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SoToVRML2Action(3) Library Functions Manual SoToVRML2Action(3)

NAME

SoToVRML2Action - The SoToVRML2Action class builds a new scene graph, using only VRML97/VRML2 nodes.

SYNOPSIS

#include <Inventor/actions/SoToVRML2Action.h>

Inherits SoToVRMLAction.

Public Member Functions


virtual SoType getTypeId (void) const
SoToVRML2Action (void)
virtual ~SoToVRML2Action (void)
virtual void apply (SoNode *node)
virtual void apply (SoPath *path)
virtual void apply (const SoPathList &pathlist, SbBool obeysrules=FALSE)
class SoVRMLGroup * getVRML2SceneGraph (void) const
void reuseAppearanceNodes (SbBool appearance)
SbBool doReuseAppearanceNodes (void) const
void reusePropertyNodes (SbBool property)
SbBool doReusePropertyNodes (void) const
void reuseGeometryNodes (SbBool geometry)
SbBool doReuseGeometryNodes (void) const

Public Member Functions inherited from SoToVRMLAction
SoToVRMLAction (void)
virtual ~SoToVRMLAction (void)
SoNode * getVRMLSceneGraph (void) const
void expandSoFile (SbBool flag)
SbBool areSoFileExpanded (void) const
void setUrlName (const SbString name)
SbString getUrlName (void) const
void writeTexCoords (SbBool flag)
SbBool areTexCoordWritten (void) const
void expandTexture2Node (SbBool flag)
SbBool areTexture2NodeExpanded (void) const
void keepUnknownNodes (SbBool flag)
SbBool areUnknownNodeKept (void) const
void convertInlineNodes (SbBool flag)
SbBool doConvertInlineNodes (void) const
void conditionalConversion (SbBool flag)
SbBool doConditionalConversion (void) const
void setVerbosity (SbBool flag)
SbBool isVerbose (void) const

Public Member Functions inherited from SoAction
virtual ~SoAction (void)
virtual SbBool isOfType (SoType type) const
void apply (SoAction *beingApplied)
virtual void invalidateState (void)
AppliedCode getWhatAppliedTo (void) const
SoNode * getNodeAppliedTo (void) const
SoPath * getPathAppliedTo (void) const
const SoPathList * getPathListAppliedTo (void) const
const SoPathList * getOriginalPathListAppliedTo (void) const
SbBool isLastPathListAppliedTo (void) const
PathCode getPathCode (int &numindices, const int *&indices)
void traverse (SoNode *const node)
SbBool hasTerminated (void) const
const SoPath * getCurPath (void)
SoState * getState (void) const
PathCode getCurPathCode (void) const
virtual SoNode * getCurPathTail (void)
void usePathCode (int &numindices, const int *&indices)
void pushCurPath (const int childindex, SoNode *node=NULL)
void popCurPath (const PathCode prevpathcode)
void pushCurPath (void)
void popPushCurPath (const int childindex, SoNode *node=NULL)
void popCurPath (void)
void switchToPathTraversal (SoPath *path)
void switchToNodeTraversal (SoNode *node)

Static Public Member Functions


static SoType getClassTypeId (void)
static void addMethod (const SoType type, SoActionMethod method)
static void enableElement (const SoType type, const int stackindex)
static void initClass (void)

Static Public Member Functions inherited from SoToVRMLAction
static SoType getClassTypeId (void)
static void addMethod (const SoType type, SoActionMethod method)
static void enableElement (const SoType type, const int stackindex)
static void initClass (void)

Static Public Member Functions inherited from SoAction
static void initClass (void)
static void initClasses (void)
static SoType getClassTypeId (void)
static void nullAction (SoAction *action, SoNode *node)

Protected Member Functions


virtual const SoEnabledElementsList & getEnabledElements (void) const
virtual void beginTraversal (SoNode *node)

Protected Member Functions inherited from SoAction
SoAction (void)
virtual void endTraversal (SoNode *node)
void setTerminated (const SbBool flag)
virtual SbBool shouldCompactPathList (void) const

Static Protected Member Functions


static SoEnabledElementsList * getClassEnabledElements (void)
static SoActionMethodList * getClassActionMethods (void)

Static Protected Member Functions inherited from SoToVRMLAction
static SoEnabledElementsList * getClassEnabledElements (void)
static SoActionMethodList * getClassActionMethods (void)

Static Protected Member Functions inherited from SoAction
static SoEnabledElementsList * getClassEnabledElements (void)
static SoActionMethodList * getClassActionMethods (void)

Additional Inherited Members

Public Types inherited from SoAction
enum AppliedCode { NODE = 0, PATH = 1, PATH_LIST = 2 }
enum PathCode { NO_PATH = 0, IN_PATH = 1, BELOW_PATH = 2, OFF_PATH = 3 }

Protected Attributes inherited from SoAction
SoState * state
SoActionMethodList * traversalMethods

Detailed Description

The SoToVRML2Action class builds a new scene graph, using only VRML97/VRML2 nodes.

This action is used for converting a scene graph of VRML1/Coin nodes to a new scene graph using only VRML97/VRML2 nodes.

Due to the basic differences between VRML1/Coin and VRML2 (the latter does not really have a traversal state) the new scene graph will typically be somewhat larger. To minimize this effect the action tries to re-use nodes when possible.

VRML1 nodes will be converted to its direct equivalent VRML2 node, while Coin nodes with no VRML2 equivalent are converted to IndexedFaceSet. If the DrawStyle is POINTS, all geometry will be built using PointSet; if it is LINES IndexedLineSet is used.

Here's a basic usage example of this action, in the form of a complete, stand-alone program:

#include <Inventor/SoDB.h>
#include <Inventor/SoInteraction.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoOutput.h>
#include <Inventor/actions/SoWriteAction.h>
#include <Inventor/actions/SoToVRML2Action.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/VRMLnodes/SoVRMLGroup.h>
int
main(int argc, char *argv[])
{


  SoDB::init();


  SoInteraction::init();


  SoInput in;


  in.openFile(argv[1]);


  printf("Reading...\n");


  SoSeparator *root = SoDB::readAll(&in);


  if (root) {


    root->ref();


    SbString hdr = in.getHeader();


    in.closeFile();


    printf("Converting...\n");


    SoToVRML2Action tovrml2;


    tovrml2.apply(root);


    SoVRMLGroup *newroot = tovrml2.getVRML2SceneGraph();


    newroot->ref();


    root->unref();


    printf("Writing...\n");


    SoOutput out;


    out.openFile("out.wrl");


    out.setHeaderString("#VRML V2.0 utf8");


    SoWriteAction wra(&out);


    wra.apply(newroot);


    out.closeFile();


    newroot->unref();


  }


  return 0;
}

Note: if VRML97 support is not present in the Coin library, this action does nothing and getVRML2SceneGraph always returns NULL.

See also

SoToVRMLAction

Since

Coin 2.0

TGS Inventor 2.5

Constructor & Destructor Documentation

SoToVRML2Action::SoToVRML2Action (void )

Constructor.

SoToVRML2Action::~SoToVRML2Action (void ) [virtual]

The destructor.

Member Function Documentation

SoType SoToVRML2Action::getTypeId (void ) const [virtual]

Returns the type identification of an action derived from a class inheriting SoAction. This is used for run-time type checking and "downward" casting.

Usage example:

void bar(SoAction * action)
{


  if (action->getTypeId() == SoGLRenderAction::getClassTypeId()) {


    // safe downward cast, know the type


    SoGLRenderAction * glrender = (SoGLRenderAction *)action;


  }


  return; // ignore if not renderaction
}

For application programmers wanting to extend the library with new actions: 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 pre-defined macros available through Inventor/nodes/SoSubAction.h: SO_ACTION_SOURCE, SO_ACTION_INIT_CLASS and SO_ACTION_CONSTRUCTOR.

For more information on writing Coin extensions, see the SoAction class documentation.

Returns the actual type id of an object derived from a class inheriting SoAction. Needs to be overridden in all subclasses.

Reimplemented from SoToVRMLAction.

void SoToVRML2Action::addMethod (const SoType type, SoActionMethod method) [static]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoToVRML2Action::enableElement (const SoType type, const int stackindex) [static]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

const SoEnabledElementsList & SoToVRML2Action::getEnabledElements (void ) const [protected], [virtual]

Returns a list of the elements used by action instances of this class upon traversal operations.

Reimplemented from SoToVRMLAction.

void SoToVRML2Action::apply (SoNode * root) [virtual]

Applies the action to the scene graph rooted at root.

Note that you should not apply an action to a node with a zero reference count. The behavior in that case is undefined.

Reimplemented from SoToVRMLAction.

void SoToVRML2Action::apply (SoPath * path) [virtual]

Applies the action to the parts of the graph defined by path.

Note that an SoPath will also contain all nodes that may influence e.g. geometry nodes in the path. So for instance applying an SoGLRenderAction on an SoPath will render that path as expected in the view, where geometry will get its materials, textures, and other appearance settings correctly.

If the path ends in an SoGroup node, the action will also traverse the tail node's children.

Reimplemented from SoToVRMLAction.

void SoToVRML2Action::apply (const SoPathList & pathlist, SbBool obeysrules = FALSE) [virtual]

Applies action to the graphs defined by pathlist. If obeysrules is set to TRUE, pathlist must obey the following four conditions (which is the case for path lists returned from search actions for non-group nodes and path lists returned from picking actions):

All paths must start at the same head node. All paths must be sorted in traversal order. The paths must be unique. No path can continue through the end point of another path.

See also

SoAction::apply(SoPath * path)

Reimplemented from SoToVRMLAction.

SoVRMLGroup * SoToVRML2Action::getVRML2SceneGraph (void ) const

Return a pointer to the root node of the generated scenegraph of only VRML2 / VRML97 nodes.

Will return NULL if VRML97 support was not compiled into the library.

void SoToVRML2Action::reuseAppearanceNodes (SbBool appearance)

Set the flag deciding if appearance nodes should be reused if possible. The default is FALSE.

Please note that support for reusing Appearance nodes is not implemented yet.

SbBool SoToVRML2Action::doReuseAppearanceNodes (void ) const

Get the flag deciding if appearance nodes should be reused if possible. The default is FALSE.

Please note that support for reusing Appearance nodes is not implemented yet, so this method will always return FALSE.

void SoToVRML2Action::reusePropertyNodes (SbBool property)

Set the flag deciding if property nodes should be reused if possible. The default is FALSE.

SbBool SoToVRML2Action::doReusePropertyNodes (void ) const

Get the flag deciding if property nodes should be reused if possible. The default is FALSE.

void SoToVRML2Action::reuseGeometryNodes (SbBool geometry)

Set the flag deciding if geometry nodes should be reused if possible. The default is FALSE.

Please note that support for reusing Geometry nodes is not implemented yet.

SbBool SoToVRML2Action::doReuseGeometryNodes (void ) const

Get the flag deciding if geometry nodes should be reused if possible. The default is FALSE.

Please note that support for reusing Geometry nodes is not implemented yet, so this function will always return FALSE.

void SoToVRML2Action::beginTraversal (SoNode * node) [protected], [virtual]

This virtual method is called from SoAction::apply(), and is the entry point for the actual scenegraph traversal.

It can be overridden to initialize the action at traversal start, for specific initializations in the action subclasses inheriting SoAction.

Default method just calls traverse(), which any overridden implementation of the method must do too (or call SoAction::beginTraversal()) to trigger the scenegraph traversal.

Reimplemented from SoToVRMLAction.

Author

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