SurfaceAlbedo, FLinearColor MeanFreePath);