A ParticleField related applied schema that provides spherical harmonics attributes to define the radiance of the particles. More...

#include <particleFieldSphericalHarmonicsAttributeAPI.h>

Inheritance diagram for UsdVolParticleFieldSphericalHarmonicsAttributeAPI:

Public Member Functions
	UsdVolParticleFieldSphericalHarmonicsAttributeAPI (const UsdPrim &prim=UsdPrim())
	Construct a UsdVolParticleFieldSphericalHarmonicsAttributeAPI on UsdPrim `prim` .

	UsdVolParticleFieldSphericalHarmonicsAttributeAPI (const UsdSchemaBase &schemaObj)
	Construct a UsdVolParticleFieldSphericalHarmonicsAttributeAPI on the prim held by `schemaObj` .

virtual USDVOL_API	~UsdVolParticleFieldSphericalHarmonicsAttributeAPI ()
	Destructor.

USDVOL_API UsdAttribute	GetRadianceSphericalHarmonicsDegreeAttr () const
	The highest degree of the spherical harmonics.

USDVOL_API UsdAttribute	CreateRadianceSphericalHarmonicsDegreeAttr (VtValue const &defaultValue=VtValue(), bool writeSparsely=false) const
	See GetRadianceSphericalHarmonicsDegreeAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

USDVOL_API UsdAttribute	GetRadianceSphericalHarmonicsCoefficientsAttr () const
	Flattened array of SH coefficients.

USDVOL_API UsdAttribute	CreateRadianceSphericalHarmonicsCoefficientsAttr (VtValue const &defaultValue=VtValue(), bool writeSparsely=false) const
	See GetRadianceSphericalHarmonicsCoefficientsAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

USDVOL_API UsdAttribute	GetRadianceSphericalHarmonicsCoefficientshAttr () const
	Flattened array of SH coefficients.

USDVOL_API UsdAttribute	CreateRadianceSphericalHarmonicsCoefficientshAttr (VtValue const &defaultValue=VtValue(), bool writeSparsely=false) const
	See GetRadianceSphericalHarmonicsCoefficientshAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

ParticleFieldRadianceBaseAPI
Convenience accessors for the built-in UsdVolParticleFieldRadianceBaseAPI
USDVOL_API UsdVolParticleFieldRadianceBaseAPI	ParticleFieldRadianceBaseAPI () const
	Constructs and returns a UsdVolParticleFieldRadianceBaseAPI object.

Public Member Functions inherited from UsdAPISchemaBase
	UsdAPISchemaBase (const UsdPrim &prim=UsdPrim())
	Construct a UsdAPISchemaBase on UsdPrim `prim` .

	UsdAPISchemaBase (const UsdSchemaBase &schemaObj)
	Construct a UsdAPISchemaBase on the prim held by `schemaObj` .

virtual USD_API	~UsdAPISchemaBase ()=0
	Destructor.

Public Member Functions inherited from UsdSchemaBase
bool	IsConcrete () const
	Returns whether or not this class corresponds to a concrete instantiable prim type in scene description.

bool	IsTyped () const
	Returns whether or not this class inherits from UsdTyped.

bool	IsAPISchema () const
	Returns whether this is an API schema or not.

bool	IsAppliedAPISchema () const
	Returns whether this is an applied API schema or not.

bool	IsMultipleApplyAPISchema () const
	Returns whether this is an applied API schema or not.

UsdSchemaKind	GetSchemaKind () const
	Returns the kind of schema this class is.

USD_API	UsdSchemaBase (const UsdPrim &prim=UsdPrim())
	Construct and store `prim` as the held prim.

USD_API	UsdSchemaBase (const UsdSchemaBase &otherSchema)
	Construct and store for the same prim held by `otherSchema`.

virtual USD_API	~UsdSchemaBase ()
	Destructor.

UsdPrim	GetPrim () const
	Return this schema object's held prim.

SdfPath	GetPath () const
	Shorthand for GetPrim()->GetPath().

USD_API const UsdPrimDefinition *	GetSchemaClassPrimDefinition () const
	Return the prim definition associated with this schema instance if one exists, otherwise return null.

USD_API	operator bool () const
	Return true if this schema object is compatible with its held prim, false otherwise.

Static Public Member Functions
static USDVOL_API const TfTokenVector &	GetSchemaAttributeNames (bool includeInherited=true)
	Return a vector of names of all pre-declared attributes for this schema class and all its ancestor classes.

static USDVOL_API UsdVolParticleFieldSphericalHarmonicsAttributeAPI	Get (const UsdStagePtr &stage, const SdfPath &path)
	Return a UsdVolParticleFieldSphericalHarmonicsAttributeAPI holding the prim adhering to this schema at `path` on `stage`.

static USDVOL_API bool	CanApply (const UsdPrim &prim, std::string *whyNot=nullptr)
	Returns true if this single-apply API schema can be applied to the given `prim`.

static USDVOL_API UsdVolParticleFieldSphericalHarmonicsAttributeAPI	Apply (const UsdPrim &prim)
	Applies this single-apply API schema to the given `prim`.

Static Public Member Functions inherited from UsdAPISchemaBase
static USD_API const TfTokenVector &	GetSchemaAttributeNames (bool includeInherited=true)
	Return a vector of names of all pre-declared attributes for this schema class and all its ancestor classes.

Static Public Member Functions inherited from UsdSchemaBase
static const TfTokenVector &	GetSchemaAttributeNames (bool includeInherited=true)

Static Public Attributes
static const UsdSchemaKind	schemaKind = UsdSchemaKind::SingleApplyAPI
	Compile time constant representing what kind of schema this class is.

Static Public Attributes inherited from UsdAPISchemaBase
static const UsdSchemaKind	schemaKind = UsdSchemaKind::AbstractBase
	Compile time constant representing what kind of schema this class is.

Static Public Attributes inherited from UsdSchemaBase
static const UsdSchemaKind	schemaKind = UsdSchemaKind::AbstractBase
	Compile time constant representing what kind of schema this class is.

Protected Member Functions
USDVOL_API UsdSchemaKind	_GetSchemaKind () const override
	Returns the kind of schema this class belongs to.

Protected Member Functions inherited from UsdAPISchemaBase
USD_API UsdSchemaKind	_GetSchemaKind () const override
	Returns the kind of schema this class belongs to.

	UsdAPISchemaBase (const UsdPrim &prim, const TfToken &instanceName)
	Construct a multiple-apply UsdAPISchemaBase on UsdPrim `prim` with the specified `instanceName`.

	UsdAPISchemaBase (const UsdSchemaBase &schemaObj, const TfToken &instanceName)
	Construct a multiple-apply UsdAPISchemaBase on the prim held by `schemaObj` with the given `instanceName`.

const TfToken &	_GetInstanceName () const
	Returns the instance name of the API schema object belonging to a multiple-apply API schema.

USD_API bool	_IsCompatible () const override
	Check whether this APISchema object is valid for the currently held prim.

Protected Member Functions inherited from UsdSchemaBase
virtual UsdSchemaKind	_GetSchemaType () const

const TfType &	_GetType () const

USD_API UsdAttribute	_CreateAttr (TfToken const &attrName, SdfValueTypeName const &typeName, bool custom, SdfVariability variability, VtValue const &defaultValue, bool writeSparsely) const

Friends
class	UsdSchemaRegistry

Additional Inherited Members
Static Protected Member Functions inherited from UsdAPISchemaBase
static USD_API TfTokenVector	_GetMultipleApplyInstanceNames (const UsdPrim &prim, const TfType &schemaType)
	Returns a vector of names of API schema objects belonging to a multiple-apply API schema applied to a given prim.

Detailed Description

A ParticleField related applied schema that provides spherical harmonics attributes to define the radiance of the particles.

The spherical harmonics degree is constant across all the particles in the ParticleField.

Attributes are provided in both float and half types for some easy data footprint affordance, data consumers should prefer float version if available.

The length of this attribute is expected to match the length of the provided position data times the per-particle elementSize derived from the SH degree (specifically elementSize = (degree+1)*(degree+1)). If it is too long it will be truncated to the number of particles define by the position data. If it is too short it will be ignored.

If it is ignored or not populated, the particle should use a SH coefficient corresponding to a DC signal of (0.5, 0.5, 0.5), with degree 0.

Definition at line 63 of file particleFieldSphericalHarmonicsAttributeAPI.h.

Constructor & Destructor Documentation

◆ UsdVolParticleFieldSphericalHarmonicsAttributeAPI() [1/2]

UsdVolParticleFieldSphericalHarmonicsAttributeAPI ( const UsdPrim & prim = UsdPrim() )

inlineexplicit

Construct a UsdVolParticleFieldSphericalHarmonicsAttributeAPI on UsdPrim prim .

Equivalent to UsdVolParticleFieldSphericalHarmonicsAttributeAPI::Get(prim.GetStage(), prim.GetPath()) for a valid prim, but will not immediately throw an error for an invalid prim

Definition at line 75 of file particleFieldSphericalHarmonicsAttributeAPI.h.

◆ UsdVolParticleFieldSphericalHarmonicsAttributeAPI() [2/2]

UsdVolParticleFieldSphericalHarmonicsAttributeAPI ( const UsdSchemaBase & schemaObj )

inlineexplicit

Construct a UsdVolParticleFieldSphericalHarmonicsAttributeAPI on the prim held by schemaObj .

Should be preferred over UsdVolParticleFieldSphericalHarmonicsAttributeAPI(schemaObj.GetPrim()), as it preserves SchemaBase state.

Definition at line 83 of file particleFieldSphericalHarmonicsAttributeAPI.h.

◆ ~UsdVolParticleFieldSphericalHarmonicsAttributeAPI()

virtual USDVOL_API ~UsdVolParticleFieldSphericalHarmonicsAttributeAPI ( )

virtual

Destructor.

Member Function Documentation

◆ _GetSchemaKind()

USDVOL_API UsdSchemaKind _GetSchemaKind ( ) const

overrideprotectedvirtual

Returns the kind of schema this class belongs to.

See also: UsdSchemaKind

Reimplemented from UsdAPISchemaBase.

◆ Apply()

static USDVOL_API UsdVolParticleFieldSphericalHarmonicsAttributeAPI Apply ( const UsdPrim & prim )

static

Applies this single-apply API schema to the given prim.

This information is stored by adding "ParticleFieldSphericalHarmonicsAttributeAPI" to the token-valued, listOp metadata apiSchemas on the prim.

Returns: A valid UsdVolParticleFieldSphericalHarmonicsAttributeAPI object is returned upon success. An invalid (or empty) UsdVolParticleFieldSphericalHarmonicsAttributeAPI object is returned upon failure. See UsdPrim::ApplyAPI() for conditions resulting in failure.

See also: UsdPrim::GetAppliedSchemas(); UsdPrim::HasAPI(); UsdPrim::CanApplyAPI(); UsdPrim::ApplyAPI(); UsdPrim::RemoveAPI()

◆ CanApply()

static USDVOL_API bool CanApply	(	const UsdPrim &	prim,
		std::string *	whyNot = `nullptr`
	)

static

Returns true if this single-apply API schema can be applied to the given prim.

If this schema can not be a applied to the prim, this returns false and, if provided, populates whyNot with the reason it can not be applied.

Note that if CanApply returns false, that does not necessarily imply that calling Apply will fail. Callers are expected to call CanApply before calling Apply if they want to ensure that it is valid to apply a schema.

See also: UsdPrim::GetAppliedSchemas(); UsdPrim::HasAPI(); UsdPrim::CanApplyAPI(); UsdPrim::ApplyAPI(); UsdPrim::RemoveAPI()

◆ CreateRadianceSphericalHarmonicsCoefficientsAttr()

USDVOL_API UsdAttribute CreateRadianceSphericalHarmonicsCoefficientsAttr	(	VtValue const &	defaultValue = `VtValue()`,
		bool	writeSparsely = `false`
	)		const

See GetRadianceSphericalHarmonicsCoefficientsAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

If specified, author defaultValue as the attribute's default, sparsely (when it makes sense to do so) if writeSparsely is true - the default for writeSparsely is false.

◆ CreateRadianceSphericalHarmonicsCoefficientshAttr()

USDVOL_API UsdAttribute CreateRadianceSphericalHarmonicsCoefficientshAttr	(	VtValue const &	defaultValue = `VtValue()`,
		bool	writeSparsely = `false`
	)		const

See GetRadianceSphericalHarmonicsCoefficientshAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

If specified, author defaultValue as the attribute's default, sparsely (when it makes sense to do so) if writeSparsely is true - the default for writeSparsely is false.

◆ CreateRadianceSphericalHarmonicsDegreeAttr()

USDVOL_API UsdAttribute CreateRadianceSphericalHarmonicsDegreeAttr	(	VtValue const &	defaultValue = `VtValue()`,
		bool	writeSparsely = `false`
	)		const

See GetRadianceSphericalHarmonicsDegreeAttr(), and also Create vs Get Property Methods for when to use Get vs Create.

If specified, author defaultValue as the attribute's default, sparsely (when it makes sense to do so) if writeSparsely is true - the default for writeSparsely is false.

◆ Get()

static USDVOL_API UsdVolParticleFieldSphericalHarmonicsAttributeAPI Get	(	const UsdStagePtr &	stage,
		const SdfPath &	path
	)

static

Return a UsdVolParticleFieldSphericalHarmonicsAttributeAPI holding the prim adhering to this schema at path on stage.

If no prim exists at path on stage, or if the prim at that path does not adhere to this schema, return an invalid schema object. This is shorthand for the following:

UsdVolParticleFieldSphericalHarmonicsAttributeAPI(stage->GetPrimAtPath(path));

UsdVolParticleFieldSphericalHarmonicsAttributeAPI

A ParticleField related applied schema that provides spherical harmonics attributes to define the rad...

Definition: particleFieldSphericalHarmonicsAttributeAPI.h:64

◆ GetRadianceSphericalHarmonicsCoefficientsAttr()

USDVOL_API UsdAttribute GetRadianceSphericalHarmonicsCoefficientsAttr ( ) const

Flattened array of SH coefficients.

The SH coefficients are grouped in the array by particle, meaning each particle has N contiguous coefficients, Y(m,l) sorted first by order (m) and then within the order by index (l). A renderer can compute an element size per particle based on the SH degree, and use that to stripe the array by particle.


Declaration	`float3[] radiance:sphericalHarmonicsCoefficients`
C++ Type	VtArray<GfVec3f>
Usd Type	SdfValueTypeNames->Float3Array

◆ GetRadianceSphericalHarmonicsCoefficientshAttr()

USDVOL_API UsdAttribute GetRadianceSphericalHarmonicsCoefficientshAttr ( ) const

Flattened array of SH coefficients.

The SH coefficients are grouped in the array by particle, meaning each particle has N contiguous coefficients, Y(m,l) sorted first by order (m) and then within the order by index (l). A renderer can compute an element size per particle based on the SH degree, and use that to stripe the array by particle.

If the float precision version is available it should be preferred.


Declaration	`half3[] radiance:sphericalHarmonicsCoefficientsh`
C++ Type	VtArray<GfVec3h>
Usd Type	SdfValueTypeNames->Half3Array

◆ GetRadianceSphericalHarmonicsDegreeAttr()

USDVOL_API UsdAttribute GetRadianceSphericalHarmonicsDegreeAttr ( ) const

The highest degree of the spherical harmonics.

A degree of N implies a coefficient element size (per particle) of (N+1)*(N+1) values. The spherical harmonics degree is the same for all particles in the ParticleField.


Declaration	`uniform int radiance:sphericalHarmonicsDegree = 3`
C++ Type	int
Usd Type	SdfValueTypeNames->Int
Variability	SdfVariabilityUniform

◆ GetSchemaAttributeNames()

static USDVOL_API const TfTokenVector & GetSchemaAttributeNames ( bool includeInherited = true )

static

Return a vector of names of all pre-declared attributes for this schema class and all its ancestor classes.

Does not include attributes that may be authored by custom/extended methods of the schemas involved.

◆ ParticleFieldRadianceBaseAPI()

USDVOL_API UsdVolParticleFieldRadianceBaseAPI ParticleFieldRadianceBaseAPI ( ) const

Constructs and returns a UsdVolParticleFieldRadianceBaseAPI object.

Use this object to access UsdVolParticleFieldRadianceBaseAPI custom methods.

Friends And Related Function Documentation

◆ UsdSchemaRegistry

friend class UsdSchemaRegistry

friend

Definition at line 161 of file particleFieldSphericalHarmonicsAttributeAPI.h.

Member Data Documentation

◆ schemaKind

const UsdSchemaKind schemaKind = UsdSchemaKind::SingleApplyAPI

static

Compile time constant representing what kind of schema this class is.

See also: UsdSchemaKind

Definition at line 69 of file particleFieldSphericalHarmonicsAttributeAPI.h.

The documentation for this class was generated from the following file:

pxr/usd/usdVol/particleFieldSphericalHarmonicsAttributeAPI.h

Public Member Functions

Static Public Member Functions

Static Public Attributes

Protected Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ UsdVolParticleFieldSphericalHarmonicsAttributeAPI() [1/2]

◆ UsdVolParticleFieldSphericalHarmonicsAttributeAPI() [2/2]

◆ ~UsdVolParticleFieldSphericalHarmonicsAttributeAPI()

Member Function Documentation

◆ _GetSchemaKind()

◆ Apply()

◆ CanApply()

◆ CreateRadianceSphericalHarmonicsCoefficientsAttr()

◆ CreateRadianceSphericalHarmonicsCoefficientshAttr()

◆ CreateRadianceSphericalHarmonicsDegreeAttr()

◆ Get()

◆ GetRadianceSphericalHarmonicsCoefficientsAttr()

◆ GetRadianceSphericalHarmonicsCoefficientshAttr()

◆ GetRadianceSphericalHarmonicsDegreeAttr()

◆ GetSchemaAttributeNames()

◆ ParticleFieldRadianceBaseAPI()

Friends And Related Function Documentation

◆ UsdSchemaRegistry

Member Data Documentation

◆ schemaKind