Describes material's BSDF (Bidirectional Scattering Distribution Function) used for physically-based rendering (in path tracing engine). BSDF is represented as weighted mixture of basic BRDFs/BTDFs (Bidirectional Reflectance (Transmittance) Distribution Functions). More...

#include <Graphic3d_BSDF.hxx>

Public Member Functions
	Graphic3d_BSDF ()
	Creates uninitialized BSDF.

void	Normalize ()
	Normalizes BSDF components.

bool	operator== (const Graphic3d_BSDF &theOther) const
	Performs comparison of two BSDFs.

void	DumpJson (Standard_OStream &theOStream, int theDepth=-1) const
	Dumps the content of me into the stream.

Static Public Member Functions
static Graphic3d_BSDF	CreateDiffuse (const NCollection_Vec3< float > &theWeight)
	Creates BSDF describing diffuse (Lambertian) surface.

static Graphic3d_BSDF	CreateMetallic (const NCollection_Vec3< float > &theWeight, const Graphic3d_Fresnel &theFresnel, const float theRoughness)
	Creates BSDF describing polished metallic-like surface.

static Graphic3d_BSDF	CreateTransparent (const NCollection_Vec3< float > &theWeight, const NCollection_Vec3< float > &theAbsorptionColor, const float theAbsorptionCoeff)
	Creates BSDF describing transparent object. Transparent BSDF models simple transparency without refraction (the ray passes straight through the surface).

static Graphic3d_BSDF	CreateGlass (const NCollection_Vec3< float > &theWeight, const NCollection_Vec3< float > &theAbsorptionColor, const float theAbsorptionCoeff, const float theRefractionIndex)
	Creates BSDF describing glass-like object. Glass-like BSDF mixes refraction and reflection effects at grazing angles using physically-based Fresnel dielectric model.

static Graphic3d_BSDF	CreateMetallicRoughness (const Graphic3d_PBRMaterial &thePbr)
	Creates BSDF from PBR metallic-roughness material.

Data Fields
NCollection_Vec4< float >	Kc
	Weight of coat specular/glossy BRDF.

NCollection_Vec3< float >	Kd
	Weight of base diffuse BRDF.

NCollection_Vec4< float >	Ks
	Weight of base specular/glossy BRDF.

NCollection_Vec3< float >	Kt
	Weight of base specular/glossy BTDF.

NCollection_Vec3< float >	Le
	Radiance emitted by the surface.

NCollection_Vec4< float >	Absorption
	Volume scattering color/density.

Graphic3d_Fresnel	FresnelCoat
	Parameters of Fresnel reflectance of coat layer.

Graphic3d_Fresnel	FresnelBase
	Parameters of Fresnel reflectance of base layer.

Detailed Description

Describes material's BSDF (Bidirectional Scattering Distribution Function) used for physically-based rendering (in path tracing engine). BSDF is represented as weighted mixture of basic BRDFs/BTDFs (Bidirectional Reflectance (Transmittance) Distribution Functions).

NOTE: OCCT uses two-layer material model. We have base diffuse, glossy, or transmissive layer, covered by one glossy/specular coat. In the current model, the layers themselves have no thickness; they can simply reflect light or transmits it to the layer under it. We use actual BRDF model only for direct reflection by the coat layer. For transmission through this layer, we approximate it as a flat specular surface.

Constructor & Destructor Documentation

◆ Graphic3d_BSDF()

Graphic3d_BSDF::Graphic3d_BSDF ( )

Creates uninitialized BSDF.

Member Function Documentation

◆ CreateDiffuse()

static Graphic3d_BSDF Graphic3d_BSDF::CreateDiffuse ( const NCollection_Vec3< float > & theWeight )

static

Creates BSDF describing diffuse (Lambertian) surface.

◆ CreateGlass()

static Graphic3d_BSDF Graphic3d_BSDF::CreateGlass	(	const NCollection_Vec3< float > &	theWeight,
		const NCollection_Vec3< float > &	theAbsorptionColor,
		const float	theAbsorptionCoeff,
		const float	theRefractionIndex )

static

Creates BSDF describing glass-like object. Glass-like BSDF mixes refraction and reflection effects at grazing angles using physically-based Fresnel dielectric model.

◆ CreateMetallic()

static Graphic3d_BSDF Graphic3d_BSDF::CreateMetallic	(	const NCollection_Vec3< float > &	theWeight,
		const Graphic3d_Fresnel &	theFresnel,
		const float	theRoughness )

static

Creates BSDF describing polished metallic-like surface.

◆ CreateMetallicRoughness()

static Graphic3d_BSDF Graphic3d_BSDF::CreateMetallicRoughness ( const Graphic3d_PBRMaterial & thePbr )

static

Creates BSDF from PBR metallic-roughness material.

◆ CreateTransparent()

static Graphic3d_BSDF Graphic3d_BSDF::CreateTransparent	(	const NCollection_Vec3< float > &	theWeight,
		const NCollection_Vec3< float > &	theAbsorptionColor,
		const float	theAbsorptionCoeff )

static

Creates BSDF describing transparent object. Transparent BSDF models simple transparency without refraction (the ray passes straight through the surface).