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SoGroup Class Reference

The SoGroup class is a node which managed other node instances. More...

#include <Inventor/nodes/SoGroup.h>

Inheritance diagram for SoGroup:
SoNode SoFieldContainer SoBase SoArray SoLevelOfDetail SoLOD SoMultipleCopy SoPathSwitch SoSeparator SoSwitch SoTransformSeparator SoVRMLLOD SoVRMLParent SoVRMLSwitch

Public Member Functions

virtual SoType getTypeId (void) const
 Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting. More...
 
 SoGroup (void)
 
 SoGroup (int nchildren)
 
virtual void addChild (SoNode *node)
 
virtual void insertChild (SoNode *child, int newchildindex)
 
virtual SoNodegetChild (int index) const
 
virtual int findChild (const SoNode *node) const
 
virtual int getNumChildren (void) const
 
virtual void removeChild (int childindex)
 
virtual void removeChild (SoNode *child)
 
virtual void removeAllChildren (void)
 
virtual void replaceChild (int index, SoNode *newchild)
 
virtual void replaceChild (SoNode *oldchild, SoNode *newchild)
 
virtual void doAction (SoAction *action)
 
virtual void GLRender (SoGLRenderAction *action)
 
virtual void callback (SoCallbackAction *action)
 
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
 
virtual void getMatrix (SoGetMatrixAction *action)
 
virtual void handleEvent (SoHandleEventAction *action)
 
virtual void pick (SoPickAction *action)
 
virtual void search (SoSearchAction *action)
 
virtual void write (SoWriteAction *action)
 
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
 
virtual void audioRender (SoAudioRenderAction *action)
 
virtual SoChildListgetChildren (void) const
 
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
 
- Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
 
SbBool isOverride (void) const
 
void setNodeType (const NodeType type)
 
NodeType getNodeType (void) const
 
virtual SoNodecopy (SbBool copyconnections=FALSE) const
 
virtual SbBool affectsState (void) const
 
virtual void GLRenderBelowPath (SoGLRenderAction *action)
 
virtual void GLRenderInPath (SoGLRenderAction *action)
 
virtual void GLRenderOffPath (SoGLRenderAction *action)
 
virtual void rayPick (SoRayPickAction *action)
 
virtual void grabEventsSetup (void)
 
virtual void grabEventsCleanup (void)
 
virtual void startNotify (void)
 
virtual void notify (SoNotList *l)
 
SbUniqueId getNodeId (void) const
 
virtual void writeInstance (SoOutput *out)
 
virtual SoNodeaddToCopyDict (void) const
 
virtual SoFieldContainercopyThroughConnection (void) const
 
- Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
 
SbBool hasDefaultValues (void) const
 
SbBool fieldsAreEqual (const SoFieldContainer *container) const
 
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
 
SbBool set (const char *const fielddata)
 
void get (SbString &fielddata)
 
virtual int getFields (SoFieldList &l) const
 
virtual int getAllFields (SoFieldList &l) const
 
virtual SoFieldgetField (const SbName &name) const
 
virtual SoFieldgetEventIn (const SbName &name) const
 
virtual SoFieldgetEventOut (const SbName &name) const
 
SbBool getFieldName (const SoField *const field, SbName &name) const
 
SbBool enableNotify (const SbBool flag)
 
SbBool isNotifyEnabled (void) const
 
SbBool set (const char *fielddata, SoInput *input)
 
void get (SbString &fielddata, SoOutput *out)
 
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
 
SbBool getIsBuiltIn (void) const
 
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
 
void setUserData (void *userdata) const
 
void * getUserData (void) const
 
- Public Member Functions inherited from SoBase
void ref (void) const
 
void unref (void) const
 
void unrefNoDelete (void) const
 
int32_t getRefCount (void) const
 
void touch (void)
 
SbBool isOfType (SoType type) const
 Returns TRUE if the type of this object is either of the same type or inherited from type. More...
 
virtual SbName getName (void) const
 
virtual void setName (const SbName &newname)
 
void addAuditor (void *const auditor, const SoNotRec::Type type)
 
void removeAuditor (void *const auditor, const SoNotRec::Type type)
 
const SoAuditorListgetAuditors (void) const
 
SbBool shouldWrite (void)
 
void assertAlive (void) const
 

Static Public Member Functions

static SoType getClassTypeId (void)
 
static void initClass (void)
 
- Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
 
static SoType getClassTypeId (void)
 
static SoNodegetByName (const SbName &name)
 
static int getByName (const SbName &name, SoNodeList &l)
 
static void initClass (void)
 
static void initClasses (void)
 
static SbUniqueId getNextNodeId (void)
 
static int getActionMethodIndex (const SoType type)
 
static void getBoundingBoxS (SoAction *action, SoNode *node)
 
static void GLRenderS (SoAction *action, SoNode *node)
 
static void callbackS (SoAction *action, SoNode *node)
 
static void getMatrixS (SoAction *action, SoNode *node)
 
static void handleEventS (SoAction *action, SoNode *node)
 
static void pickS (SoAction *action, SoNode *node)
 
static void rayPickS (SoAction *action, SoNode *node)
 
static void searchS (SoAction *action, SoNode *node)
 
static void writeS (SoAction *action, SoNode *node)
 
static void audioRenderS (SoAction *action, SoNode *node)
 
static void getPrimitiveCountS (SoAction *action, SoNode *node)
 
- Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
 
static SoType getClassTypeId (void)
 
static void cleanupClass (void)
 
static void initCopyDict (void)
 
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
 
static SoFieldContainercheckCopy (const SoFieldContainer *orig)
 
static SoFieldContainerfindCopy (const SoFieldContainer *orig, const SbBool copyconnections)
 
static void copyDone (void)
 
- Static Public Member Functions inherited from SoBase
static void initClass (void)
 Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
 
static SoType getClassTypeId (void)
 This static method returns the SoType object associated with objects of this class.
 
static void addName (SoBase *const base, const char *const name)
 
static void removeName (SoBase *const base, const char *const name)
 
static void incrementCurrentWriteCounter (void)
 
static void decrementCurrentWriteCounter (void)
 
static SoBasegetNamedBase (const SbName &name, SoType type)
 
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
 
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
 
static void setInstancePrefix (const SbString &c)
 
static void setTraceRefs (SbBool trace)
 
static SbBool getTraceRefs (void)
 
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
 
static SbBool readRoute (SoInput *input)
 

Protected Member Functions

virtual const SoFieldDatagetFieldData (void) const
 
virtual ~SoGroup ()
 
virtual SbBool readInstance (SoInput *in, unsigned short flags)
 
virtual SbBool readChildren (SoInput *in)
 
virtual void copyContents (const SoFieldContainer *from, SbBool copyconnections)
 
virtual SoNotRec createNotRec (void)
 
void setOperation (const SoNotRec::OperationType opType=SoNotRec::UNSPECIFIED, const SoNode *cc=NULL, const SoNode *pc=NULL, const int ci=-1)
 
- Protected Member Functions inherited from SoNode
 SoNode (void)
 
virtual ~SoNode ()
 
- Protected Member Functions inherited from SoFieldContainer
 SoFieldContainer (void)
 
virtual ~SoFieldContainer ()
 
- Protected Member Functions inherited from SoBase
 SoBase (void)
 
virtual ~SoBase ()
 
virtual void destroy (void)
 
SbBool hasMultipleWriteRefs (void) const
 
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
 
void writeFooter (SoOutput *out) const
 
virtual const char * getFileFormatName (void) const
 

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)
 
- Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
 
static void setNextActionMethodIndex (int index)
 
static int getNextActionMethodIndex (void)
 
static void incNextActionMethodIndex (void)
 
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
 
- Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
 
static void staticDataLock (void)
 
static void staticDataUnlock (void)
 

Protected Attributes

SoChildListchildren
 
- Protected Attributes inherited from SoNode
SbUniqueId uniqueId
 
- Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn
 

Additional Inherited Members

- Public Types inherited from SoNode
enum  NodeType {
  INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004,
  INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040,
  COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400,
  COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000,
  COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000, COIN_4_0 = 0x20000
}
 
- Protected Types inherited from SoBase
enum  BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }
 
- Static Protected Attributes inherited from SoNode
static SbUniqueId nextUniqueId = 1
 
static int nextActionMethodIndex = 0
 

Detailed Description

The SoGroup class is a node which managed other node instances.

The internal scene data structures in Coin are managed as directed graphs. The graphs are built by setting up a hierarchy through the use of group nodes (either of this type, or from subclasses like SoSeparator) which is then traversed when applying actions (like SoGLRenderAction) to it.

SoGroup, SoSeparator, and other classes derived from SoGroup, are the "tools" the application programmer uses when making the layout of the scene graph.

An often asked question about SoGroup nodes is: "Why is there no SoGroup::getParent() method?" The answer to this is that nodes in the scene graph can have multiple parents, so a simple getParent() method wouldn't work. If you have a node pointer (or other node identification) of a node that you want to remove from the scene graph, what you need to do is to use an SoSearchAction to find all paths down to the node, and then invoke SoGroup::removeChild() from all found parents of the node.

The function would look something like this:

void getParents(SoNode * node, SoNode * root, SoPathList & parents)
{
sa.setNode(node);
sa.setInterest(SoSearchAction::ALL);
sa.apply(root);
parents = sa.getPaths();
}

Or if you know that your node of interest has only a single parent:

SoGroup * getParent(SoNode * node, SoNode * root)
{
sa.setNode(node);
sa.setInterest(SoSearchAction::FIRST);
sa.apply(root);
SoPath * p = sa.getPath();
assert(p && "not found");
if (p->getLength() < 2) { return NULL; } // no parent
return (SoGroup *)p->getNodeFromTail(1);
}

An important note about a potential problem using SoGroup nodes which it is not common to stumble on, but which makes hard to find bugs when one does: you should not change the scene graph layout during any action traversal, as that is not allowed by the internal Coin code. I.e. do not use addChild(), removeChild(), insertChild() or replaceChild() from any callback that is triggered directly or indirectly from an action traversal. The most common way of getting hit by this error, would be something like the following (simplified) example:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoCone.h>
#include <Inventor/manips/SoPointLightManip.h>
#include <Inventor/events/SoMouseButtonEvent.h>
SoPointLightManip * global_pointlightmanip;
SoSeparator * global_root;
// Remove point light when clicking right mouse button.
static void
mySelectionC(void * ud, SoEventCallback * n)
{
if (global_pointlightmanip) {
global_root->removeChild(global_pointlightmanip);
global_pointlightmanip = NULL;
}
}
}
int
main(int argc, char ** argv)
{
QWidget * window = SoQt::init(argv[0]);
global_root = new SoSeparator;
global_root->ref();
ecb->addEventCallback(SoMouseButtonEvent::getClassTypeId(), mySelectionC, 0);
global_root->addChild(ecb);
global_root->addChild(new SoCone);
global_pointlightmanip = new SoPointLightManip;
global_root->addChild(global_pointlightmanip);
SoQtExaminerViewer * viewer = new SoQtExaminerViewer(window);
viewer->setSceneGraph(global_root);
viewer->show();
SoQt::show(window);
SoQt::mainLoop();
global_root->unref();
delete viewer;
return 0;
}

What happens in the above case is this: when clicking with the right mouse button, the SoQtExaminerViewer converts the Qt event to a Coin event, which is sent down the scene graph with an SoHandleEventAction. The action traversal reaches the "global_root" SoSeparator node, where it sees that it should further traverse 3 child nodes (first the SoEventCallback, then the SoCone, then the SoPointLightManip). When it then traverses the SoEventCallback, the mySelectionC() callback will be invoked, which removes the last child. But the SoHandleEventAction will still continue its traversal as if the global_root node has 3 children – and the code will crash.

(This exact example would perhaps be straight-forward to handle internally in Coin, but there are other ways to change the scene graph layout that are very difficult to handle properly. So in general, changing layout during action traversal is not allowed.)

What to do in these cases is to change the code inside the callback to not do any operations that immediately changes the layout of the scene graph, but to delay it for after the traversal is done. This can e.g. be done by using a Coin sensor.

FILE FORMAT/DEFAULTS:

Group {
}

Constructor & Destructor Documentation

◆ SoGroup() [1/2]

SoGroup::SoGroup ( void  )

Default constructor.

◆ SoGroup() [2/2]

SoGroup::SoGroup ( int  nchildren)

Constructor.

The argument should be the approximate number of children which is expected to be inserted below this node. The number need not be exact, as it is only used as a hint for better memory resource allocation.

◆ ~SoGroup()

SoGroup::~SoGroup ( )
protectedvirtual

Destructor.

Member Function Documentation

◆ getTypeId()

SoType SoGroup::getTypeId ( void  ) const
virtual

Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting.

Usage example:

void foo(SoNode * node)
{
if (node->getTypeId() == SoFile::getClassTypeId()) {
SoFile * filenode = (SoFile *)node; // safe downward cast, knows the type
}
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the predefined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the top level superclasses for the various class groups.

Implements SoBase.

Reimplemented in SoExtSelection, SoVRMLSwitch, SoSelection, SoWWWAnchor, SoVRMLAnchor, SoGeoSeparator, SoSwitch, SoVRMLBillboard, SoShadowGroup, SoVRMLCollision, SoVRMLGroup, SoVRMLLOD, SoLocateHighlight, SoSeparator, SoVRMLParent, SoBlinker, SoLOD, SoArray, SoLevelOfDetail, SoVRMLTransform, SoMultipleCopy, SoPathSwitch, SoAnnotation, and SoTransformSeparator.

◆ getFieldData()

const SoFieldData * SoGroup::getFieldData ( void  ) const
protectedvirtual

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

Reimplemented in SoExtSelection, SoVRMLSwitch, SoSelection, SoWWWAnchor, SoVRMLAnchor, SoGeoSeparator, SoSwitch, SoVRMLBillboard, SoShadowGroup, SoVRMLCollision, SoVRMLGroup, SoVRMLLOD, SoLocateHighlight, SoSeparator, SoVRMLParent, SoBlinker, SoLOD, SoArray, SoLevelOfDetail, SoVRMLTransform, SoMultipleCopy, SoPathSwitch, SoAnnotation, and SoTransformSeparator.

◆ addChild()

void SoGroup::addChild ( SoNode node)
virtual

Append a child node to the list of children nodes this group node is managing.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ insertChild()

void SoGroup::insertChild ( SoNode child,
int  newchildindex 
)
virtual

Insert a child node at position newchildindex.

newchildindex must be <= this->getNumChildren()

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ getChild()

SoNode * SoGroup::getChild ( int  index) const
virtual

Returns pointer to child node at index.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ findChild()

int SoGroup::findChild ( const SoNode node) const
virtual

Returns index in our list of children for child node, or -1 if node is not a child of this group node.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ getNumChildren()

int SoGroup::getNumChildren ( void  ) const
virtual

Returns number of child nodes managed by this group.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ removeChild() [1/2]

void SoGroup::removeChild ( int  childindex)
virtual

Remove node at childindex in our list of children.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ removeChild() [2/2]

void SoGroup::removeChild ( SoNode child)
virtual

Remove child from the set of children managed by this group node. Will decrease the reference count of child by 1.

This is a convenience method. It will simply call findChild() with child as argument, and then call removeChild(int) if the child is found.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ removeAllChildren()

void SoGroup::removeAllChildren ( void  )
virtual

Do not manage the children anymore. Will dereference all children by 1 as they are removed.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ replaceChild() [1/2]

void SoGroup::replaceChild ( int  index,
SoNode newchild 
)
virtual

Replace child at index with newChild.

Dereferences the child previously at index, and increases the reference count of newChild by 1.

index must be < this->getNumChildren()

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ replaceChild() [2/2]

void SoGroup::replaceChild ( SoNode oldchild,
SoNode newchild 
)
virtual

Replace oldchild with newchild.

Dereferences oldchild by 1, and increases the reference count of newchild by 1.

This is a convenience method. It will simply call findChild() with oldchild as argument, and call replaceChild(int, SoNode*) if the child is found.

Please note that this method is not virtual in the original SGI Inventor API.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ doAction()

void SoGroup::doAction ( SoAction action)
virtual

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLTransform, SoVRMLLOD, SoVRMLGroup, SoVRMLParent, SoArray, SoSeparator, SoSwitch, SoVRMLBillboard, SoLOD, SoLevelOfDetail, SoMultipleCopy, SoPathSwitch, and SoTransformSeparator.

◆ GLRender()

void SoGroup::GLRender ( SoGLRenderAction action)
virtual

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or want to throw geometry primitives at OpenGL override this method.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, SoVRMLGroup, SoArray, SoSeparator, SoSwitch, SoVRMLBillboard, SoLOD, SoVRMLCollision, SoLevelOfDetail, SoMultipleCopy, SoPathSwitch, SoTransformSeparator, and SoAnnotation.

◆ callback()

void SoGroup::callback ( SoCallbackAction action)
virtual

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLTransform, SoVRMLLOD, SoVRMLGroup, SoSeparator, SoArray, SoSwitch, SoVRMLBillboard, SoPathSwitch, SoGeoSeparator, SoLOD, SoLevelOfDetail, SoMultipleCopy, and SoTransformSeparator.

◆ getBoundingBox()

void SoGroup::getBoundingBox ( SoGetBoundingBoxAction action)
virtual

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculate their bounding box also override this method to change the relevant state variables.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, SoVRMLTransform, SoVRMLGroup, SoArray, SoSeparator, SoLOD, SoSwitch, SoVRMLBillboard, SoGeoSeparator, SoLevelOfDetail, SoMultipleCopy, SoPathSwitch, SoBlinker, and SoTransformSeparator.

◆ getMatrix()

void SoGroup::getMatrix ( SoGetMatrixAction action)
virtual

Action method for SoGetMatrixAction.

Updates action by accumulating with the transformation matrix of this node (if any).

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLTransform, SoVRMLGroup, SoArray, SoSeparator, SoSwitch, SoVRMLBillboard, SoGeoSeparator, SoMultipleCopy, SoPathSwitch, and SoTransformSeparator.

◆ handleEvent()

void SoGroup::handleEvent ( SoHandleEventAction action)
virtual

Action method for SoHandleEventAction.

Inspects the event data from action, and processes it if it is something which this node should react to.

Nodes influencing relevant state variables for how event handling is done also override this method.

Reimplemented from SoNode.

Reimplemented in SoExtSelection, SoSelection, SoVRMLSwitch, SoSeparator, SoArray, SoWWWAnchor, SoVRMLAnchor, SoLocateHighlight, SoSwitch, SoMultipleCopy, and SoPathSwitch.

◆ pick()

void SoGroup::pick ( SoPickAction action)
virtual

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoArray, SoVRMLBillboard, SoSwitch, SoMultipleCopy, SoPathSwitch, and SoTransformSeparator.

◆ search()

void SoGroup::search ( SoSearchAction action)
virtual

Action method for SoSearchAction.

Compares the search criteria from the action to see if this node is a match. Searching is done by matching up all criteria set up in the SoSearchAction – if any of the requested criteria is a miss, the search is not deemed successful for the node.

See also
SoSearchAction

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLGroup, SoVRMLLOD, SoSeparator, SoArray, SoVRMLParent, SoSwitch, SoVRMLBillboard, SoMultipleCopy, and SoPathSwitch.

◆ write()

void SoGroup::write ( SoWriteAction action)
virtual

Action method for SoWriteAction.

Writes out a node object, and any connected nodes, engines etc, if necessary.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLGroup, SoVRMLLOD, SoVRMLParent, SoSwitch, and SoBlinker.

◆ getPrimitiveCount()

void SoGroup::getPrimitiveCount ( SoGetPrimitiveCountAction action)
virtual

Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculate their primitive count also override this method to change the relevant state variables.

Reimplemented from SoNode.

Reimplemented in SoVRMLGroup, SoVRMLLOD, SoVRMLTransform, SoSeparator, SoArray, SoVRMLParent, SoSwitch, SoLOD, SoGeoSeparator, SoMultipleCopy, SoPathSwitch, and SoTransformSeparator.

◆ audioRender()

void SoGroup::audioRender ( SoAudioRenderAction action)
virtual

Action method for SoAudioRenderAction.

Does common processing for SoAudioRenderAction action instances.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLGroup, SoVRMLLOD, SoVRMLTransform, SoSeparator, SoArray, SoSwitch, SoLOD, SoMultipleCopy, SoPathSwitch, SoLevelOfDetail, and SoTransformSeparator.

◆ getChildren()

SoChildList * SoGroup::getChildren ( void  ) const
virtual

Returns list of children.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

◆ addWriteReference()

void SoGroup::addWriteReference ( SoOutput out,
SbBool  isfromfield = FALSE 
)
virtual

This method is used during the first write pass of a write action to count the number of references to this object in the scene graph.

Reimplemented from SoFieldContainer.

◆ readInstance()

SbBool SoGroup::readInstance ( SoInput in,
unsigned short  flags 
)
protectedvirtual

This method is mainly intended for internal use during file import operations.

It reads a definition of an instance from the input stream in. The input stream state points to the start of a serialized / persistent representation of an instance of this class type.

TRUE or FALSE is returned, depending on if the instantiation and configuration of the new object of this class type went OK or not. The import process should be robust and handle corrupted input streams by returning FALSE.

flags is used internally during binary import when reading user extension nodes, group nodes or engines.

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, SoSeparator, and SoVRMLParent.

◆ readChildren()

SbBool SoGroup::readChildren ( SoInput in)
protectedvirtual

Read all children of this node from in and attach them below this group in left-to-right order. Returns FALSE upon read error.

◆ copyContents()

void SoGroup::copyContents ( const SoFieldContainer from,
SbBool  copyconnections 
)
protectedvirtual

Makes a deep copy of all data of from into this instance, except external scene graph references if copyconnections is FALSE.

This is the method that should be overridden by extension node / engine / dragger / whatever subclasses which need to account for internal data that are not handled automatically.

For copying nodes from application code, you should not invoke this function directly, but rather call the SoNode::copy() function:

SoNode * mynewnode = templatenode->copy();

The same also goes for engines.

Make sure that when you override the copyContents() method in your extension class that you also make it call upwards to its parent superclass in the inheritance hierarchy, as copyContents() in for instance SoNode and SoFieldContainer does important work. It should go something like this:

void
MyCoinExtensionNode::copyContents(const SoFieldContainer * from,
SbBool copyconnections)
{
// let parent superclasses do their thing (copy fields, copy
// instance name, etc.)
SoNode::copyContents(from, copyconnections);
// [..then copy internal data..]
}

Reimplemented from SoNode.

Reimplemented in SoVRMLSwitch, SoVRMLLOD, and SoVRMLParent.

Member Data Documentation

◆ children

SoChildList * SoGroup::children
protected

List of managed child nodes.


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