Sdr module

Summary: The Sdr (Shader Definition Registry) is a specialized version of Ndr for Shaders.

---

Python bindings for libSdr

Classes:

NodeContext
NodeMetadata
NodeRole
PropertyMetadata
PropertyRole
PropertyTypes
Registry	The shading-specialized version of NdrRegistry .
ShaderNode	A specialized version of NdrNode which holds shading information.
ShaderNodeList
ShaderProperty	A specialized version of NdrProperty which holds shading information.

class pxr.Sdr.NodeContext

Attributes:

Displacement
Light
LightFilter
Pattern
PixelFilter
SampleFilter
Surface
Volume

Displacement = 'displacement'

Light = 'light'

LightFilter = 'lightFilter'

Pattern = 'pattern'

PixelFilter = 'pixelFilter'

SampleFilter = 'sampleFilter'

Surface = 'surface'

Volume = 'volume'

class pxr.Sdr.NodeMetadata

Attributes:

Category
Departments
Help
ImplementationName
Label
Pages
Primvars
Role
SdrDefinitionNameFallbackPrefix
SdrUsdEncodingVersion
Target

Category = 'category'

Departments = 'departments'

Help = 'help'

ImplementationName = '__SDR__implementationName'

Label = 'label'

Pages = 'pages'

Primvars = 'primvars'

Role = 'role'

SdrDefinitionNameFallbackPrefix = 'sdrDefinitionNameFallbackPrefix'

SdrUsdEncodingVersion = 'sdrUsdEncodingVersion'

Target = '__SDR__target'

class pxr.Sdr.NodeRole

Attributes:

Field
Math
Primvar
Texture

Field = 'field'

Math = 'math'

Primvar = 'primvar'

Texture = 'texture'

class pxr.Sdr.PropertyMetadata

Attributes:

Colorspace
Connectable
DefaultInput
Help
Hints
ImplementationName
IsAssetIdentifier
IsDynamicArray
Label
Options
Page
RenderType
Role
SdrUsdDefinitionType
Target
ValidConnectionTypes
VstructConditionalExpr
VstructMemberName
VstructMemberOf
Widget

Colorspace = '__SDR__colorspace'

Connectable = 'connectable'

DefaultInput = '__SDR__defaultinput'

Help = 'help'

Hints = 'hints'

ImplementationName = '__SDR__implementationName'

IsAssetIdentifier = '__SDR__isAssetIdentifier'

IsDynamicArray = 'isDynamicArray'

Label = 'label'

Options = 'options'

Page = 'page'

RenderType = 'renderType'

Role = 'role'

SdrUsdDefinitionType = 'sdrUsdDefinitionType'

Target = '__SDR__target'

ValidConnectionTypes = 'validConnectionTypes'

VstructConditionalExpr = 'vstructConditionalExpr'

VstructMemberName = 'vstructMemberName'

VstructMemberOf = 'vstructMemberOf'

Widget = 'widget'

class pxr.Sdr.PropertyRole

Attributes:

None

None = 'none'

class pxr.Sdr.PropertyTypes

Attributes:

Color
Color4
Float
Int
Matrix
Normal
Point
String
Struct
Terminal
Unknown
Vector
Vstruct

Color = 'color'

Color4 = 'color4'

Float = 'float'

Int = 'int'

Matrix = 'matrix'

Normal = 'normal'

Point = 'point'

String = 'string'

Struct = 'struct'

Terminal = 'terminal'

Unknown = 'unknown'

Vector = 'vector'

Vstruct = 'vstruct'

class pxr.Sdr.Registry

The shading-specialized version of NdrRegistry .

Methods:

GetShaderNodeByIdentifier(identifier, ...)	Exactly like NdrRegistry::GetNodeByIdentifier() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.
GetShaderNodeByIdentifierAndType(identifier, ...)	Exactly like NdrRegistry::GetNodeByIdentifierAndType() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.
GetShaderNodeByName(name, typePriority, filter)	Exactly like NdrRegistry::GetNodeByName() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.
GetShaderNodeByNameAndType(name, nodeType, ...)	Exactly like NdrRegistry::GetNodeByNameAndType() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.
GetShaderNodeFromAsset(shaderAsset, ...)	Wrapper method for NdrRegistry::GetNodeFromAsset() .
GetShaderNodeFromSourceCode(sourceCode, ...)	Wrapper method for NdrRegistry::GetNodeFromSourceCode() .
GetShaderNodesByFamily(family, filter)	Exactly like NdrRegistry::GetNodesByFamily() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.
GetShaderNodesByIdentifier(identifier)	Exactly like NdrRegistry::GetNodesByIdentifier() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.
GetShaderNodesByName(name, filter)	Exactly like NdrRegistry::GetNodesByName() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.

Attributes:

expired

True if this object has expired, False otherwise.

GetShaderNodeByIdentifier(

identifier,

typePriority,

) → ShaderNode

Exactly like NdrRegistry::GetNodeByIdentifier() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.

Parameters:

• identifier (NdrIdentifier)

• typePriority (NdrTokenVec)

GetShaderNodeByIdentifierAndType(

identifier,

nodeType,

) → ShaderNode

Exactly like NdrRegistry::GetNodeByIdentifierAndType() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.

Parameters:

• identifier (NdrIdentifier)

• nodeType (str)

GetShaderNodeByName(name, typePriority, filter) → ShaderNode

Exactly like NdrRegistry::GetNodeByName() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.

Parameters:

• name (str)

• typePriority (NdrTokenVec)

• filter (VersionFilter)

GetShaderNodeByNameAndType(

name,

nodeType,

filter,

) → ShaderNode

Exactly like NdrRegistry::GetNodeByNameAndType() , but returns a SdrShaderNode pointer instead of a NdrNode pointer.

Parameters:

• name (str)

• nodeType (str)

• filter (VersionFilter)

GetShaderNodeFromAsset(

shaderAsset,

metadata,

subIdentifier,

sourceType,

) → ShaderNode

Wrapper method for NdrRegistry::GetNodeFromAsset() .

Returns a valid SdrShaderNode pointer upon success.

Parameters:

• shaderAsset (AssetPath)

• metadata (NdrTokenMap)

• subIdentifier (str)

• sourceType (str)

GetShaderNodeFromSourceCode(

sourceCode,

sourceType,

metadata,

) → ShaderNode

Wrapper method for NdrRegistry::GetNodeFromSourceCode() .

Returns a valid SdrShaderNode pointer upon success.

Parameters:

• sourceCode (str)

• sourceType (str)

• metadata (NdrTokenMap)

GetShaderNodesByFamily(family, filter) → SdrShaderNodePtrVec

Exactly like NdrRegistry::GetNodesByFamily() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.

Parameters:

• family (str)

• filter (VersionFilter)

GetShaderNodesByIdentifier(identifier) → SdrShaderNodePtrVec

Exactly like NdrRegistry::GetNodesByIdentifier() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.

Parameters:

identifier (NdrIdentifier)

GetShaderNodesByName(name, filter) → SdrShaderNodePtrVec

Exactly like NdrRegistry::GetNodesByName() , but returns a vector of SdrShaderNode pointers instead of a vector of NdrNode pointers.

Parameters:

• name (str)

• filter (VersionFilter)

property expired

True if this object has expired, False otherwise.

class pxr.Sdr.ShaderNode

A specialized version of NdrNode which holds shading information.

Methods:

GetAdditionalPrimvarProperties()	The list of string input properties whose values provide the names of additional primvars consumed by this node.
GetAllVstructNames()	Gets all vstructs that are present in the shader.
GetAssetIdentifierInputNames()	Returns the list of all inputs that are tagged as asset identifier inputs.
GetCategory()	The category assigned to this node, if any.
GetDefaultInput()	Returns the first shader input that is tagged as the default input.
GetDepartments()	The departments this node is associated with, if any.
GetHelp()	The help message assigned to this node, if any.
GetImplementationName()	Returns the implementation name of this node.
GetLabel()	The label assigned to this node, if any.
GetPages()	Gets the pages on which the node's properties reside (an aggregate of the unique SdrShaderProperty::GetPage() values for all of the node's properties).
GetPrimvars()	The list of primvars this node knows it requires / uses.
GetPropertyNamesForPage(pageName)	Gets the names of the properties on a certain page (one that was returned by GetPages() ).
GetRole()	Returns the role of this node.
GetShaderInput(inputName)	Get a shader input property by name.
GetShaderOutput(outputName)	Get a shader output property by name.

GetAdditionalPrimvarProperties() → NdrTokenVec

The list of string input properties whose values provide the names of additional primvars consumed by this node.

For example, this may return a token named varname . This indicates that the client should query the value of a (presumed to be string-valued) input attribute named varname from its scene description to determine the name of a primvar the node will consume. See GetPrimvars() for additional information.

GetAllVstructNames() → NdrTokenVec

Gets all vstructs that are present in the shader.

GetAssetIdentifierInputNames() → NdrTokenVec

Returns the list of all inputs that are tagged as asset identifier inputs.

GetCategory() → str

The category assigned to this node, if any.

Distinct from the family returned from GetFamily() .

GetDefaultInput() → ShaderProperty

Returns the first shader input that is tagged as the default input.

A default input and its value can be used to acquire a fallback value for a node when the node is considered’disabled’or otherwise incapable of producing an output value.

GetDepartments() → NdrTokenVec

The departments this node is associated with, if any.

GetHelp() → str

The help message assigned to this node, if any.

GetImplementationName() → str

Returns the implementation name of this node.

The name of the node is how to refer to the node in shader networks. The label is how to present this node to users. The implementation name is the name of the function (or something) this node represents in the implementation. Any client using the implementation must call this method to get the correct name; using getName() is not correct.

GetLabel() → str

The label assigned to this node, if any.

Distinct from the name returned from GetName() . In the context of a UI, the label value might be used as the display name for the node instead of the name.

GetPages() → NdrTokenVec

Gets the pages on which the node’s properties reside (an aggregate of the unique SdrShaderProperty::GetPage() values for all of the node’s properties).

Nodes themselves do not reside on pages. In an example scenario, properties might be divided into two pages,’Simple’and’Advanced’.

GetPrimvars() → NdrTokenVec

The list of primvars this node knows it requires / uses.

For example, a shader node may require the’normals’primvar to function correctly. Additional, user specified primvars may have been authored on the node. These can be queried via GetAdditionalPrimvarProperties() . Together, GetPrimvars() and GetAdditionalPrimvarProperties() , provide the complete list of primvar requirements for the node.

GetPropertyNamesForPage(pageName) → NdrTokenVec

Gets the names of the properties on a certain page (one that was returned by GetPages() ).

To get properties that are not assigned to a page, an empty string can be used for pageName .

Parameters:

pageName (str)

GetRole() → str

Returns the role of this node.

This is used to annotate the role that the shader node plays inside a shader network. We can tag certain shaders to indicate their role within a shading network. We currently tag primvar reading nodes, texture reading nodes and nodes that access volume fields (like extinction or scattering). This is done to identify resources used by a shading network.

GetShaderInput(inputName) → ShaderProperty

Get a shader input property by name.

nullptr is returned if an input with the given name does not exist.

Parameters:

inputName (str)

GetShaderOutput(outputName) → ShaderProperty

Get a shader output property by name.

nullptr is returned if an output with the given name does not exist.

Parameters:

outputName (str)

class pxr.Sdr.ShaderNodeList

Methods:

append
extend

append()

extend()

class pxr.Sdr.ShaderProperty

A specialized version of NdrProperty which holds shading information.

Methods:

GetDefaultValueAsSdfType()	Accessor for default value corresponding to the SdfValueTypeName returned by GetTypeAsSdfType.
GetHelp()	The help message assigned to this property, if any.
GetHints()	Any UI"hints"that are associated with this property.
GetImplementationName()	Returns the implementation name of this property.
GetLabel()	The label assigned to this property, if any.
GetOptions()	If the property has a set of valid values that are pre-determined, this will return the valid option names and corresponding string values (if the option was specified with a value).
GetPage()	The page (group), eg"Advanced", this property appears on, if any.
GetVStructConditionalExpr()	If this field is part of a vstruct, this is the conditional expression.
GetVStructMemberName()	If this field is part of a vstruct, this is its name in the struct.
GetVStructMemberOf()	If this field is part of a vstruct, this is the name of the struct.
GetValidConnectionTypes()	Gets the list of valid connection types for this property.
GetWidget()	The widget"hint"that indicates the widget that can best display the type of data contained in this property, if any.
IsAssetIdentifier()	Determines if the value held by this property is an asset identifier (eg, a file path); the logic for this is left up to the parser.
IsDefaultInput()	Determines if the value held by this property is the default input for this node.
IsVStruct()	Returns true if the field is the head of a vstruct.
IsVStructMember()	Returns true if this field is part of a vstruct.

GetDefaultValueAsSdfType() → VtValue

Accessor for default value corresponding to the SdfValueTypeName returned by GetTypeAsSdfType.

Note that this is different than GetDefaultValue which returns the default value associated with the SdrPropertyType and may differ from the SdfValueTypeName, example when sdrUsdDefinitionType metadata is specified for a sdr property.

GetTypeAsSdfType

GetHelp() → str

The help message assigned to this property, if any.

GetHints() → NdrTokenMap

Any UI”hints”that are associated with this property.

“Hints”are simple key/value pairs.

GetImplementationName() → str

Returns the implementation name of this property.

The name of the property is how to refer to the property in shader networks. The label is how to present this property to users. The implementation name is the name of the parameter this property represents in the implementation. Any client using the implementation must call this method to get the correct name; using getName() is not correct.

GetLabel() → str

The label assigned to this property, if any.

Distinct from the name returned from GetName() . In the context of a UI, the label value might be used as the display name for the property instead of the name.

GetOptions() → NdrOptionVec

If the property has a set of valid values that are pre-determined, this will return the valid option names and corresponding string values (if the option was specified with a value).

GetPage() → str

The page (group), eg”Advanced”, this property appears on, if any.

Note that the page for a shader property can be nested, delimited by”:”, representing the hierarchy of sub-pages a property is defined in.

GetVStructConditionalExpr() → str

If this field is part of a vstruct, this is the conditional expression.

GetVStructMemberName() → str

If this field is part of a vstruct, this is its name in the struct.

GetVStructMemberOf() → str

If this field is part of a vstruct, this is the name of the struct.

GetValidConnectionTypes() → NdrTokenVec

Gets the list of valid connection types for this property.

This value comes from shader metadata, and may not be specified. The value from NdrProperty::GetType() can be used as a fallback, or you can use the connectability test in CanConnectTo() .

GetWidget() → str

The widget”hint”that indicates the widget that can best display the type of data contained in this property, if any.

Examples of this value could include”number”,”slider”, etc.

IsAssetIdentifier() → bool

Determines if the value held by this property is an asset identifier (eg, a file path); the logic for this is left up to the parser.

Note: The type returned from GetTypeAsSdfType() will be Asset if this method returns true (even though its true underlying data type is string).

IsDefaultInput() → bool

Determines if the value held by this property is the default input for this node.

IsVStruct() → bool

Returns true if the field is the head of a vstruct.

IsVStructMember() → bool

Returns true if this field is part of a vstruct.