Sub-Surface Scattering API

SSS utility functions. More...

Functions
AI_API void	AiBSSRDFEmpirical (const AtShaderGlobals *sg, AtRGB &direct, AtRGB &indirect, const float *mfp, const float *albedo, const AtRGB *weight, unsigned int num=1)
	Calculate direct and indirectly lit SSS using an BSSRDF model that was empirically fitted to match brute-force Monte Carlo scattering. More...
AI_API AI_PURE bool	AiShaderGlobalsFromSSS (const AtShaderGlobals *sg)

Detailed Description

SSS utility functions.

Function Documentation

AiBSSRDFEmpirical()

AI_API void AiBSSRDFEmpirical	(	const AtShaderGlobals *	sg,
		AtRGB &	direct,
		AtRGB &	indirect,
		const float *	mfp,
		const float *	albedo,
		const AtRGB *	weight,
		unsigned int	num
	)

Calculate direct and indirectly lit SSS using an BSSRDF model that was empirically fitted to match brute-force Monte Carlo scattering.

This BSSRDF accounts for both single and multiple scattering.

Note that Fresnel or other layer or mixing weights must be provided separately from the albedo in the weights array, as the albedo affects the shape of the BSSRDF profile.

BSSRDF sampling quality is controlled by the GI_sss_samples render option.

Note

Deprecated, use AiClosureEmpiricalBSSRDF instead.

Deprecated, use shader closures instead of integrating light in shaders.

Parameters

	sg	shader globals to perform the lookup at
[out]	direct	variable returning the directly lit part of the result
[out]	indirect	variable returning the indirectly lit part of the result
	mfp	array of mean free path lengths (mfp = 1/sigmat' = 1/(sigmas' + sigmaa))
	albedo	array of diffuse reflectivities
	weight	array of weights for mixing profiles or applying fresnel
	num	number of elements in mfp and albedo arrays

Returns

nothing