UsdRender module

Summary: The UsdRender module provides schemas and behaviors for describing renders.

Classes:

`DenoisePass`	A RenderDenoisePass generates renders via a denoising process.
`Pass`	A RenderPass prim encapsulates the necessary information to generate multipass renders.
`Product`	A UsdRenderProduct describes an image or other file-like artifact produced by a render.
`Settings`	A UsdRenderSettings prim specifies global settings for a render process, including an enumeration of the RenderProducts that should result, and the UsdGeomImageable purposes that should be rendered.
`SettingsBase`	Abstract base class that defines render settings that can be specified on either a RenderSettings prim or a RenderProduct prim.
`Tokens`
`Var`	A UsdRenderVar describes a custom data variable for a render to produce.

class pxr.UsdRender.DenoisePass

A RenderDenoisePass generates renders via a denoising process. This may be the same renderer that a pipeline uses for UsdRender, or may be a separate one. Notably, a RenderDenoisePass requires another Pass to be present for it to operate. The denoising process itself is not generative, and requires images inputs to operate.

As denoising integration varies so widely across pipelines, all implementation details are left to pipeline-specific prims that inherit from RenderDenoisePass.

Methods:

`Define`	classmethod Define(stage, path) -> DenoisePass
`Get`	classmethod Get(stage, path) -> DenoisePass
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

static Define()

classmethod Define(stage, path) -> DenoisePass

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

If a prim adhering to this schema at path is already defined on this stage, return that prim. Otherwise author an SdfPrimSpec with specifier == SdfSpecifierDef and this schema’s prim type name for the prim at path at the current EditTarget. Author SdfPrimSpec s with specifier == SdfSpecifierDef and empty typeName at the current EditTarget for any nonexistent, or existing but not Defined ancestors.

The given path must be an absolute prim path that does not contain any variant selections.

If it is impossible to author any of the necessary PrimSpecs, (for example, in case path cannot map to the current UsdEditTarget ‘s namespace) issue an error and return an invalid UsdPrim.

Note that this method may return a defined prim whose typeName does not specify this schema class, in case a stronger typeName opinion overrides the opinion at the current EditTarget.

Parameters

stage (Stage) –
path (Path) –

static Get()

classmethod Get(stage, path) -> DenoisePass

Return a UsdRenderDenoisePass 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:

UsdRenderDenoisePass(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

class pxr.UsdRender.Pass

A RenderPass prim encapsulates the necessary information to generate multipass renders. It houses properties for generating dependencies and the necessary commands to run to generate renders, as well as visibility controls for the scene. While RenderSettings describes the information needed to generate images from a single invocation of a renderer, RenderPass describes the additional information needed to generate a time varying set of images.

There are two consumers of RenderPass prims - a runtime executable that generates images from usdRender prims, and pipeline specific code that translates between usdRender prims and the pipeline’s resource scheduling software. We’ll refer to the latter as’job submission code’.

The name of the prim is used as the pass’s name.

For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdRenderTokens. So to set an attribute to the value”rightHanded”, use UsdRenderTokens->rightHanded as the value.

Methods:

`CreateCommandAttr`(defaultValue, writeSparsely)	See GetCommandAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateDenoiseEnableAttr`(defaultValue, ...)	See GetDenoiseEnableAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateDenoisePassRel`()	See GetDenoisePassRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateFileNameAttr`(defaultValue, writeSparsely)	See GetFileNameAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateInputPassesRel`()	See GetInputPassesRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreatePassTypeAttr`(defaultValue, writeSparsely)	See GetPassTypeAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateRenderSourceRel`()	See GetRenderSourceRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`Define`	classmethod Define(stage, path) -> Pass
`Get`	classmethod Get(stage, path) -> Pass
`GetCommandAttr`()	The command to run in order to generate renders for this pass.
`GetDenoiseEnableAttr`()	When True, this Pass pass should be denoised.
`GetDenoisePassRel`()	The The UsdRenderDenoisePass prim from which to source denoise settings.
`GetFileNameAttr`()	The asset that contains the rendering prims or other information needed to render this pass.
`GetInputPassesRel`()	The set of other Passes that this Pass depends on in order to be constructed properly.
`GetPassTypeAttr`()	A string used to categorize differently structured or executed types of passes within a customized pipeline.
`GetRenderSourceRel`()	The source prim to render from.
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

CreateCommandAttr(defaultValue, writeSparsely) → Attribute

See GetCommandAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateDenoiseEnableAttr(defaultValue, writeSparsely) → Attribute

See GetDenoiseEnableAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateDenoisePassRel() → Relationship: See GetDenoisePassRel() , and also Create vs Get Property Methods for when to use Get vs Create.

CreateFileNameAttr(defaultValue, writeSparsely) → Attribute

See GetFileNameAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateInputPassesRel() → Relationship: See GetInputPassesRel() , and also Create vs Get Property Methods for when to use Get vs Create.

CreatePassTypeAttr(defaultValue, writeSparsely) → Attribute

See GetPassTypeAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateRenderSourceRel() → Relationship: See GetRenderSourceRel() , and also Create vs Get Property Methods for when to use Get vs Create.

static Define()

classmethod Define(stage, path) -> Pass

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

If a prim adhering to this schema at path is already defined on this stage, return that prim. Otherwise author an SdfPrimSpec with specifier == SdfSpecifierDef and this schema’s prim type name for the prim at path at the current EditTarget. Author SdfPrimSpec s with specifier == SdfSpecifierDef and empty typeName at the current EditTarget for any nonexistent, or existing but not Defined ancestors.

The given path must be an absolute prim path that does not contain any variant selections.

If it is impossible to author any of the necessary PrimSpecs, (for example, in case path cannot map to the current UsdEditTarget ‘s namespace) issue an error and return an invalid UsdPrim.

Note that this method may return a defined prim whose typeName does not specify this schema class, in case a stronger typeName opinion overrides the opinion at the current EditTarget.

Parameters

stage (Stage) –
path (Path) –

static Get()

classmethod Get(stage, path) -> Pass

Return a UsdRenderPass 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:

UsdRenderPass(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

GetCommandAttr() → Attribute

The command to run in order to generate renders for this pass.

The job submission code can use this to properly send tasks to the job scheduling software that will generate products.

The command can contain variables that will be substituted appropriately during submission, as seen in the example below with {fileName}.

For example: command[0] =”prman”command[1] =”-progress”command[2] =”-pixelvariance”command[3] =”-0.15”command[4] =”{fileName}”# the fileName property will be substituted

Declaration

uniform string[] command

C++ Type

VtArray<std::string>

Usd Type

SdfValueTypeNames->StringArray

Variability

SdfVariabilityUniform

GetDenoiseEnableAttr() → Attribute

When True, this Pass pass should be denoised.

Declaration

uniform bool denoise:enable = 0

C++ Type

bool

Usd Type

SdfValueTypeNames->Bool

Variability

SdfVariabilityUniform

GetDenoisePassRel() → Relationship: The The UsdRenderDenoisePass prim from which to source denoise settings.

GetFileNameAttr() → Attribute

The asset that contains the rendering prims or other information needed to render this pass.

Declaration

uniform asset fileName

C++ Type

SdfAssetPath

Usd Type

SdfValueTypeNames->Asset

Variability

SdfVariabilityUniform

GetInputPassesRel() → Relationship

The set of other Passes that this Pass depends on in order to be constructed properly.

For example, a Pass A may generate a texture, which is then used as an input to Pass B.

By default, usdRender makes some assumptions about the relationship between this prim and the prims listed in inputPasses. Namely, when per-frame tasks are generated from these pass prims, usdRender will assume a one-to-one relationship between tasks that share their frame number. Consider a pass named’composite’whose inputPasses targets a Pass prim named’beauty`. By default, each frame for’composite’will depend on the same frame from’beauty’: beauty.1 ->composite.1 beauty.2 ->composite.2 etc

The consumer of this RenderPass graph of inputs will need to resolve the transitive dependencies.

GetPassTypeAttr() → Attribute

A string used to categorize differently structured or executed types of passes within a customized pipeline.

For example, when multiple DCC’s (e.g. Houdini, Katana, Nuke) each compute and contribute different Products to a final result, it may be clearest and most flexible to create a separate RenderPass for each.

Declaration

uniform token passType

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

GetRenderSourceRel() → Relationship

The source prim to render from.

If fileName is not present, the source is assumed to be a RenderSettings prim present in the current Usd stage. If fileName is present, the source should be found in the file there. This relationship might target a string attribute on this or another prim that identifies the appropriate object in the external container.

For example, for a Usd-backed pass, this would point to a RenderSettings prim. Houdini passes would point to a Rop. Nuke passes would point to a write node.

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

class pxr.UsdRender.Product

A UsdRenderProduct describes an image or other file-like artifact produced by a render. A RenderProduct combines one or more RenderVars into a file or interactive buffer. It also provides all the controls established in UsdRenderSettingsBase as optional overrides to whatever the owning UsdRenderSettings prim dictates.

Specific renderers may support additional settings, such as a way to configure compression settings, filetype metadata, and so forth. Such settings can be encoded using renderer-specific API schemas applied to the product prim.

For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdRenderTokens. So to set an attribute to the value”rightHanded”, use UsdRenderTokens->rightHanded as the value.

Methods:

`CreateOrderedVarsRel`()	See GetOrderedVarsRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateProductNameAttr`(defaultValue, ...)	See GetProductNameAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateProductTypeAttr`(defaultValue, ...)	See GetProductTypeAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`Define`	classmethod Define(stage, path) -> Product
`Get`	classmethod Get(stage, path) -> Product
`GetOrderedVarsRel`()	Specifies the RenderVars that should be consumed and combined into the final product.
`GetProductNameAttr`()	Specifies the name that the output/display driver should give the product.
`GetProductTypeAttr`()	The type of output to produce.
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

CreateOrderedVarsRel() → Relationship: See GetOrderedVarsRel() , and also Create vs Get Property Methods for when to use Get vs Create.

CreateProductNameAttr(defaultValue, writeSparsely) → Attribute

See GetProductNameAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateProductTypeAttr(defaultValue, writeSparsely) → Attribute

See GetProductTypeAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

static Define()

classmethod Define(stage, path) -> Product

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

If a prim adhering to this schema at path is already defined on this stage, return that prim. Otherwise author an SdfPrimSpec with specifier == SdfSpecifierDef and this schema’s prim type name for the prim at path at the current EditTarget. Author SdfPrimSpec s with specifier == SdfSpecifierDef and empty typeName at the current EditTarget for any nonexistent, or existing but not Defined ancestors.

The given path must be an absolute prim path that does not contain any variant selections.

If it is impossible to author any of the necessary PrimSpecs, (for example, in case path cannot map to the current UsdEditTarget ‘s namespace) issue an error and return an invalid UsdPrim.

Note that this method may return a defined prim whose typeName does not specify this schema class, in case a stronger typeName opinion overrides the opinion at the current EditTarget.

Parameters

stage (Stage) –
path (Path) –

static Get()

classmethod Get(stage, path) -> Product

Return a UsdRenderProduct 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:

UsdRenderProduct(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

GetOrderedVarsRel() → Relationship

Specifies the RenderVars that should be consumed and combined into the final product.

If ordering is relevant to the output driver, then the ordering of targets in this relationship provides the order to use.

GetProductNameAttr() → Attribute

Specifies the name that the output/display driver should give the product.

This is provided as-authored to the driver, whose responsibility it is to situate the product on a filesystem or other storage, in the desired location.

Declaration

token productName =""

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

GetProductTypeAttr() → Attribute

The type of output to produce.

The default,”raster”, indicates a 2D image.

In the future, UsdRender may define additional product types.

Declaration

uniform token productType ="raster"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

class pxr.UsdRender.Settings

A UsdRenderSettings prim specifies global settings for a render process, including an enumeration of the RenderProducts that should result, and the UsdGeomImageable purposes that should be rendered. How settings affect rendering

For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdRenderTokens. So to set an attribute to the value”rightHanded”, use UsdRenderTokens->rightHanded as the value.

Methods:

`CreateIncludedPurposesAttr`(defaultValue, ...)	See GetIncludedPurposesAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateMaterialBindingPurposesAttr`(...)	See GetMaterialBindingPurposesAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateProductsRel`()	See GetProductsRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateRenderingColorSpaceAttr`(defaultValue, ...)	See GetRenderingColorSpaceAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`Define`	classmethod Define(stage, path) -> Settings
`Get`	classmethod Get(stage, path) -> Settings
`GetIncludedPurposesAttr`()	The list of UsdGeomImageable purpose values that should be included in the render.
`GetMaterialBindingPurposesAttr`()	Ordered list of material purposes to consider when resolving material bindings in the scene.
`GetProductsRel`()	The set of RenderProducts the render should produce.
`GetRenderingColorSpaceAttr`()	Describes a renderer's working (linear) colorSpace where all the renderer/shader math is expected to happen.
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]
`GetStageRenderSettings`	classmethod GetStageRenderSettings(stage) -> Settings

CreateIncludedPurposesAttr(defaultValue, writeSparsely) → Attribute

See GetIncludedPurposesAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateMaterialBindingPurposesAttr(defaultValue, writeSparsely) → Attribute

See GetMaterialBindingPurposesAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateProductsRel() → Relationship: See GetProductsRel() , and also Create vs Get Property Methods for when to use Get vs Create.

CreateRenderingColorSpaceAttr(defaultValue, writeSparsely) → Attribute

See GetRenderingColorSpaceAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

static Define()

classmethod Define(stage, path) -> Settings

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

If a prim adhering to this schema at path is already defined on this stage, return that prim. Otherwise author an SdfPrimSpec with specifier == SdfSpecifierDef and this schema’s prim type name for the prim at path at the current EditTarget. Author SdfPrimSpec s with specifier == SdfSpecifierDef and empty typeName at the current EditTarget for any nonexistent, or existing but not Defined ancestors.

The given path must be an absolute prim path that does not contain any variant selections.

If it is impossible to author any of the necessary PrimSpecs, (for example, in case path cannot map to the current UsdEditTarget ‘s namespace) issue an error and return an invalid UsdPrim.

Note that this method may return a defined prim whose typeName does not specify this schema class, in case a stronger typeName opinion overrides the opinion at the current EditTarget.

Parameters

stage (Stage) –
path (Path) –

static Get()

classmethod Get(stage, path) -> Settings

Return a UsdRenderSettings 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:

UsdRenderSettings(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

GetIncludedPurposesAttr() → Attribute

The list of UsdGeomImageable purpose values that should be included in the render.

Note this cannot be specified per-RenderProduct because it is a statement of which geometry is present.

Declaration

uniform token[] includedPurposes = ["default","render"]

C++ Type

VtArray<TfToken>

Usd Type

SdfValueTypeNames->TokenArray

Variability

SdfVariabilityUniform

GetMaterialBindingPurposesAttr() → Attribute

Ordered list of material purposes to consider when resolving material bindings in the scene.

The empty string indicates the”allPurpose”binding.

Declaration

uniform token[] materialBindingPurposes = ["full",""]

C++ Type

VtArray<TfToken>

Usd Type

SdfValueTypeNames->TokenArray

Variability

SdfVariabilityUniform

Allowed Values

full, preview,””

GetProductsRel() → Relationship

The set of RenderProducts the render should produce.

This relationship should target UsdRenderProduct prims. If no products are specified, an application should produce an rgb image according to the RenderSettings configuration, to a default display or image name.

GetRenderingColorSpaceAttr() → Attribute

Describes a renderer’s working (linear) colorSpace where all the renderer/shader math is expected to happen.

When no renderingColorSpace is provided, renderer should use its own default.

Declaration

uniform token renderingColorSpace

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

static GetStageRenderSettings()

classmethod GetStageRenderSettings(stage) -> Settings

Fetch and return stage ‘s render settings, as indicated by root layer metadata.

If unauthored, or the metadata does not refer to a valid UsdRenderSettings prim, this will return an invalid UsdRenderSettings prim.

Parameters: stage (UsdStageWeak) –

class pxr.UsdRender.SettingsBase

Abstract base class that defines render settings that can be specified on either a RenderSettings prim or a RenderProduct prim.

For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdRenderTokens. So to set an attribute to the value”rightHanded”, use UsdRenderTokens->rightHanded as the value.

Methods:

`CreateAspectRatioConformPolicyAttr`(...)	See GetAspectRatioConformPolicyAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateCameraRel`()	See GetCameraRel() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateDataWindowNDCAttr`(defaultValue, ...)	See GetDataWindowNDCAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateDisableMotionBlurAttr`(defaultValue, ...)	See GetDisableMotionBlurAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateInstantaneousShutterAttr`(defaultValue, ...)	See GetInstantaneousShutterAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreatePixelAspectRatioAttr`(defaultValue, ...)	See GetPixelAspectRatioAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateResolutionAttr`(defaultValue, writeSparsely)	See GetResolutionAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`Get`	classmethod Get(stage, path) -> SettingsBase
`GetAspectRatioConformPolicyAttr`()	Indicates the policy to use to resolve an aspect ratio mismatch between the camera aperture and image settings.
`GetCameraRel`()	The camera relationship specifies the primary camera to use in a render.
`GetDataWindowNDCAttr`()	dataWindowNDC specifies the axis-aligned rectangular region in the adjusted aperture window within which the renderer should produce data.
`GetDisableMotionBlurAttr`()	Disable all motion blur by setting the shutter interval of the targeted camera to [0,0] - that is, take only one sample, namely at the current time code.
`GetInstantaneousShutterAttr`()	Deprecated - use disableMotionBlur instead.
`GetPixelAspectRatioAttr`()	The aspect ratio (width/height) of image pixels.
`GetResolutionAttr`()	The image pixel resolution, corresponding to the camera's screen window.
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

CreateAspectRatioConformPolicyAttr(defaultValue, writeSparsely) → Attribute

See GetAspectRatioConformPolicyAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateCameraRel() → Relationship: See GetCameraRel() , and also Create vs Get Property Methods for when to use Get vs Create.

CreateDataWindowNDCAttr(defaultValue, writeSparsely) → Attribute

See GetDataWindowNDCAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateDisableMotionBlurAttr(defaultValue, writeSparsely) → Attribute

See GetDisableMotionBlurAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateInstantaneousShutterAttr(defaultValue, writeSparsely) → Attribute

See GetInstantaneousShutterAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreatePixelAspectRatioAttr(defaultValue, writeSparsely) → Attribute

See GetPixelAspectRatioAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateResolutionAttr(defaultValue, writeSparsely) → Attribute

See GetResolutionAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

static Get()

classmethod Get(stage, path) -> SettingsBase

Return a UsdRenderSettingsBase 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:

UsdRenderSettingsBase(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

GetAspectRatioConformPolicyAttr() → Attribute

Indicates the policy to use to resolve an aspect ratio mismatch between the camera aperture and image settings.

This policy allows a standard render setting to do something reasonable given varying camera inputs.

The camera aperture aspect ratio is determined by the aperture atributes on the UsdGeomCamera.

The image aspect ratio is determined by the resolution and pixelAspectRatio attributes in the render settings.

“expandAperture”: if necessary, expand the aperture to fit the image, exposing additional scene content

“cropAperture”: if necessary, crop the aperture to fit the image, cropping scene content

“adjustApertureWidth”: if necessary, adjust aperture width to make its aspect ratio match the image

“adjustApertureHeight”: if necessary, adjust aperture height to make its aspect ratio match the image

“adjustPixelAspectRatio”: compute pixelAspectRatio to make the image exactly cover the aperture; disregards existing attribute value of pixelAspectRatio

Declaration

uniform token aspectRatioConformPolicy ="expandAperture"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

Allowed Values

expandAperture, cropAperture, adjustApertureWidth, adjustApertureHeight, adjustPixelAspectRatio

GetCameraRel() → Relationship

The camera relationship specifies the primary camera to use in a render.

It must target a UsdGeomCamera.

GetDataWindowNDCAttr() → Attribute

dataWindowNDC specifies the axis-aligned rectangular region in the adjusted aperture window within which the renderer should produce data.

It is specified as (xmin, ymin, xmax, ymax) in normalized device coordinates, where the range 0 to 1 corresponds to the aperture. (0,0) corresponds to the bottom-left corner and (1,1) corresponds to the upper-right corner.

Specifying a window outside the unit square will produce overscan data. Specifying a window that does not cover the unit square will produce a cropped render.

A pixel is included in the rendered result if the pixel center is contained by the data window. This is consistent with standard rules used by polygon rasterization engines. UsdRenderRasterization

The data window is expressed in NDC so that cropping and overscan may be resolution independent. In interactive workflows, incremental cropping and resolution adjustment may be intermixed to isolate and examine parts of the scene. In compositing workflows, overscan may be used to support image post-processing kernels, and reduced-resolution proxy renders may be used for faster iteration.

The dataWindow:ndc coordinate system references the aperture after any adjustments required by aspectRatioConformPolicy.

Declaration

uniform float4 dataWindowNDC = (0, 0, 1, 1)

C++ Type

GfVec4f

Usd Type

SdfValueTypeNames->Float4

Variability

SdfVariabilityUniform

GetDisableMotionBlurAttr() → Attribute

Disable all motion blur by setting the shutter interval of the targeted camera to [0,0] - that is, take only one sample, namely at the current time code.

Declaration

uniform bool disableMotionBlur = 0

C++ Type

bool

Usd Type

SdfValueTypeNames->Bool

Variability

SdfVariabilityUniform

GetInstantaneousShutterAttr() → Attribute

Deprecated - use disableMotionBlur instead.

Override the targeted camera ‘s shutterClose to be equal to the value of its shutterOpen, to produce a zero-width shutter interval. This gives us a convenient way to disable motion blur.

Declaration

uniform bool instantaneousShutter = 0

C++ Type

bool

Usd Type

SdfValueTypeNames->Bool

Variability

SdfVariabilityUniform

GetPixelAspectRatioAttr() → Attribute

The aspect ratio (width/height) of image pixels.

The default ratio 1.0 indicates square pixels.

Declaration

uniform float pixelAspectRatio = 1

C++ Type

float

Usd Type

SdfValueTypeNames->Float

Variability

SdfVariabilityUniform

GetResolutionAttr() → Attribute

The image pixel resolution, corresponding to the camera’s screen window.

Declaration

uniform int2 resolution = (2048, 1080)

C++ Type

GfVec2i

Usd Type

SdfValueTypeNames->Int2

Variability

SdfVariabilityUniform

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

class pxr.UsdRender.Tokens

Attributes:

`adjustApertureHeight`
`adjustApertureWidth`
`adjustPixelAspectRatio`
`aspectRatioConformPolicy`
`camera`
`color3f`
`command`
`cropAperture`
`dataType`
`dataWindowNDC`
`denoiseEnable`
`denoisePass`
`disableMotionBlur`
`expandAperture`
`fileName`
`full`
`includedPurposes`
`inputPasses`
`instantaneousShutter`
`intrinsic`
`lpe`
`materialBindingPurposes`
`orderedVars`
`passType`
`pixelAspectRatio`
`preview`
`primvar`
`productName`
`productType`
`products`
`raster`
`raw`
`renderSettingsPrimPath`
`renderSource`
`renderingColorSpace`
`resolution`
`sourceName`
`sourceType`

adjustApertureHeight = 'adjustApertureHeight'

adjustApertureWidth = 'adjustApertureWidth'

adjustPixelAspectRatio = 'adjustPixelAspectRatio'

aspectRatioConformPolicy = 'aspectRatioConformPolicy'

camera = 'camera'

color3f = 'color3f'

command = 'command'

cropAperture = 'cropAperture'

dataType = 'dataType'

dataWindowNDC = 'dataWindowNDC'

denoiseEnable = 'denoise:enable'

denoisePass = 'denoise:pass'

disableMotionBlur = 'disableMotionBlur'

expandAperture = 'expandAperture'

fileName = 'fileName'

full = 'full'

includedPurposes = 'includedPurposes'

inputPasses = 'inputPasses'

instantaneousShutter = 'instantaneousShutter'

intrinsic = 'intrinsic'

lpe = 'lpe'

materialBindingPurposes = 'materialBindingPurposes'

orderedVars = 'orderedVars'

passType = 'passType'

pixelAspectRatio = 'pixelAspectRatio'

preview = 'preview'

primvar = 'primvar'

productName = 'productName'

productType = 'productType'

products = 'products'

raster = 'raster'

raw = 'raw'

renderSettingsPrimPath = 'renderSettingsPrimPath'

renderSource = 'renderSource'

renderingColorSpace = 'renderingColorSpace'

resolution = 'resolution'

sourceName = 'sourceName'

sourceType = 'sourceType'

class pxr.UsdRender.Var

A UsdRenderVar describes a custom data variable for a render to produce. The prim describes the source of the data, which can be a shader output or an LPE (Light Path Expression), and also allows encoding of (generally renderer-specific) parameters that configure the renderer for computing the variable.

The name of the RenderVar prim drives the name of the data variable that the renderer will produce.

In the future, UsdRender may standardize RenderVar representation for well-known variables under the sourceType intrinsic , such as r, g, b, a, z, or id. For any described attribute Fallback Value or Allowed Values below that are text/tokens, the actual token is published and defined in UsdRenderTokens. So to set an attribute to the value”rightHanded”, use UsdRenderTokens->rightHanded as the value.

Methods:

`CreateDataTypeAttr`(defaultValue, writeSparsely)	See GetDataTypeAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateSourceNameAttr`(defaultValue, writeSparsely)	See GetSourceNameAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`CreateSourceTypeAttr`(defaultValue, writeSparsely)	See GetSourceTypeAttr() , and also Create vs Get Property Methods for when to use Get vs Create.
`Define`	classmethod Define(stage, path) -> Var
`Get`	classmethod Get(stage, path) -> Var
`GetDataTypeAttr`()	The type of this channel, as a USD attribute type.
`GetSchemaAttributeNames`	classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]
`GetSourceNameAttr`()	The renderer should look for an output of this name as the computed value for the RenderVar.
`GetSourceTypeAttr`()	Indicates the type of the source.

CreateDataTypeAttr(defaultValue, writeSparsely) → Attribute

See GetDataTypeAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateSourceNameAttr(defaultValue, writeSparsely) → Attribute

See GetSourceNameAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

CreateSourceTypeAttr(defaultValue, writeSparsely) → Attribute

See GetSourceTypeAttr() , 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 .

Parameters

defaultValue (VtValue) –
writeSparsely (bool) –

static Define()

classmethod Define(stage, path) -> Var

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

If a prim adhering to this schema at path is already defined on this stage, return that prim. Otherwise author an SdfPrimSpec with specifier == SdfSpecifierDef and this schema’s prim type name for the prim at path at the current EditTarget. Author SdfPrimSpec s with specifier == SdfSpecifierDef and empty typeName at the current EditTarget for any nonexistent, or existing but not Defined ancestors.

The given path must be an absolute prim path that does not contain any variant selections.

If it is impossible to author any of the necessary PrimSpecs, (for example, in case path cannot map to the current UsdEditTarget ‘s namespace) issue an error and return an invalid UsdPrim.

Note that this method may return a defined prim whose typeName does not specify this schema class, in case a stronger typeName opinion overrides the opinion at the current EditTarget.

Parameters

stage (Stage) –
path (Path) –

static Get()

classmethod Get(stage, path) -> Var

Return a UsdRenderVar 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:

UsdRenderVar(stage->GetPrimAtPath(path));

Parameters

stage (Stage) –
path (Path) –

GetDataTypeAttr() → Attribute

The type of this channel, as a USD attribute type.

Declaration

uniform token dataType ="color3f"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

static GetSchemaAttributeNames()

classmethod GetSchemaAttributeNames(includeInherited) -> list[TfToken]

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.

Parameters: includeInherited (bool) –

GetSourceNameAttr() → Attribute

The renderer should look for an output of this name as the computed value for the RenderVar.

Declaration

uniform string sourceName =""

C++ Type

std::string

Usd Type

SdfValueTypeNames->String

Variability

SdfVariabilityUniform

GetSourceTypeAttr() → Attribute

Indicates the type of the source.

“raw”: The name should be passed directly to the renderer. This is the default behavior.

“primvar”: This source represents the name of a primvar. Some renderers may use this to ensure that the primvar is provided; other renderers may require that a suitable material network be provided, in which case this is simply an advisory setting.

“lpe”: Specifies a Light Path Expression in the OSL Light Path Expressions language as the source for this RenderVar. Some renderers may use extensions to that syntax, which will necessarily be non- portable.

“intrinsic”: This setting is currently unimplemented, but represents a future namespace for UsdRender to provide portable baseline RenderVars, such as camera depth, that may have varying implementations for each renderer.

Declaration

uniform token sourceType ="raw"

C++ Type

TfToken

Usd Type

SdfValueTypeNames->Token

Variability

SdfVariabilityUniform

Allowed Values

raw, primvar, lpe, intrinsic