#include <RixShadingBuiltin.h>

Inherits RixVolumeIntegrator.

Classes
struct	Params

Public Types
enum	VolumeProperty { k_DensityType, k_DensityFloat, k_DensityColor, k_MaxDensity, k_Velocity, k_NontemporalDensityFloat, k_NontemporalDensityColor, k_DensityFloatId, k_DensityColorId, k_Emission, k_ShadowDensityMultiplier }

Public Member Functions
	RixSSDiffusion (RixShadingContext const sCtx, RixBxdfFactory f, void *_instanceData)

virtual void	GetNearestHits (int nRays, RtRayGeometry const rays, RixRNG rng, RixBXLobeTraits const &lobesWanted, RixIntegratorContext &iCtx, RixLightingServices lightingServices, IntegratorDelegate lcb, int numShadingCtxs, RixShadingContext const *shadingCtxs, RtUString const subset=US_NULL, RtUString const excludeSubset=US_NULL, bool isLightPath=false, RtHitSides hitSides=k_SidesBoth, bool isPrimary=false)=0

RixShadingContext const *	GetShadingCtx () const
	Interfaces to obtain the shading context is slightly different for volume integrators compared with bxdfs. More...

RixShadingContext *	GetVolumeShadingCtx () const
	Interfaces to obtain the shading context is slightly different for volume integrators compared with bxdfs. More...

RixBxdfFactory *	GetBxdfFactory () const

void	SetBxdfFactory (RixBxdfFactory *factory)
	This method should be used with caution. More...

void *	GetInstanceData () const

void	SetInstanceData (void *data)
	This method should be used with caution. More...

virtual void	SetParameters (void const *subclassParams)

virtual void	Release ()

virtual RixSCDetail	GetProperty (VolumeProperty, void const **) const
	Volumes can be queried for general material properties to facilitate integration tasks. More...

RixShadingContext *	BeginVolumeSampling ()
	BeginVolumeSampling can be called by a volume integrator to obtain a mutable shading context for the purposes of sampling its volume region. More...

RixShadingContext const *	EndVolumeSampling (RixBXLobeTraits const exposeVol=NULL, int const membership=NULL)

virtual void	GetTransmission (int numRays, RtRayGeometry const rays, RixRNG rng, RixIntegratorContext &iCtx, RtColorRGB transmissions, RtColorRGB emission, RtUString const subset=US_NULL, RtUString const excludeSubset=US_NULL)
	We provide a default implementation of GetTransmission because some volume integrators may be opaque to transmission rays. More...

Protected Member Functions
virtual	~RixSSDiffusion ()
	for internal use only. More...

Protected Attributes
RixBxdfFactory *	bxdfFactory

void *	instanceData

void const *	params

Member Enumeration Documentation

enum RixVolumeIntegrator::VolumeProperty

inherited

See Also: GetProperty

Enumerator
k_DensityType	int - value should be one of k_DensityFloat/k_DensityColor
k_DensityFloat	float
k_DensityColor	RtColorRGB.
k_MaxDensity	float
k_Velocity	RtFloat3.
k_NontemporalDensityFloat	float
k_NontemporalDensityColor	RtColorRGB.
k_DensityFloatId	param id for float density
k_DensityColorId	param id for color density
k_Emission	RtColorRGB.
k_ShadowDensityMultiplier	float

Constructor & Destructor Documentation

RixSSDiffusion::RixSSDiffusion	(	RixShadingContext const *	sCtx,
		RixBxdfFactory *	f,
		void *	_instanceData
	)

inline

virtual RixSSDiffusion::~RixSSDiffusion ( )

inlineprotectedvirtual

for internal use only.

Member Function Documentation

RixShadingContext* RixVolumeIntegrator::BeginVolumeSampling ( )

inlineinherited

BeginVolumeSampling can be called by a volume integrator to obtain a mutable shading context for the purposes of sampling its volume region.

The resulting shading context has the same size as its creator context. Two options for cleanup are offered. If the volume integrator wishes to expose/publicize a new shading context to the primary integrator, it should set exposeVol to a non-NULL RixBXLobeTraits pointer (which usually points to the same RixBXLobeTraits passed to the interior's GetNearestHits method). The optional membership array can be used to communicate the subset of points on the current shading context that should be conveyed to the new one. A non-zero value signals the membership request in a new context. If NULL, all points will be used to construct a new shading context. In this usage, the return result will be a distinct shading context appropriate for use by the primary integrator. If exposeVol is NULL, the the result is NULL and internal volume sampling state is released.

References RixShadingContext::BeginVolumeSampling(), and RixVolumeIntegrator::GetShadingCtx().

RixShadingContext const* RixVolumeIntegrator::EndVolumeSampling	(	RixBXLobeTraits const *	exposeVol = `NULL`,
		int const *	membership = `NULL`
	)

inlineinherited

See Also: BeginVolumeSampling

References RixShadingContext::EndVolumeSampling(), and RixVolumeIntegrator::GetShadingCtx().

RixBxdfFactory* RixVolumeIntegrator::GetBxdfFactory ( ) const

inlineinherited

References RixVolumeIntegrator::bxdfFactory.

void* RixVolumeIntegrator::GetInstanceData ( ) const

inlineinherited

References RixVolumeIntegrator::instanceData.

virtual void RixSSDiffusion::GetNearestHits	(	int	nRays,
		RtRayGeometry const *	rays,
		RixRNG *	rng,
		RixBXLobeTraits const &	lobesWanted,
		RixIntegratorContext &	iCtx,
		RixLightingServices *	lightingServices,
		IntegratorDelegate *	lcb,
		int *	numShadingCtxs,
		RixShadingContext const **	shadingCtxs,
		RtUString const	subset = `US_NULL`,
		RtUString const	excludeSubset = `US_NULL`,
		bool	isLightPath = `false`,
		RtHitSides	hitSides = `k_SidesBoth`,
		bool	isPrimary = `false`
	)

pure virtual

Implements RixVolumeIntegrator.

virtual RixSCDetail RixVolumeIntegrator::GetProperty	(	VolumeProperty	,
		void const **
	)		const

inlinevirtualinherited

Volumes can be queried for general material properties to facilitate integration tasks.

Volumes should return k_RixSCInvalidDetail if a particular property is unsupported. If a property is supported the volume should return k_RixSCUniform or k_RixSCVarying according to the detail of the result.

References k_RixSCInvalidDetail.

RixShadingContext const* RixVolumeIntegrator::GetShadingCtx ( ) const

inlineinherited

Interfaces to obtain the shading context is slightly different for volume integrators compared with bxdfs.

There are two contexts for shading contexts; one representing the volume "surface" (the interface for the volume) and one for the volume interior. The surface context can be obtained by using GetShadingCtx. The returned context can never be NULL. To obtain a shading context for volume interiors, use GetVolumeShadingCtx.

Referenced by RixVolumeIntegrator::BeginVolumeSampling(), and RixVolumeIntegrator::EndVolumeSampling().

virtual void RixVolumeIntegrator::GetTransmission	(	int	numRays,
		RtRayGeometry const *	rays,
		RixRNG *	rng,
		RixIntegratorContext &	iCtx,
		RtColorRGB *	transmissions,
		RtColorRGB *	emission,
		RtUString const	subset = `US_NULL`,
		RtUString const	excludeSubset = `US_NULL`
	)

inlinevirtualinherited

We provide a default implementation of GetTransmission because some volume integrators may be opaque to transmission rays.

This occurs when the only supported light transport mode is indirect. In this case, the volume integrator's associated bxdffactory may select to return a NULL volume integrator for transmission queries.

RixShadingContext* RixVolumeIntegrator::GetVolumeShadingCtx ( ) const

inlineinherited

Interfaces to obtain the shading context is slightly different for volume integrators compared with bxdfs.

There are two contexts for shading contexts; one representing the volume "surface" (the interface for the volume) and one for the volume interior. The surface context can be obtained by using GetShadingCtx. The returned context can never be NULL. To obtain a shading context for volume interiors, use GetVolumeShadingCtx.

virtual void RixVolumeIntegrator::Release ( )

inlinevirtualinherited

References RixVolumeIntegrator::bxdfFactory, and RixBxdfFactory::EndInterior().

void RixVolumeIntegrator::SetBxdfFactory ( RixBxdfFactory * factory)

inlineinherited

This method should be used with caution.

In most circumstances, the factory that is set by the constructor should suffice and should not need to be overriden. The only known situation which requires the use of this method involves nested Bxdfs, when an outer RixBxdfFactory's implementation of BeginInterior delegates to a nested inner RixBxdfFactory's implementation of BeginInterior. In this situation, it may be appropriate for the outer RixBxdfFactory to override the volume integrator's bxdf factory with this method, in order to guarantee that the renderer can correctly find the outer RixBxdfFactory for calls to BeginScatter().

RixVolumeIntegrator* OuterFactory::BeginInterior(...) {
    RixBxdfFactory* innerFactory = ...;
    RixVolumeIntegrator* integrator = innerFactory->BeginInterior(...);
    if (integrator) {
        integrator->SetBxdfFactory(this); // factory override
    }
    return integrator;
}