Base class for scene graph DAG nodes. More...

#include <RixSceneGraph.h>

Inherited by AnalyticLight [virtual], Camera [virtual], ClippingPlane [virtual], and Geometry [virtual].

Public Member Functions
virtual DagType	GetDagType () const =0
	Get the DAG type. More...

virtual RtUString	GetIdentifier () const =0
	Return the DAG node identifier. More...

virtual Error	SetIdentifier (RtUString identifier)=0
	Set the DAG node identifier. More...

virtual Error	SetTransform (unsigned numsamples, RtMatrix4x4 const xforms, float const times)=0
	Set the transform. More...

virtual Error	SetTransformNumSamples (unsigned numsamples)=0
	Set the number of transform motion samples. More...

virtual Error	SetTransformSample (unsigned sample, RtMatrix4x4 const &xform, float time)=0
	Set a single transform motion sample. More...

Error	SetTransform (RtMatrix4x4 const &xform)
	Set a static transform. More...

Error	SetIdentity ()
	Set the identity transform. More...

virtual unsigned	GetTransformNumSamples () const =0
	Return the number of transform motion samples. More...

virtual Error	GetTransformSample (unsigned sample, RtMatrix4x4 &xform, float &time) const =0
	Get a single transform motion sample. More...

virtual Error	SetHidden (int state)=0
	Set hidden state. More...

virtual int	GetHidden () const =0
	Get hidden state. More...

virtual Error	AddCoordinateSystem (Group *coordsys)=0
	Add scoped coordinate system. More...

virtual Error	RemoveCoordinateSystem (Group *coordsys)=0
	Remove scoped coordinate system. More...

virtual Error	RemoveAllCoordinateSystems ()=0
	Remove all scoped coordinate systems. More...

virtual unsigned	GetNumCoordinateSystems () const =0
	Get the number of scoped coordinate systems. More...

virtual Group *	GetCoordinateSystem (unsigned idx) const =0
	Get scoped coordinate system by index. More...

virtual Error	AddChild (Group *child)=0
	Add a child DAG node. More...

virtual Error	RemoveChild (Group *child)=0
	Remove a child DAG node. More...

virtual Error	RemoveAllChildren ()=0
	Remove all child DAG nodes. More...

virtual unsigned	GetNumChildren () const =0
	Return the number of child nodes. More...

virtual Group *	GetChild (unsigned idx) const =0
	Return a pointer to any child DAG nodes. More...

virtual unsigned	GetNumParents () const =0
	Return the number of parent nodes. More...

virtual Group *	GetParent (unsigned idx) const =0
	Return a pointer to any parent DAG nodes. More...

virtual Group *	FindDagNode (char const *path) const =0
	Find a DAG node from a identifier path. More...

virtual Material *	GetMaterial () const =0
	Get material binding. More...

virtual Error	SetMaterial (Material *material)=0
	Set material binding. More...

virtual Error	OverrideMaterial (Material material, unsigned depth, Group *path)=0
	Override material binding. More...

virtual RtParamList const &	GetAttributes () const =0
	Get attribute list. More...

virtual Error	SetAttributes (RtParamList const &attributes)=0
	Set attribute list. More...

virtual Error	SetNested (bool state)=0
	Set nesting state. More...

virtual bool	GetNested () const =0
	Get nesting state. More...

virtual Error	SetInheritTransform (bool value)=0
	Set inherit transform. More...

virtual bool	GetInheritTransform () const =0
	Return inherit transform. More...

	Group ()=default

virtual	~Group ()=default

Detailed Description

Base class for scene graph DAG nodes.

DAG (directed acyclic graph) nodes exhibit parent-child relationships with other DAG nodes to describe scene hierarchy. They are used to represent basic scene primitives such as transforms, cameras, lights, and geometry.

Constructor & Destructor Documentation

◆ Group()

Group::Group ( )

inlinedefault

◆ ~Group()

virtual Group::~Group ( )

virtualdefault

Member Function Documentation

◆ AddChild()

virtual Error Group::AddChild ( Group * child )

pure virtual

Add a child DAG node.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::RemoveChild; Group::RemoveAllChildren; Group::GetNumChildren; Group::GetChild; Group::GetNumParents; Group::GetParent; Scene::Root

Parameters

[in] child The child DAG node

Returns: Error code

◆ AddCoordinateSystem()

virtual Error Group::AddCoordinateSystem ( Group * coordsys )

pure virtual

Add scoped coordinate system.

The object-to-world transformation of coordsys nodes are inherited as a named coordinate system that may be used for shading. Transformations are resolved as the closest unique relative path between this node and the coordsys node. Ambiguous instance transformations are ignored.

See also: Group::RemoveCoordinateSystem; Group::RemoveAllCoordinateSystems; Group::GetNumCoordinateSystems; Group::GetCoordinateSystem

Parameters

[in] coordsys The coordinate system node

Returns: Error code

◆ FindDagNode()

virtual Group* Group::FindDagNode ( char const * path ) const

pure virtual

Find a DAG node from a identifier path.

Returns a DAG node based on the string identifier path relative to this node. DAG node paths should use the same separator given to Manager::CreateScene.

See also: Group::SetIdentifier; Manager::CreateScene

Parameters

[in] path Identifier path

Returns: The DAG node. Returns nullptr when the specified node cannot be found.

◆ GetAttributes()

virtual RtParamList const& Group::GetAttributes ( ) const

pure virtual

Get attribute list.

Parameters that are attached to scene graph DAG nodes and may vary per geometry instance are called attributes. In the scene graph, attribute state is inherited by updating parameters along DAG hierarchies to generate the instance attribute list used for rendering. Attributes define instance properties such as visibility as well as user parameters used for instance variation when shading.

See also: Group::SetAttributes

Returns: Attribute list

◆ GetChild()

virtual Group* Group::GetChild ( unsigned idx ) const

pure virtual

Return a pointer to any child DAG nodes.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveChild; Group::RemoveAllChildren; Group::GetNumChildren; Group::GetNumParents; Group::GetParent; Scene::Root

Parameters

[in] idx The child index

Returns: The child node or nullptr for invalid index

◆ GetCoordinateSystem()

virtual Group* Group::GetCoordinateSystem ( unsigned idx ) const

pure virtual

Get scoped coordinate system by index.

The object-to-world transformation of coordsys nodes are inherited as a named coordinate system that may be used for shading. Transformations are resolved as the closest unique relative path between this node and the coordsys node. Ambiguous instance transformations are ignored.

See also: Group::AddCoordinateSystem; Group::RemoveCoordinateSystem; Group::RemoveAllCoordinateSystems; Group::GetNumCoordinateSystems

Parameters

[in] idx The coordinate system index

Returns: Coordinate system node or nullptr for invalid index

◆ GetDagType()

virtual DagType Group::GetDagType ( ) const

pure virtual

Get the DAG type.

The DAG type describes the role of the scene graph node. For example: Group, Camera, Mesh, etc..

Returns: DAG type

◆ GetHidden()

virtual int Group::GetHidden ( ) const

pure virtual

Get hidden state.

Hidden objects are not visible in render but may still contribute as coordinate systems. The hidden state is inherited when unspecified. The default is unspecified.

See also: Group::SetHidden

Returns: Hidden state Hidden state: -1 (unspecified), 0 (unhide), 1 (hide)

◆ GetIdentifier()

virtual RtUString Group::GetIdentifier ( ) const

pure virtual

Return the DAG node identifier.

Node identifiers are concatenated along DAG hierarchies to uniquely identify DAG paths. Node identifiers themselves do not need to be unique.

See also: Group::SetIdentifier

Returns: The DAG node identifier

◆ GetInheritTransform()

virtual bool Group::GetInheritTransform ( ) const

pure virtual

Return inherit transform.

Enable or disable inheriting parent transformations when generating the object-to-world transform. The default is true.

See also: Group::SetInheritTransform

Returns: Enable/disable inherit transform

◆ GetMaterial()

virtual Material* Group::GetMaterial ( ) const

pure virtual

Get material binding.

Material bindings determine the active bxdf, displacement, and light and light filter shading graph assignments. Materials bindings are inherited and may vary per instance.

See also: Group::SetMaterial; Group::OverrideMaterial

Returns: Currently bound material container or nullptr if unbound

◆ GetNested()

virtual bool Group::GetNested ( ) const

pure virtual

Get nesting state.

Nested DAGs avoid flattening during scene transveral. This can reduce memory consumption for heavily nested structures at the cost of slower ray traversal. The default is false.

See also: Group::SetNested

Returns: Nested state

◆ GetNumChildren()

virtual unsigned Group::GetNumChildren ( ) const

pure virtual

Return the number of child nodes.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveChild; Group::RemoveAllChildren; Group::GetChild; Group::GetNumParents; Group::GetParent; Scene::Root

Returns: The number of children

◆ GetNumCoordinateSystems()

virtual unsigned Group::GetNumCoordinateSystems ( ) const

pure virtual

Get the number of scoped coordinate systems.

The object-to-world transformation of coordsys nodes are inherited as a named coordinate system that may be used for shading. Transformations are resolved as the closest unique relative path between this node and the coordsys node. Ambiguous instance transformations are ignored.

See also: Group::AddCoordinateSystem; Group::RemoveCoordinateSystem; Group::RemoveAllCoordinateSystems; Group::GetCoordinateSystem

Returns: The number of coordinate system nodes

◆ GetNumParents()

virtual unsigned Group::GetNumParents ( ) const

pure virtual

Return the number of parent nodes.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveChild; Group::RemoveAllChildren; Group::GetNumChildren; Group::GetChild; Group::GetParent; Scene::Root

Returns: The number of parents

◆ GetParent()

virtual Group* Group::GetParent ( unsigned idx ) const

pure virtual

Return a pointer to any parent DAG nodes.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveChild; Group::RemoveAllChildren; Group::GetNumChildren; Group::GetChild; Group::GetNumParents; Scene::Root

Parameters

[in] idx The parent index

Returns: The parent node or nullptr for invalid index

◆ GetTransformNumSamples()

virtual unsigned Group::GetTransformNumSamples ( ) const

pure virtual

Return the number of transform motion samples.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. The motion sample count may be set independently of the actual motion sample values.

See also: Group::SetTransformNumSamples

Returns: The number of motion samples

◆ GetTransformSample()

virtual Error Group::GetTransformSample	(	unsigned	sample,
		RtMatrix4x4 &	xform,
		float &	time
	)		const

pure virtual

Get a single transform motion sample.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. Motion sample values may be set independently of the motion sample count.

See also: Group::SetTransformSample

Parameters

[in]	sample	Motion sample index
[out]	xform	Matrix sample
[out]	time	Time sample

Returns: Error code

◆ OverrideMaterial()

virtual Error Group::OverrideMaterial	(	Material *	material,
		unsigned	depth,
		Group **	path
	)

pure virtual

Override material binding.

Material bindings determine the active bxdf, displacement, and light and light filter shading graph assignments. Materials bindings are inherited and may vary per instance. Material binding may be overriden based on a relative DAG path where the terminal node should be this node.

See also: Group::SetMaterial; Group::GetMaterial

Parameters

[in]	material	The material container
[in]	depth	The DAG path depth or zero to remove all overrides.
[in]	path	The DAG path

Returns: Error code

◆ RemoveAllChildren()

virtual Error Group::RemoveAllChildren ( )

pure virtual

Remove all child DAG nodes.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveChild; Group::GetNumChildren; Group::GetChild; Group::GetNumParents; Group::GetParent; Scene::Root

Returns: Error code

◆ RemoveAllCoordinateSystems()

virtual Error Group::RemoveAllCoordinateSystems ( )

pure virtual

Remove all scoped coordinate systems.

The object-to-world transformation of coordsys nodes are inherited as a named coordinate system that may be used for shading. Transformations are resolved as the closest unique relative path between this node and the coordsys node. Ambiguous instance transformations are ignored.

See also: Group::AddCoordinateSystem; Group::RemoveCoordinateSystem; Group::GetNumCoordinateSystems; Group::GetCoordinateSystem

Returns: Error code

◆ RemoveChild()

virtual Error Group::RemoveChild ( Group * child )

pure virtual

Remove a child DAG node.

The scene graph DAG hierarchy is constructed of parent-child relationships where children nodes inherit instance properties from parent nodes such as transformation, attribute state, and coordinate systems. An object is considered instanced when it is reachable from the scene root via multiple DAG paths. These DAG paths are formed when a child node has multiple parents. In order to form unique DAG paths, node identifiers should be unique among children.

See also: Group::AddChild; Group::RemoveAllChildren; Group::GetNumChildren; Group::GetChild; Group::GetNumParents; Group::GetParent; Scene::Root

Parameters

[in] child The child DAG node

Returns: Error code

◆ RemoveCoordinateSystem()

virtual Error Group::RemoveCoordinateSystem ( Group * coordsys )

pure virtual

Remove scoped coordinate system.

The object-to-world transformation of coordsys nodes are inherited as a named coordinate system that may be used for shading. Transformations are resolved as the closest unique relative path between this node and the coordsys node. Ambiguous instance transformations are ignored.

See also: Group::AddCoordinateSystem; Group::RemoveAllCoordinateSystems; Group::GetNumCoordinateSystems; Group::GetCoordinateSystem

Parameters

[in] coordsys The coordinate system node

Returns: Error code

◆ SetAttributes()

virtual Error Group::SetAttributes ( RtParamList const & attributes )

pure virtual

Set attribute list.

Parameters that are attached to scene graph DAG nodes and may vary per geometry instance are called attributes. In the scene graph, attribute state is inherited by updating parameters along DAG hierarchies to generate the instance attribute list used for rendering. Attributes define instance properties such as visibility as well as user parameters used for instance variation when shading.

See also: Group::GetAttributes

Parameters

[in] attributes Attribute list

Returns: Error code

◆ SetHidden()

virtual Error Group::SetHidden ( int state )

pure virtual

Set hidden state.

Hidden objects are visible in render but may still contribute as coordinate systems. The hidden state is inherited when unspecified. The default is unspecified.

See also: Group::GetHidden

Parameters

[in] state Hidden state: -1 (unspecified), 0 (unhide), 1 (hide)

Returns: Error code

◆ SetIdentifier()

virtual Error Group::SetIdentifier ( RtUString identifier )

pure virtual

Set the DAG node identifier.

Node identifiers are concatenated along DAG hierarchies to uniquely identify DAG paths. Node identifiers themselves do not need to be unique.

See also: Group::GetIdentifier

Parameters

[in] identifier The DAG node identifier

Returns: Error code

◆ SetIdentity()

Error Group::SetIdentity ( )

inline

Set the identity transform.

Identity transforms are concatenated together along DAG hierarchies to generate the object-to-world transform.

See also: Group::SetTransform

Returns: Error code

References SetTransformNumSamples().

◆ SetInheritTransform()

virtual Error Group::SetInheritTransform ( bool value )

pure virtual

Set inherit transform.

Enable or disable inheriting parent transformations when generating the object-to-world transform. The default is true.

See also: Group::SetTransform; Group::GetInheritTransform

Parameters

[in] value Enable/disable inherit transform

Returns: Error code

◆ SetMaterial()

virtual Error Group::SetMaterial ( Material * material )

pure virtual

Set material binding.

Material bindings determine the active bxdf, displacement, and light and light filter shading graph assignments. Materials bindings are inherited and may vary per instance.

See also: Group::GetMaterial; Group::OverrideMaterial

Parameters

[in] material The material container or nullptr to unbind

Returns: Error code

◆ SetNested()

virtual Error Group::SetNested ( bool state )

pure virtual

Set nesting state.

Nested DAGs avoid flattening during scene transveral. This can reduce memory consumption for heavily nested structures at the cost of slower ray traversal. The default is false.

See also: Group::GetNested

Parameters

[in] state Nested state

Returns: Error code

◆ SetTransform() [1/2]

virtual Error Group::SetTransform	(	unsigned	numsamples,
		RtMatrix4x4 const *	xforms,
		float const *	times
	)

pure virtual

Set the transform.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. Static transforms are described by a single matrix while motion transforms contain a matrix and time value per time sample.

See also: Group::SetIdentity; Group::SetInheritTransform

Parameters

[in]	numsamples	The number of motion samples. A zero value sets the transform to identity.
[in]	xforms	Matrix samples pointer. This value must be valid for numsamples greater or equal to one.
[in]	times	Time samples pointer. This value must be valid for numsamples greater or equal to two. A zero time is assumed for numsamples of one.

Returns: Error code

Referenced by SetTransform().

◆ SetTransform() [2/2]

Error Group::SetTransform ( RtMatrix4x4 const & xform )

inline

Set a static transform.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. Static transforms are described by a single matrix while motion transforms contain a matrix and time value per motion sample.

See also: Group::SetTransform

Parameters

[in] xform Static matrix

Returns: Error code

References SetTransform().

◆ SetTransformNumSamples()

virtual Error Group::SetTransformNumSamples ( unsigned numsamples )

pure virtual

Set the number of transform motion samples.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. The motion sample count may be set independently of the actual motion sample values.

See also: Group::SetTransform; Group::GetTransformNumSamples

Parameters

[in] numsamples The number of motion samples. A zero value sets the transform to identitiy.

Returns: Error code

Referenced by SetIdentity().

◆ SetTransformSample()

virtual Error Group::SetTransformSample	(	unsigned	sample,
		RtMatrix4x4 const &	xform,
		float	time
	)

pure virtual

Set a single transform motion sample.

Transforms are concatenated together along DAG hierarchies to generate the object-to-world transform. Motion sample values may be set independently of the motion sample count.

See also: Group::SetTransform; Group::GetTransformSample

Parameters

[in]	sample	Motion sample index
[in]	xform	Matrix sample
[in]	time	Time sample

Returns: Error code

The documentation for this class was generated from the following file:

RixSceneGraph.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ Group()

◆ ~Group()

Member Function Documentation

◆ AddChild()

◆ AddCoordinateSystem()

◆ FindDagNode()

◆ GetAttributes()

◆ GetChild()

◆ GetCoordinateSystem()

◆ GetDagType()

◆ GetHidden()

◆ GetIdentifier()

◆ GetInheritTransform()

◆ GetMaterial()

◆ GetNested()

◆ GetNumChildren()

◆ GetNumCoordinateSystems()

◆ GetNumParents()

◆ GetParent()

◆ GetTransformNumSamples()

◆ GetTransformSample()

◆ OverrideMaterial()

◆ RemoveAllChildren()

◆ RemoveAllCoordinateSystems()

◆ RemoveChild()

◆ RemoveCoordinateSystem()

◆ SetAttributes()

◆ SetHidden()

◆ SetIdentifier()

◆ SetIdentity()

◆ SetInheritTransform()

◆ SetMaterial()

◆ SetNested()

◆ SetTransform() [1/2]

◆ SetTransform() [2/2]

◆ SetTransformNumSamples()

◆ SetTransformSample()