usdrt::PhysxSchemaPhysxParticleSystem

Defined in usdrt/scenegraph/usd/physxSchema/physxParticleSystem.h

Functions

usdrt::PhysxSchemaPhysxParticleSystem::CreateContactOffsetAttr: See GetContactOffsetAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateDisplayColorAttr: See GetDisplayColorAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateDisplayOpacityAttr: See GetDisplayOpacityAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateDoubleSidedAttr: See GetDoubleSidedAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateEnableCCDAttr: See GetEnableCCDAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateExtentAttr: See GetExtentAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateFluidRestOffsetAttr: See GetFluidRestOffsetAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateGlobalSelfCollisionEnabledAttr: See GetGlobalSelfCollisionEnabledAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateMaxDepenetrationVelocityAttr: See GetMaxDepenetrationVelocityAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateMaxNeighborhoodAttr: See GetMaxNeighborhoodAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateMaxVelocityAttr: See GetMaxVelocityAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateNonParticleCollisionEnabledAttr: See GetNonParticleCollisionEnabledAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateOrientationAttr: See GetOrientationAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateParticleContactOffsetAttr: See GetParticleContactOffsetAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateParticleSystemEnabledAttr: See GetParticleSystemEnabledAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateProxyPrimRel: See GetProxyPrimRel() , and also Create vs Get Property Methods for when to use Get vs Create.
usdrt::PhysxSchemaPhysxParticleSystem::CreatePurposeAttr: 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateRestOffsetAttr: See GetRestOffsetAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateSimulationOwnerRel: See GetSimulationOwnerRel() , and also Create vs Get Property Methods for when to use Get vs Create.
usdrt::PhysxSchemaPhysxParticleSystem::CreateSolidRestOffsetAttr: See GetSolidRestOffsetAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateSolverPositionIterationCountAttr: See GetSolverPositionIterationCountAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateVisibilityAttr: 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateWindAttr: See GetWindAttr() , 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 .
usdrt::PhysxSchemaPhysxParticleSystem::CreateXformOpOrderAttr: 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 .
usdrt::PhysxSchemaPhysxParticleSystem::Define: Attempt to ensure a UsdPrim adhering to this schema at path is defined (according to UsdPrim::IsDefined()) on this stage.
usdrt::PhysxSchemaPhysxParticleSystem::GetContactOffsetAttr: Contact offset used for collisions with non-particle objects such as rigid or deformable bodies. Must be larger than restOffset. Default value -inf results in a simulation-determined value. Range: (restOffset, inf) Units: distance.
usdrt::PhysxSchemaPhysxParticleSystem::GetDisplayColorAttr: It is useful to have an "official" colorSet that can be used as a display or modeling color, even in the absence of any specified shader for a gprim. DisplayColor serves this role; because it is a UsdGeomPrimvar, it can also be used as a gprim override for any shader that consumes a displayColor parameter.
usdrt::PhysxSchemaPhysxParticleSystem::GetDisplayOpacityAttr: Companion to displayColor that specifies opacity, broken out as an independent attribute rather than an rgba color, both so that each can be independently overridden, and because shaders rarely consume rgba parameters.
usdrt::PhysxSchemaPhysxParticleSystem::GetDoubleSidedAttr: Although some renderers treat all parametric or polygonal surfaces as if they were effectively laminae with outward-facing normals on both sides, some renderers derive significant optimizations by considering these surfaces to have only a single outward side, typically determined by control-point winding order and/or orientation . By doing so they can perform "backface culling" to avoid drawing the many polygons of most closed surfaces that face away from the viewer.
usdrt::PhysxSchemaPhysxParticleSystem::GetEnableCCDAttr: Enable continuous collision detection for particles to help avoid tunneling effects.
usdrt::PhysxSchemaPhysxParticleSystem::GetExtentAttr: Extent is a three dimensional range measuring the geometric extent of the authored gprim in its own local space (i.e. its own transform not applied), without accounting for any shader-induced displacement. If any extent value has been authored for a given Boundable, then it should be authored at every timeSample at which geometry-affecting properties are authored, to ensure correct evaluation via ComputeExtent(). If no extent value has been authored, then ComputeExtent() will call the Boundable's registered ComputeExtentFunction(), which may be expensive, which is why we strongly encourage proper authoring of extent.
usdrt::PhysxSchemaPhysxParticleSystem::GetFluidRestOffsetAttr: Rest offset used for fluid-fluid particle interactions. Must be smaller than particleContactOffset. Default value -inf results in a simulation-determined value. Range: [0, particleContactOffset) Units: distance.
usdrt::PhysxSchemaPhysxParticleSystem::GetGlobalSelfCollisionEnabledAttr: If True, self collisions follow particle-object-specific settings. If False, all particle self collisions are disabled, regardless of any other settings. Improves performance if self collisions are not needed.
usdrt::PhysxSchemaPhysxParticleSystem::GetMaxDepenetrationVelocityAttr: The maximum velocity permitted to be introduced by the solver to depenetrate intersecting particles. Range: [0, inf) Units: distance / seconds.
usdrt::PhysxSchemaPhysxParticleSystem::GetMaxNeighborhoodAttr: The particle neighborhood size.
usdrt::PhysxSchemaPhysxParticleSystem::GetMaxVelocityAttr: Maximum particle velocity. See also cflCoefficient in PhysxPBDMaterialAPI for limiting particle-particle relative velocity. Range: [0, inf) Units: distance / seconds.
usdrt::PhysxSchemaPhysxParticleSystem::GetNonParticleCollisionEnabledAttr: Enable or disable particle collision with nonparticle objects for all particles in the system. Improves performance if nonparticle collisions are not needed.
usdrt::PhysxSchemaPhysxParticleSystem::GetOrientationAttr: Orientation specifies whether the gprim's surface normal should be computed using the right hand rule, or the left hand rule. Please see UsdGeom_WindingOrder for a deeper explanation and generalization of orientation to composed scenes with transformation hierarchies.
usdrt::PhysxSchemaPhysxParticleSystem::GetParticleContactOffsetAttr: Contact offset used for interactions between particles. Must be larger than solid and fluid rest offsets. Range: (max(solidRestOffset, fluidRestOffset), inf) Units: distance.
usdrt::PhysxSchemaPhysxParticleSystem::GetParticleSystemEnabledAttr: Enable or disable the particle system.
usdrt::DestructionSchemaDestructibleBaseAPI::GetPath: Return the SdfPath to this schema object's held prim.
usdrt::DestructionSchemaDestructibleBaseAPI::GetPrim: Return this schema object's held prim.
usdrt::PhysxSchemaPhysxParticleSystem::GetProxyPrimRel: 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:
usdrt::PhysxSchemaPhysxParticleSystem::GetPurposeAttr: 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.
usdrt::PhysxSchemaPhysxParticleSystem::GetRestOffsetAttr: Rest offset used for collisions with non-particle objects such as rigid or deformable bodies. Must be smaller than contact offset. Default value -inf results in a simulation-determined value. Range: [0, contactOffset) Units: distance.
usdrt::PhysxSchemaPhysxParticleSystem::GetSimulationOwnerRel: Single PhysicsScene that simulates this particle system. By default, this is the first PhysicsScene found in the stage using UsdStage::Traverse() .
usdrt::PhysxSchemaPhysxParticleSystem::GetSolidRestOffsetAttr: Rest offset used for solid-solid or solid-fluid particle interactions. Must be smaller than particleContactOffset. Default value -inf results in a simulation-determined value. Range: [0, particleContactOffset) Units: distance.
usdrt::PhysxSchemaPhysxParticleSystem::GetSolverPositionIterationCountAttr: Number of solver iterations for position. Range: [1, 255].
usdrt::PhysxSchemaPhysxParticleSystem::GetVisibilityAttr: 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.
usdrt::PhysxSchemaPhysxParticleSystem::GetWindAttr: The wind applied to the current particle system. Range: (-inf, inf) Units: distance / seconds.
usdrt::PhysxSchemaPhysxParticleSystem::GetXformOpOrderAttr: 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.
usdrt::PhysxSchemaPhysxParticleSystem::PhysxSchemaPhysxParticleSystem: Construct a PhysxSchemaPhysxParticleSystem on the prim held by schemaObj . Should be preferred over PhysxSchemaPhysxParticleSystem (schemaObj.GetPrim()), as it preserves SchemaBase state.
usdrt::PhysxSchemaPhysxParticleSystem::PhysxSchemaPhysxParticleSystem: Construct a PhysxSchemaPhysxParticleSystem on UsdPrim prim . Equivalent to PhysxSchemaPhysxParticleSystem::Get(prim.GetStage(), prim.GetPath()) for a valid prim , but will not immediately throw an error for an invalid prim .
usdrt::PhysxSchemaPhysxParticleSystem::operator bool: Boolean operator.
usdrt::PhysxSchemaPhysxParticleSystem::~PhysxSchemaPhysxParticleSystem: Destructor.

Variables

usdrt::PhysxSchemaPhysxParticleSystem::schemaType: Compile time constant representing what kind of schema this class is.

class PhysxSchemaPhysxParticleSystem : public usdrt::UsdGeomGprim 

WARNING: This is a draft API; the design is not fixed and may change in the future. PhysX particle system, used to simulate fluids, cloth and inflatables. This prim allows the user to configure the solver parameters that are common to the particle objects associated with this system via their particleSystem relationship.

Public Functions

inline explicit PhysxSchemaPhysxParticleSystem(const UsdPrim &prim = UsdPrim()): Construct a PhysxSchemaPhysxParticleSystem on UsdPrim prim. Equivalent to PhysxSchemaPhysxParticleSystem::Get(prim.GetStage(), prim.GetPath()) for a valid prim , but will not immediately throw an error for an invalid prim.

inline explicit PhysxSchemaPhysxParticleSystem(const UsdSchemaBase &schemaObj): Construct a PhysxSchemaPhysxParticleSystem on the prim held by schemaObj . Should be preferred over PhysxSchemaPhysxParticleSystem(schemaObj.GetPrim()), as it preserves SchemaBase state.

inline virtual ~PhysxSchemaPhysxParticleSystem(): 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 GetParticleSystemEnabledAttr() const

Enable or disable the particle system.


Declaration	`bool particleSystemEnabled = 1`
C++ Type	bool
Usd Type	SdfValueTypeNames->Bool

inline UsdAttribute CreateParticleSystemEnabledAttr() const: See GetParticleSystemEnabledAttr(), 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 GetContactOffsetAttr() const

Contact offset used for collisions with non-particle objects such as rigid or deformable bodies. Must be larger than restOffset. Default value -inf results in a simulation-determined value. Range: (restOffset, inf) Units: distance.


Declaration	`float contactOffset = -inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateContactOffsetAttr() const: See GetContactOffsetAttr(), 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 GetRestOffsetAttr() const

Rest offset used for collisions with non-particle objects such as rigid or deformable bodies. Must be smaller than contact offset. Default value -inf results in a simulation-determined value. Range: [0, contactOffset) Units: distance.


Declaration	`float restOffset = -inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateRestOffsetAttr() const: See GetRestOffsetAttr(), 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 GetParticleContactOffsetAttr() const

Contact offset used for interactions between particles. Must be larger than solid and fluid rest offsets. Range: (max(solidRestOffset, fluidRestOffset), inf) Units: distance.


Declaration	`float particleContactOffset = 0.05`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateParticleContactOffsetAttr() const: See GetParticleContactOffsetAttr(), 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 GetSolidRestOffsetAttr() const

Rest offset used for solid-solid or solid-fluid particle interactions. Must be smaller than particleContactOffset. Default value -inf results in a simulation-determined value. Range: [0, particleContactOffset) Units: distance.


Declaration	`float solidRestOffset = -inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateSolidRestOffsetAttr() const: See GetSolidRestOffsetAttr(), 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 GetFluidRestOffsetAttr() const

Rest offset used for fluid-fluid particle interactions. Must be smaller than particleContactOffset. Default value -inf results in a simulation-determined value. Range: [0, particleContactOffset) Units: distance.


Declaration	`float fluidRestOffset = -inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateFluidRestOffsetAttr() const: See GetFluidRestOffsetAttr(), 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 GetEnableCCDAttr() const

Enable continuous collision detection for particles to help avoid tunneling effects.


Declaration	`bool enableCCD = 0`
C++ Type	bool
Usd Type	SdfValueTypeNames->Bool

inline UsdAttribute CreateEnableCCDAttr() const: See GetEnableCCDAttr(), 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 GetSolverPositionIterationCountAttr() const

Number of solver iterations for position. Range: [1, 255].


Declaration	`int solverPositionIterationCount = 16`
C++ Type	int
Usd Type	SdfValueTypeNames->Int

inline UsdAttribute CreateSolverPositionIterationCountAttr() const: See GetSolverPositionIterationCountAttr(), 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 GetMaxDepenetrationVelocityAttr() const

The maximum velocity permitted to be introduced by the solver to depenetrate intersecting particles. Range: [0, inf) Units: distance / seconds.


Declaration	`float maxDepenetrationVelocity = inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateMaxDepenetrationVelocityAttr() const: See GetMaxDepenetrationVelocityAttr(), 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 GetWindAttr() const

The wind applied to the current particle system. Range: (-inf, inf) Units: distance / seconds.


Declaration	`float3 wind = (0, 0, 0)`
C++ Type	GfVec3f
Usd Type	SdfValueTypeNames->Float3

inline UsdAttribute CreateWindAttr() const: See GetWindAttr(), 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 GetMaxNeighborhoodAttr() const

The particle neighborhood size.


Declaration	`int maxNeighborhood = 96`
C++ Type	int
Usd Type	SdfValueTypeNames->Int

inline UsdAttribute CreateMaxNeighborhoodAttr() const: See GetMaxNeighborhoodAttr(), 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 GetMaxVelocityAttr() const

Maximum particle velocity. See also cflCoefficient in PhysxPBDMaterialAPI for limiting particle-particle relative velocity. Range: [0, inf) Units: distance / seconds.


Declaration	`float maxVelocity = inf`
C++ Type	float
Usd Type	SdfValueTypeNames->Float

inline UsdAttribute CreateMaxVelocityAttr() const: See GetMaxVelocityAttr(), 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 GetGlobalSelfCollisionEnabledAttr() const

If True, self collisions follow particle-object-specific settings. If False, all particle self collisions are disabled, regardless of any other settings. Improves performance if self collisions are not needed.


Declaration	`bool globalSelfCollisionEnabled = 1`
C++ Type	bool
Usd Type	SdfValueTypeNames->Bool

inline UsdAttribute CreateGlobalSelfCollisionEnabledAttr() const: See GetGlobalSelfCollisionEnabledAttr(), 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 GetNonParticleCollisionEnabledAttr() const

Enable or disable particle collision with nonparticle objects for all particles in the system. Improves performance if nonparticle collisions are not needed.


Declaration	`bool nonParticleCollisionEnabled = 1`
C++ Type	bool
Usd Type	SdfValueTypeNames->Bool

inline UsdAttribute CreateNonParticleCollisionEnabledAttr() const: See GetNonParticleCollisionEnabledAttr(), 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 GetSimulationOwnerRel() const: Single PhysicsScene that simulates this particle system. By default, this is the first PhysicsScene found in the stage using UsdStage::Traverse().

inline UsdRelationship CreateSimulationOwnerRel() const: See GetSimulationOwnerRel(), and also Create vs Get Property Methods for when to use Get vs Create.

inline UsdAttribute GetDisplayColorAttr() const

It is useful to have an “official” colorSet that can be used as a display or modeling color, even in the absence of any specified shader for a gprim. DisplayColor serves this role; because it is a UsdGeomPrimvar, it can also be used as a gprim override for any shader that consumes a displayColor parameter.


Declaration	`color3f[] primvars:displayColor`
C++ Type	VtArray<GfVec3f>
Usd Type	SdfValueTypeNames->Color3fArray

inline UsdAttribute CreateDisplayColorAttr() const: See GetDisplayColorAttr(), 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 GetDisplayOpacityAttr() const

Companion to displayColor that specifies opacity, broken out as an independent attribute rather than an rgba color, both so that each can be independently overridden, and because shaders rarely consume rgba parameters.


Declaration	`float[] primvars:displayOpacity`
C++ Type	VtArray<float>
Usd Type	SdfValueTypeNames->FloatArray

inline UsdAttribute CreateDisplayOpacityAttr() const: See GetDisplayOpacityAttr(), 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 GetDoubleSidedAttr() const

Although some renderers treat all parametric or polygonal surfaces as if they were effectively laminae with outward-facing normals on both sides, some renderers derive significant optimizations by considering these surfaces to have only a single outward side, typically determined by control-point winding order and/or orientation. By doing so they can perform “backface culling” to avoid drawing the many polygons of most closed surfaces that face away from the viewer.

However, it is often advantageous to model thin objects such as paper and cloth as single, open surfaces that must be viewable from both sides, always. Setting a gprim’s doubleSided attribute to true instructs all renderers to disable optimizations such as backface culling for the gprim, and attempt (not all renderers are able to do so, but the USD reference GL renderer always will) to provide forward-facing normals on each side of the surface for lighting calculations.


Declaration	`uniform bool doubleSided = 0`
C++ Type	bool
Usd Type	SdfValueTypeNames->Bool
Variability	SdfVariabilityUniform

inline UsdAttribute CreateDoubleSidedAttr() const: See GetDoubleSidedAttr(), 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 GetOrientationAttr() const

Orientation specifies whether the gprim’s surface normal should be computed using the right hand rule, or the left hand rule. Please see UsdGeom_WindingOrder for a deeper explanation and generalization of orientation to composed scenes with transformation hierarchies.


Declaration	`uniform token orientation = "rightHanded"`
C++ Type	TfToken
Usd Type	SdfValueTypeNames->Token
Variability	SdfVariabilityUniform
Allowed Values	rightHanded, leftHanded

inline UsdAttribute CreateOrientationAttr() const: See GetOrientationAttr(), 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 GetExtentAttr() const

Extent is a three dimensional range measuring the geometric extent of the authored gprim in its own local space (i.e. its own transform not applied), without accounting for any shader-induced displacement. If any extent value has been authored for a given Boundable, then it should be authored at every timeSample at which geometry-affecting properties are authored, to ensure correct evaluation via ComputeExtent(). If no extent value has been authored, then ComputeExtent() will call the Boundable’s registered ComputeExtentFunction(), which may be expensive, which is why we strongly encourage proper authoring of extent.

An authored extent on a prim which has children is expected to include the extent of all children, as they will be pruned from BBox computation during traversal.