---
name: "SoToVRML2Action"
section: "3"
platform: "linux"
package: "coin"
version: "1:4.0.10-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/SoToVRML2Action"
---

# SoToVRML2Action(3)

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

## 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 reuse nodes when possible.

VRML1 nodes will be converted to their equivalent VRML2 nodes, 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, standalone 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 object derived from a class inheriting **SoAction**. This is used for runtime type checking and "downward" casting.

Reimplemented from **SoToVRMLAction**.

### SoType SoToVRML2Action::getClassTypeId (void ) \[static\]

This static method returns the **SoType** object associated with objects of this class.

### 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 list of enabled elements.

Reimplemented from **SoToVRMLAction**.

### SoEnabledElementsList \* SoToVRML2Action::getClassEnabledElements (void ) \[static\], \[protected\]

Returns list of enabled elements for this class. The enabledElements and methods variables are protected in the original OIV API. This is not such a good idea, since exposed static class member variables is a major grievance with regard to Win32 DLLs. This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.\

### SoActionMethodList \* SoToVRML2Action::getClassActionMethods (void ) \[static\], \[protected\]

Returns list of action methods for this class. The enabledElements and methods variables are protected in the original OIV API. This is not such a good idea, since exposed static class member variables is a major grievance with regard to Win32 DLLs. This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.\

### void SoToVRML2Action::initClass (void ) \[static\]

Initializes the runtime type system for this class, and sets up the enabled elements and action method list.

### 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 scene graph 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 scene graph 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 scene graph traversal.

Reimplemented from **SoToVRMLAction**.

## Author

Generated automatically by Doxygen for Coin from the source code.