usdrt::UsdVolOpenVDBAsset

Defined in usdrt/scenegraph/usd/usdVol/openVDBAsset.h

Functions

Variables

class UsdVolOpenVDBAsset : public usdrt::UsdVolFieldAsset

OpenVDB field primitive. The FieldAsset filePath attribute must specify a file in the OpenVDB format on disk. For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdVolTokens. So to set an attribute to the value “rightHanded”, use UsdVolTokens->rightHanded as the value.

Public Functions

inline explicit UsdVolOpenVDBAsset(const UsdPrim &prim = UsdPrim())

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

inline explicit UsdVolOpenVDBAsset(const UsdSchemaBase &schemaObj)

Construct a UsdVolOpenVDBAsset on the prim held by schemaObj . Should be preferred over UsdVolOpenVDBAsset(schemaObj.GetPrim()), as it preserves SchemaBase state.

inline virtual ~UsdVolOpenVDBAsset()

Destructor.

inline operator bool() const

Boolean operator.

Returns

Return true if the contained prim is an instance of this schema using IsA, and false otherwise.

inline UsdAttribute GetFieldDataTypeAttr() const

Token which is used to indicate the data type of an individual field. Authors use this to tell consumers more about the field without opening the file on disk. The list of allowed tokens reflects the available choices for OpenVDB volumes.

Declaration

token fieldDataType

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Allowed Values

half, float, double, int, uint, int64, half2, float2, double2, int2,

half3, float3, double3, int3, matrix3d, matrix4d, quatd, bool, mask, string |

inline UsdAttribute CreateFieldDataTypeAttr() const

See GetFieldDataTypeAttr(), 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.

inline UsdAttribute GetFieldClassAttr() const

Optional token which can be used to indicate the class of an individual grid. This is a mapping to openvdb::GridClass where the values are GRID_LEVEL_SET, GRID_FOG_VOLUME, GRID_STAGGERED, and GRID_UNKNOWN.

Declaration

token fieldClass

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Allowed Values

levelSet, fogVolume, staggered, unknown

inline UsdAttribute CreateFieldClassAttr() const

See GetFieldClassAttr(), 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.

inline UsdAttribute GetFilePathAttr() const

An asset path attribute that points to a file on disk. For each supported file format, a separate FieldAsset subclass is required.

This attribute’s value can be animated over time, as most volume asset formats represent just a single timeSample of a volume. However, it does not, at this time, support any pattern substitutions like “$F”.

Declaration

asset filePath

C++ Type

SdfAssetPath

Usd Type

SdfValueTypeNames->Asset

inline UsdAttribute CreateFilePathAttr() const

See GetFilePathAttr(), 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.

inline UsdAttribute GetFieldNameAttr() const

Name of an individual field within the file specified by the filePath attribute.

Declaration

token fieldName

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

inline UsdAttribute CreateFieldNameAttr() const

See GetFieldNameAttr(), 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.

inline UsdAttribute GetFieldIndexAttr() const

A file can contain multiple fields with the same name. This optional attribute is an index used to disambiguate between these multiple fields with the same name.

Declaration

int fieldIndex

C++ Type

int

Usd Type

SdfValueTypeNames->Int

inline UsdAttribute CreateFieldIndexAttr() const

See GetFieldIndexAttr(), 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.

inline UsdAttribute GetVectorDataRoleHintAttr() const

Optional token which is used to indicate the role of a vector valued field. This can drive the data type in which fields are made available in a renderer or whether the vector values are to be transformed.

Declaration

token vectorDataRoleHint = "None"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Allowed Values

None, Point, Normal, Vector, Color

inline UsdAttribute CreateVectorDataRoleHintAttr() const

See GetVectorDataRoleHintAttr(), 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.

inline UsdAttribute GetXformOpOrderAttr() const

Encodes the sequence of transformation operations in the order in which they should be pushed onto a transform stack while visiting a UsdStage’s prims in a graph traversal that will effect the desired positioning for this prim and its descendant prims.

You should rarely, if ever, need to manipulate this attribute directly. It is managed by the AddXformOp(), SetResetXformStack(), and SetXformOpOrder(), and consulted by GetOrderedXformOps() and GetLocalTransformation().

Declaration

uniform token[] xformOpOrder

C++ Type

VtArray<TfToken>

Usd Type

SdfValueTypeNames->TokenArray

Variability

SdfVariabilityUniform

inline UsdAttribute CreateXformOpOrderAttr() const

See GetXformOpOrderAttr(), 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.

inline UsdAttribute GetVisibilityAttr() const

Visibility is meant to be the simplest form of “pruning” visibility that is supported by most DCC apps. Visibility is animatable, allowing a sub-tree of geometry to be present for some segment of a shot, and absent from others; unlike the action of deactivating geometry prims, invisible geometry is still available for inspection, for positioning, for defining volumes, etc.

Declaration

token visibility = "inherited"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Allowed Values

inherited, invisible

inline UsdAttribute CreateVisibilityAttr() const

See GetVisibilityAttr(), 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.

inline UsdAttribute GetPurposeAttr() const

Purpose is a classification of geometry into categories that can each be independently included or excluded from traversals of prims on a stage, such as rendering or bounding-box computation traversals.

See UsdGeom_ImageablePurpose for more detail about how purpose is computed and used.

Declaration

uniform token purpose = "default"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

Allowed Values

default, render, proxy, guide

inline UsdAttribute CreatePurposeAttr() const

See GetPurposeAttr(), 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.

inline UsdRelationship GetProxyPrimRel() const

The proxyPrim relationship allows us to link a prim whose purpose is “render” to its (single target) purpose=”proxy” prim. This is entirely optional, but can be useful in several scenarios:

  • In a pipeline that does pruning (for complexity management) by deactivating prims composed from asset references, when we deactivate a purpose=”render” prim, we will be able to discover and additionally deactivate its associated purpose=”proxy” prim, so that preview renders reflect the pruning accurately.

  • DCC importers may be able to make more aggressive optimizations for interactive processing and display if they can discover the proxy for a given render prim.

  • With a little more work, a Hydra-based application will be able to map a picked proxy prim back to its render geometry for selection.

Note

It is only valid to author the proxyPrim relationship on prims whose purpose is “render”.

inline UsdRelationship CreateProxyPrimRel() const

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

UsdPrim GetPrim() const

Return this schema object’s held prim.

SdfPath GetPath() const

Return the SdfPath to this schema object’s held prim.

Public Static Functions

static inline UsdVolOpenVDBAsset Define(const UsdStageRefPtr &stage, const SdfPath &path)

Attempt to ensure a UsdPrim adhering to this schema at path is defined (according to UsdPrim::IsDefined()) on this stage.

Public Static Attributes

static const UsdSchemaType schemaType = UsdSchemaType::ConcreteTyped

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

See also

UsdSchemaType