Open Inventor Release 2023.2.3
 
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SoSplitGeometryAction Class Reference

VSG extension Split large geometry into smaller objects to improve culling for multi-pipe rendering. More...

#include <Inventor/actions/SoSplitGeometryAction.h>

+ Inheritance diagram for SoSplitGeometryAction:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoSplitGeometryAction (int divAlongX, int divAlongY)
 
 SoSplitGeometryAction (int divAlongX, int divAlongY, int divAlongZ)
 
void setNumDivisions (int numX, int numY)
 Specifies the number of divisions for splitting an object in 2D.
 
void setNumDivisions (int numX, int numY, int numZ)
 Specifies the number of divisions for splitting an object in 3D.
 
void getNumDivisions (int &numX, int &numY)
 Returns the current division values to split an object in 2D.
 
void getNumDivisions (int &numX, int &numY, int &numZ)
 Returns the current division values to split an object in 3D.
 
void setDistinguishSplitParts (SbBool enable)
 Calling this method before applying the action allows you to see how the action has split the objects.
 
SbBool isDistinguishSplitParts (void)
 Returns TRUE if distinguish split parts is enabled.
 
int getNumObjFound (void)
 Returns how many objects the action has split.
 
void setKeepOriginalGeometry (SbBool enable)
 By default, the action modifies the scene graph by replacing the original node it has split with a new separator containing all the new nodes.
 
SbBool isKeepOriginalGeometry (void)
 Returns TRUE if keep original geometry is enabled.
 
void setSmartSplitting (SbBool enable)
 If this option is set before the action is applied, objects will be split by dividing the greatest bounding box side into the largest number of divisions, the next largest side by the next largest number of divisions, and so on.
 
SbBool isSmartSplitting (void)
 Returns TRUE if smart splitting is enabled.
 
void setTraverseAllSoSwitchChildren (SbBool enable)
 By default the action will only traverse the active child of SoSwitch nodes.
 
int isTraverseAllSoSwitchChildren (void)
 Returns TRUE if traverse all SoSwitch children is enabled.
 
void setMaximumDivisionWarning (SbBool enable)
 There is a maximum number of division to divide an object because this object is composed by some primitives (triangles) that cannot be split without changing the geometry.
 
void setMaintainVertexOrdering (SbBool enable)
 If the initial geometry is composed of SoIndexedTriangleStripSet and uses an SoShapeHints with a known vertex ordering (SoShapeHints::CLOCKWISE or SoShapeHints::COUNTERCLOCKWISE), the action has to maintain the initial vertex ordering or problems with normals will appear.
 
SbBool isMaintainVertexOrdering (void)
 Returns TRUE if the option to maintain initial vertex ordering is on.
 
virtual void apply (SoNode *node)
 Initiates an action on the graph defined by a node.
 
virtual void apply (SoPath *path)
 Initiates an action on the graph defined by a path.
 
virtual void apply (const SoPathList &path_list, SbBool obeys_rules=FALSE)
 Initiates an action on the graph defined by a list of paths.
 
- Public Member Functions inherited from SoAction
virtual ~SoAction ()
 Destructor.
 
virtual void clearApplyResult ()
 When applied, an action may reference nodes or create objects (e.g.
 
virtual void invalidateState ()
 Invalidates the current traversal state in the action, forcing it to be recreated when the action is next applied.
 
void stopActionInBranch ()
 This function stops the action in the current Scene Graph branch.
 
SbBool getContinueActionInBranchFlag () const
 This function indicates if the action must stop in the current branch.
 
void resetContinueActionInBranchFlag ()
 This function resets the continue action flag.
 
void useAlternateRep (const SbBool enable)
 Tell the action to use alternate representations during traversal when available.
 
SbBool isUsingAlternateRep () const
 Returns TRUE if current action is using alternate representations.
 
void setSceneManager (SoSceneManager *mgr)
 Set the scene manager associated with this action (if any ).
 
SoSceneManagergetSceneManager () const
 Return the SoSceneManager associated with this action.
 
virtual void forwardTraversal (SoNode *node)
 Traverse a node that is not part of the current scenegraph.
 
virtual void forwardTraversal (SoPath *path)
 Traverse a path that is not part of the current scenegraph.
 
DistribMode getDistribMode () const
 Returns the distribution mode of this action across a cluster (ScaleViz-Cluster only).
 
AppliedCode getWhatAppliedTo () const
 Returns code indicating what action is being applied to.
 
SoNodegetNodeAppliedTo () const
 Returns the node the action is being applied to.
 
SoPathgetPathAppliedTo () const
 Returns the path the action is being applied to.
 
const SoPathListgetPathListAppliedTo () const
 Returns the path list the action is being applied to.
 
const SoPathListgetOriginalPathListAppliedTo () const
 Returns the original path list the action is being applied to.
 
SbBool isLastPathListAppliedTo () const
 Returns TRUE if the current list is the last one from the original.
 
PathCode getPathCode (int &numIndices, const int *&indices)
 Returns path code based on where current node (the node at the end of the current path) lies with respect to the path(s) the action is being applied to.
 
PathCode getPathCodeMI (int &numIndices, const int *&indices, const int *&instanceIndices)
 Extender API: available to programmers who wish to extend the toolkit
 
void traverse (SoNode *node)
 Does traversal of a graph rooted by a node.
 
SbBool hasTerminated () const
 Returns TRUE if the traversal has reached a termination condition.
 
const SoPathgetCurPath ()
 Returns the path accumulated during traversal, i.e., the chain of nodes from the root of the traversed graph to the current node being traversed.
 
SoStategetState () const
 Gets the state from the action.
 
virtual void setUpState ()
 Creates state if it is NULL or it is no longer valid because new elements have been enabled since it was created.
 
void setPipeId (int id)
 Sets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration.
 
int getPipeId () const
 Gets pipe identifier in the range [1..N] associated to this render action while running a ScaleViz Multipipe configuration.
 
bool isBeingApplied ()
 Returns TRUE if this action is currently being applied.
 
virtual bool preDelayedTraversal ()
 Method called by SoMultiPassManager before delayed pass traversals.
 
virtual void postDelayedTraversal ()
 Method called by SoMultiPassManager after delayed pass traversals.
 
- Public Member Functions inherited from SoTypedObject
SbBool isOfType (const SoType &type) const
 Returns TRUE if this object is of the type specified in type or is derived from that type.
 
template<typename TypedObjectClass >
SbBool isOfType () const
 Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.
 

Static Public Member Functions

static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static void setSplitGeometryActionPreCB (SoSplitGeometryActionCB *, void *)
 These add a callback function to call when a node of the given type is encountered during traversal.
 
- Static Public Member Functions inherited from SoAction
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static void nullAction (SoAction *, SoNode *)
 Null action method that can be stored in lookup table when desired.
 
- Static Public Member Functions inherited from SoTypedObject
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 

Additional Inherited Members

- Public Types inherited from SoAction
enum  DistribMode {
  LOCAL_ONLY ,
  CLUSTER_ONLY ,
  ALL
}
 This is used to define the way an action is distributed across a cluster. More...
 
enum  AppliedCode {
  NODE ,
  PATH ,
  PATH_LIST
}
 This enum is used to determine what the action is being applied to. More...
 
enum  PathCode {
  NO_PATH ,
  IN_PATH ,
  BELOW_PATH ,
  OFF_PATH
}
 This enum may be used during traversal of nodes to indicate where the node is with respect to the path being traversed. More...
 

Detailed Description

VSG extension Split large geometry into smaller objects to improve culling for multi-pipe rendering.

View frustum culling, for example using the SoOctreeOrdering node, is an important optimization, especially for multi-pipe rendering. However, a large object implemented as a single geometry node cannot be effectively culled. For each pipe where the object is partially visible, the entire object must be rendered.

This action splits a large object into multiple geometry nodes, without changing the appearance of the object. Culling can then applied to the new nodes individually.

The scene does not need to be subdivided into a large number of parts. Usually, 5 by 5 is enough to reasonably divide work between the threads. The new objects use the same vertex coordinates (and normals, materials,... if specified) as the original geometry. No triangles are added, removed, or split. A small amount of additional memory is required for the coordinate indices in the new objects.

Note: Currently this action applies only to SoIndexedFaceSet and SoIndexedTriangleStripSet nodes. The new object is the same type of node as the original.

Texture Mapping: If the original geometry has explicit texture coordinates, the result will be correct. If texture coordinates are computed by Open Inventor, the texture will be applied separately to each new object.

SEE ALSO

SoOctreeOrdering, SoIndexedFaceSet, SoIndexedTriangleStripSet, SoShapeHints

Definition at line 79 of file SoSplitGeometryAction.h.

Constructor & Destructor Documentation

◆ SoSplitGeometryAction() [1/2]

SoSplitGeometryAction::SoSplitGeometryAction ( int  divAlongX,
int  divAlongY 
)
Constructor for splitting geometry along 2 dimensions.

By default, the first and second values specify the number of divisions to be used along the object's x and y bounding box dimensions respectively. The doSmartSplitting method() can be used to change which axes of the object's 2D bounding box these division values are applied to.

◆ SoSplitGeometryAction() [2/2]

SoSplitGeometryAction::SoSplitGeometryAction ( int  divAlongX,
int  divAlongY,
int  divAlongZ 
)
Constructor for splitting geometry along 3 dimensions.

By default, these values specify the number of divisions to be used along the object's x, y, and z bounding box dimensions respectively. The doSmartSplitting method() can be used to change which axes of the object's 3D bounding box these division values are applied to. NOTE: Do not use this constructor to split a scene containing flat objects.

Member Function Documentation

◆ apply() [1/3]

virtual void SoSplitGeometryAction::apply ( const SoPathList pathList,
SbBool  obeysRules = FALSE 
)
inlinevirtual

Initiates an action on the graph defined by a list of paths.

TRUE can be passed for the obeysRules flag if the given path list has the following 4 properties:

  1. All paths have the same head node.
  2. Paths are sorted in traversal order.
  3. If one path ends at node A, no other path continues through A.
  4. No two paths are the same.

These rules will be obeyed by path lists returned by picking and by searches for non-group nodes.

Reimplemented from SoAction.

Definition at line 248 of file SoSplitGeometryAction.h.

◆ apply() [2/3]

virtual void SoSplitGeometryAction::apply ( SoNode node)
virtual

Initiates an action on the graph defined by a node.

Warning: Most actions call ref() on the node before traversing the scene graph, then call unref() after traversal. If the node's reference count was zero (the default), the call to apply() will cause it to be destroyed.

Reimplemented from SoAction.

◆ apply() [3/3]

virtual void SoSplitGeometryAction::apply ( SoPath path)
inlinevirtual

Initiates an action on the graph defined by a path.

Warning: Most actions call ref() on the path before traversing the scene graph, then call unref() after traversal. If the path's reference count was zero (the default), the call to apply() will cause it to be destroyed.

Reimplemented from SoAction.

Definition at line 247 of file SoSplitGeometryAction.h.

◆ getClassTypeId()

static SoType SoSplitGeometryAction::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getNumDivisions() [1/2]

void SoSplitGeometryAction::getNumDivisions ( int &  numX,
int &  numY 
)

Returns the current division values to split an object in 2D.

◆ getNumDivisions() [2/2]

void SoSplitGeometryAction::getNumDivisions ( int &  numX,
int &  numY,
int &  numZ 
)

Returns the current division values to split an object in 3D.

◆ getNumObjFound()

int SoSplitGeometryAction::getNumObjFound ( void  )

Returns how many objects the action has split.

This method must be called after the action has been applied.

◆ getTypeId()

virtual SoType SoSplitGeometryAction::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Implements SoTypedObject.

◆ isDistinguishSplitParts()

SbBool SoSplitGeometryAction::isDistinguishSplitParts ( void  )

Returns TRUE if distinguish split parts is enabled.

◆ isKeepOriginalGeometry()

SbBool SoSplitGeometryAction::isKeepOriginalGeometry ( void  )

Returns TRUE if keep original geometry is enabled.

◆ isMaintainVertexOrdering()

SbBool SoSplitGeometryAction::isMaintainVertexOrdering ( void  )

Returns TRUE if the option to maintain initial vertex ordering is on.

◆ isSmartSplitting()

SbBool SoSplitGeometryAction::isSmartSplitting ( void  )

Returns TRUE if smart splitting is enabled.

◆ isTraverseAllSoSwitchChildren()

int SoSplitGeometryAction::isTraverseAllSoSwitchChildren ( void  )

Returns TRUE if traverse all SoSwitch children is enabled.

◆ setDistinguishSplitParts()

void SoSplitGeometryAction::setDistinguishSplitParts ( SbBool  enable)

Calling this method before applying the action allows you to see how the action has split the objects.

Each new SoIndexedShape is assigned a unique material. Default is FALSE.

◆ setKeepOriginalGeometry()

void SoSplitGeometryAction::setKeepOriginalGeometry ( SbBool  enable)

By default, the action modifies the scene graph by replacing the original node it has split with a new separator containing all the new nodes.

The behavior can be changed by a call to this method. Instead of replacing the node with a separator, the original node is replaced with an SoSwitch node containing the original node and the separator containing all the new nodes. Each new SoSwitch node added in the scene graph is named "switchX" where X is the Xth object split. For instance, the first object split by the action will have a corresponding switch node named "switch0". Default is FALSE.

◆ setMaintainVertexOrdering()

void SoSplitGeometryAction::setMaintainVertexOrdering ( SbBool  enable)

If the initial geometry is composed of SoIndexedTriangleStripSet and uses an SoShapeHints with a known vertex ordering (SoShapeHints::CLOCKWISE or SoShapeHints::COUNTERCLOCKWISE), the action has to maintain the initial vertex ordering or problems with normals will appear.

A call to this function will maintain initial vertex ordering. Default is TRUE.

◆ setMaximumDivisionWarning()

void SoSplitGeometryAction::setMaximumDivisionWarning ( SbBool  enable)

There is a maximum number of division to divide an object because this object is composed by some primitives (triangles) that cannot be split without changing the geometry.

If one of the arguments specified in the constructor is greater than this maximum division value, then the action will naturally split the object with the maximum division it is possible to. A call to this function enable Inventor warnings to know if you've reached this maximum value. Turning it on will slow the action traversal because, to know if the division value is good or not, the length average of every primitives is calculated. Inventor warnings are Off by default.

◆ setNumDivisions() [1/2]

void SoSplitGeometryAction::setNumDivisions ( int  numX,
int  numY 
)

Specifies the number of divisions for splitting an object in 2D.

By default, these values specify the number of divisions to be used along the object's x, y, and z bounding box dimensions respectively. The doSmartSplitting method() can be used to change which axes of the object's 3D bounding box these division values are applied to.

◆ setNumDivisions() [2/2]

void SoSplitGeometryAction::setNumDivisions ( int  numX,
int  numY,
int  numZ 
)

Specifies the number of divisions for splitting an object in 3D.

By default, these values specify the number of divisions to be used along the object's x, y, and z bounding box dimensions respectively. The doSmartSplitting method() can be used to change which axes of the object's 3D bounding box these division values are applied to.

◆ setSmartSplitting()

void SoSplitGeometryAction::setSmartSplitting ( SbBool  enable)

If this option is set before the action is applied, objects will be split by dividing the greatest bounding box side into the largest number of divisions, the next largest side by the next largest number of divisions, and so on.

Otherwise the action will divide objects by using the first division value given in the constructor for the x side of the bounding box, the second for y, and so on. Default is FALSE.

◆ setSplitGeometryActionPreCB()

static void SoSplitGeometryAction::setSplitGeometryActionPreCB ( SoSplitGeometryActionCB ,
void *   
)
static

These add a callback function to call when a node of the given type is encountered during traversal.

The PreCallback is called just before the node is traversed. For each node to split, you can "customize" how to split it by enabling, or disabling options, changing the division values, etc.

◆ setTraverseAllSoSwitchChildren()

void SoSplitGeometryAction::setTraverseAllSoSwitchChildren ( SbBool  enable)

By default the action will only traverse the active child of SoSwitch nodes.

A call to this method tells the action to traverse all children. Default is FALSE.


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