UsdPrim#

Fully qualified name: usdrt::UsdPrim

class UsdPrim#

A UsdPrim is the principal container of other types of scene description. It provides API for accessing and creating all of the contained kinds of scene description.

Public Functions

bool HasAttribute(const TfToken &name) const#

Check if this prim has an attribute named name in Fabric. Does not check for attribute existence in the underlying USD stage.

Parameters:

name – The attribute name.

Returns:

Return true if the attribute exists on this prim, and false otherwise.

UsdAttribute GetAttribute(const TfToken &name) const#

Get the attribute named name if it exists in fabric. Does not check for attribute existence in the underlying USD stage.

Parameters:

name – The attribute name.

Returns:

Return the attribute on this prim with name name, or an invalid attribute object if not found.

std::vector<UsdAttribute> GetAttributes() const#

Get all attributes on this prim.

Note

Current implementation only returns attributes that exist in Fabric

Returns:

Return a vector of attributes that are on the prim.

std::vector<UsdAttribute> GetAuthoredAttributes() const#

Get all authored attributes on this prim.

Returns:

Return a vector of attributes that are authored on the prim.

UsdAttribute CreateAttribute(
const TfToken &name,
const SdfValueTypeName &typeName,
bool custom = true,
) const#

Create a new attribute on this prim in fabric.

TODO: SdfVariability parameter

Parameters:

  • name – The attribute name.

  • typeName – The type of the attribute.

  • custom – Indicate if the attribute is custom. Default is true. This currently does nothing as it is not represented in fabric.

Returns:

Return the new attribute.

bool HasRelationship(const TfToken &name) const#

Check if this prim has a relationship named name. Fabric is the ground truth for existence, so there is no USD fallback.

Parameters:

name – The relationship name.

Returns:

Return true if the relationship exists on this prim, and false otherwise.

UsdRelationship GetRelationship(const TfToken &name) const#

Get the relationship named name if it exists.

Note

Fabric does not yet support lists of targets for relationships.

Parameters:

name – The relationship name.

Returns:

Return the relationship on this prim with name name, or an invalid relationship object if not found.

std::vector<UsdRelationship> GetRelationships() const#

Get all relationships on this prim.

Note

Fabric does not yet support lists of targets for relationships.

Returns:

Return a vector of relationship that are on the prim.

std::vector<UsdRelationship> GetAuthoredRelationships() const#

Get all authored relationships on this prim.

Note

Fabric does not yet support lists of targets for relationships.

Returns:

Return a vector of relationships that are authored on the prim.

UsdRelationship CreateRelationship(
const TfToken &relName,
bool custom = true,
) const#

Create a new relationship on this prim in fabric.

Parameters:

  • relName – The relationship name.

  • custom – Indicate if the relationship is custom. Default is true. This currently does nothing as it is not represented in fabric.

Returns:

Return the new relationship.

bool RemoveProperty(const TfToken &name) const#

Remove property from this prim in fabric.

Parameters:

name – Name of the property to remove.

Returns:

Return true if the property was removed, and false otherwise.

TfTokenVector GetPropertyNames() const#

Get all of this prim’s properties (attributes and relationships). Includes build in properties.

Returns:

Return a TfTokenVector of property names.

TfTokenVector GetAuthoredPropertyNames() const#

Get all of this prim’s properties (attributes and relationships). Includes build in properties.

Note: Fabric doesn’t differientiate between authored properties, so this API is here for completeness but is the exact same as GetPropertyNames.

Returns:

Return a TfTokenVector of property names.

bool HasProperty(const TfToken &name) const#

Check if the prim has property name.

Parameters:

name – Property name

Returns:

True if this prim has property name.

bool IsValid() const#

Check if this is a valid prim. A prim is valid if it exists in fabric. This includes minimally populated prims.

Returns:

Return true if this prim is valid, and false otherwise.

UsdStageRefPtr GetStage() const#

Get the fabric stage holding this UsdPrim.

Returns:

Return a pointer to the fabric stage that contains this prim.

UsdPrim GetPrim() const#

UsdObject method required for UsdPrim to be a complete type.

Returns:

Return this prim.

const TfToken GetName() const#

Get the name of this prim.

Returns:

Return the name of this prim.

SdfPath GetPath() const#

Get the path to this prim.

Returns:

Returns the path to this prim.

const SdfPath GetPrimPath() const#

Get the path to this prim.

Returns:

Returns the path to this prim.

UsdPrim GetChild(const TfToken &name) const#

Get child prim name from this prim’s children.

Parameters:

name – The name of the child to look for.

Returns:

Return the child prim, or an invalid prim if not found.

std::vector<UsdPrim> GetChildren() const#

Get child prims of this prim. If fabric population / hierarchy is active, get child prims using the fabric Connectivity API. Otherwise, fall back to GetChildren in USD and load the prims into fabric.

Returns:

Return a vector containing all child prims of this prim.

TfTokenVector GetChildrenNames() const#

Get list of child prim names when iterating over GetChildren.

Returns:

TfTokenVector of child names.

std::vector<UsdPrim> GetAllChildren() const#

Get all child prims of this prim. If fabric population / hierarchy is active, get child prims using the fabric Connectivity API. Otherwise, fall back to GetChildren USD and load the prims into fabric.

Note

This differs from USD functionality. Same as GetChildren.

Returns:

Return a vector containing all child prims of this prim.

TfTokenVector GetAllChildrenNames() const#

Get list of child prim names when iterating over GetAllChildren.

Returns:

TfTokenVector of child names.

UsdPrim GetParent() const#

Get this prim’s parent prim.

Returns:

Return this prim’s parent prim.

UsdPrim GetNextSibling() const#

Get this prim’s next sibling in the scene hierarchy. If population is active, get next sibling using Connectivity. Otherwise fall back to USD.

Returns:

Return this prim’s next sibling if it has one. Otherwise return an invalid prim.

TfToken GetTypeName() const#

Get the type name for this prim. This looks for the attribute of type SdfValueTypeNames->PrimTypeTag in fabric.

Returns:

Return the prim type name.

bool SetTypeName(const TfToken &typeName) const#

Set this prim’s type name. This clears any existing type name and sets the attribute SdfValueTypeNames->PrimTypeTag in fabric to typeName.

Parameters:

typeName – Prim’s new type name to set.

Returns:

Return true if this prim’s type name has been updated. False otherwise.

bool ClearTypeName() const#

Clear this prim’s typename. This removes the attribute of type SdfValueTypeNames->PrimTypeTag from fabric.

Returns:

Return true if this prim’s type name has been cleared. False otherwise.

bool HasAuthoredTypeName() const#

Check if this prim has an authored typename. True if an attribute of type SdfValueTypeNames->PrimTypeTag has a value authored.

Returns:

Return true if this prim’s typename tag is authored, false otherwise.

template<typename SchemaType>
inline bool IsA() const#

Query if this prim’s type is or is a child type of SchemaType. An error will be issued if SchemaType is an unknown schema.

Template Parameters:

SchemaType – The schema type name or alias type.

Returns:

Return true if this prim is or is a child type of SchemaType.

bool IsA(const TfToken &schemaType) const#

Query if this prim’s type is or is a child type of SchemaType. An error will be issued if the schemaType is an unknown schema.

Parameters:

schemaType – The schema c++ type.

Returns:

Return true if this prim is or is a child type of SchemaType.

bool AddAppliedSchema(const TfToken &appliedSchemaName) const#

Apply schema of type appliedSchemaName. This authors an attribute of type SdfValueTypeNames->AppliedSchemaTypeTag with value appliedSchemaName. This method assumes:

  • input validation (if desired) has already been done by other API methods (UsdPrim::ApplyAPI).

  • the appliedSchemaName is the schema alias. For example: MotionAPI instead of UsdGeomMotionAPI. This is required for Fabric.

  • for multiple-apply schemas, appliedSchemaName contains both the namespace and instance name. For example: ‘CollectionAPI:myStuff’.

ApplyAPI is the preferred method for applying valid API schemas. Using ApplyAPI instead will convert schema names to alias and join namespace/instance names.

See also

UsdPrim::ApplyAPI

Parameters:

appliedSchemaName – The full name or alias of the schema to apply.

Returns:

Return true if the schema has been applied, false otherwise.

bool RemoveAppliedSchema(const TfToken &appliedSchemaName) const#

Remove schema of type appliedSchemaName. This removes the attribute of type SdfValueTypeNames->AppliedSchemaTypeTag with value appliedSchemaName. This method assumes:

  • input validation has already been done by other API methods (UsdPrim::RemoveAPI).

  • the appliedSchemaName is the schema alias. For example: MotionAPI instead of UsdGeomMotionAPI. This is required for Fabric.

  • for multiple-apply schemas, appliedSchemaName contains both the namespace and instance name. For example: ‘CollectionAPI:myStuff’.

RemoveAPI is the preferred method for applying valid API schemas. Using RemoveAPI instead will convert schema names to alias and join namespace/instance names.

See also

UsdPrim::RemoveAPI

Parameters:

appliedSchemaName – The full name or alias of the schema to remove.

Returns:

Return true if the schema has been removed, false otherwise.

bool HasAPI(
const TfToken &schemaIdentifier,
const TfToken &instanceName = TfToken(),
) const#

Check is this prim has a schema schemaIdentifier applied. Looks for an authored attribute of type SdfValueTypeNames->AppliedSchemaTypeTag and value schemaIdentifier. For MultipleApplyAPI schemas, the query value is schemaIdentifier as the namespace, joined with instanceName.

Parameters:

  • schemaIdentifier – The full name or alias of the schema to check.

  • instanceName – If non-empy, used to determine if a particular instance of a multiple-apply api schema has been applied to the prim if SchemaType is a multiple-apply api schema. Default empty.

Returns:

Return true if the schema is applied to this prim, false otherwise.

template<typename SchemaType>
inline bool HasAPI(
const TfToken &instanceName = TfToken(),
) const#

Check is this prim has a schema of type SchemaType applied. Looks for an authored attribute of type SdfValueTypeNames->AppliedSchemaTypeTag and value SchemaType.

An error will be issued if SchemaType does not a known applied API schema, or if, for a miltiple-apply API schema, instanceName is empty.

Template Parameters:

SchemaType – The schema type to check.

Parameters:

instanceName – If non-empy, used to determine if a particular instance of a multiple-apply api schema has been applied to the prim if SchemaType is a multiple-apply api schema. Default empty.

Returns:

Return true if the schema is applied to this prim, false otherwise.

bool ApplyAPI(
const TfToken &schemaIdentifier,
const TfToken &instanceName = TfToken(),
) const#

Apply schema of type schemaIdentifier to the prim.

For schemaIdentifier to be valid schema to apply, it must be a single-apply or multiple-apply api schema, and for multiple-apply, instanceName must not be empty.

See also

UsdPrim::AddAppliedSchema

Parameters:

  • schemaIdentifier – The full name or alias of the schema to apply.

  • instanceName – If non-empy, used to determine if a particular instance of a multiple-apply api schema has been applied to the prim if SchemaType is a multiple-apply api schema. Default empty.

Returns:

Return true if the schema has been applied, false otherwise.

template<typename SchemaType>
inline bool ApplyAPI() const#

Apply schema of type SchemaType to the prim.

An error is raised for invalid SchemaType. For SchemaType to be valid schema to apply using this template, it must be a single-apply API schema.

See also

UsdPrim::AddAppliedSchema

Template Parameters:

SchemaType – The schema type to apply.

Returns:

Return true if the schema has been applied, false otherwise.

template<typename SchemaType>
inline bool ApplyAPI(
const TfToken &instanceName,
) const#

Apply schema of type SchemaType to the prim.

An error is raised for invalid SchemaType. For SchemaType to be valid schema to apply using this template, it must be a multiple-apply api schema and instanceName must not be empty.

See also

UsdPrim::AddAppliedSchema

Template Parameters:

SchemaType – The schema type to apply.

Parameters:

instanceName – If non-empy, used to determine if a particular instance of a multiple-apply api schema has been applied to the prim if SchemaType is a multiple-apply api schema.

Returns:

Return true if the schema has been applied, false otherwise.

bool RemoveAPI(
const TfToken &schemaIdentifier,
const TfToken &instanceName = TfToken(),
) const#

Remove schema of type schemaIdentifier.

Parameters:

  • schemaIdentifier – The full name or alias of the schema to remove.

  • instanceName – If non-empy, used to remove a particular instance of a multiple-apply api schema from the prim if SchemaType is a multiple-apply api schema. Default empty.

Returns:

Return true if the schema has been removed, false otherwise.

template<typename SchemaType>
inline bool RemoveAPI() const#

Remove single-apply API schema of type SchemaType.

An error is raised for invalid SchemaType. For SchemaType to be valid schema to remove using this template, it must be a single apply-api schema.

See also

UsdPrim::RemoveAppliedSchema

Template Parameters:

SchemaType – The schema type to remove.

Returns:

Return true if the schema has been removed, false otherwise.

template<typename SchemaType>
inline bool RemoveAPI(
const TfToken &instanceName,
) const#

Remove multiple-apply API schema of type SchemaType.

An error is raised for invalid SchemaType. For SchemaType to be valid schema to remove using this template, it must be a multiple-apply api schema and instanceName must not be empty.

See also

UsdPrim::RemoveAppliedSchema

Template Parameters:

SchemaType – The schema type to remove.

Parameters:

instanceName – Used to remove a particular instance of a multiple-apply api schema from the prim. Must not be empty.

Returns:

Return true if the schema has been removed, false otherwise.

TfTokenVector GetAppliedSchemas() const#

Get all applied schemas. Look for all attributes of type SdfValueTypeNames->AppliedSchemaTypeTag.

Returns:

Return a vector of applied schema alias names.

explicit operator bool() const#

Check if this prim is valid. See UsdPrim::IsValid.

Returns:

Return true if this prim is valid, and false otherwise.

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