---
name: "SoGetMatrixAction"
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/SoGetMatrixAction"
---

# SoGetMatrixAction(3)

The SoGetMatrixAction class is an action for accumulating the transformation matrix of a subgraph.

## NAME

SoGetMatrixAction - The **SoGetMatrixAction** class is an action for accumulating the transformation matrix of a subgraph.

## SYNOPSIS

\#include \<Inventor/actions/SoGetMatrixAction.h\>

Inherits **SoAction**.

### Public Member Functions

virtual **SoType** **getTypeId** (void) const\
 **SoGetMatrixAction** (const **SbViewportRegion** &region)\
 virtual **~SoGetMatrixAction** (void)\
 void **setViewportRegion** (const **SbViewportRegion** &region)\
 const **SbViewportRegion** & **getViewportRegion** (void) const\
 **SbMatrix** & **getMatrix** (void)\
 **SbMatrix** & **getInverse** (void)\
 **SbMatrix** & **getTextureMatrix** (void)\
 **SbMatrix** & **getTextureInverse** (void)\

Public Member Functions inherited from **SoAction** virtual **~SoAction** (void)\
 virtual SbBool **isOfType** (**SoType** type) const\
 virtual void **apply** (**SoNode** \*root)\
 virtual void **apply** (**SoPath** \*path)\
 virtual void **apply** (const **SoPathList** &pathlist, SbBool obeysrules=FALSE)\
 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 **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 **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 **SoGetMatrixAction** class is an action for accumulating the transformation matrix of a subgraph.

This action makes it easy to calculate and convert to and from the global coordinate system of your scene and local coordinates of parts in a hierarchical model.

As opposed to most other action types, the **SoGetMatrixAction** does not traverse children of the node it is applied to -- just the node itself. When applied to paths, it stops at the last node and does not continue further with the children of the tail node.

Typical usage when querying for world space position, orientation and/or scaling would be as follows:

```
// First get hold of an SoPath through the scene graph down to the
// node ("mynode") you want to query about its current world space
// transformation(s).
SoSearchAction * searchaction = new SoSearchAction;
searchaction->setNode(mynode);
searchaction->apply(myscenegraphroot);
SoPath * path = searchaction->getPath();
assert(path != NULL);
// Then apply the SoGetMatrixAction to get the full transformation
// matrix from world space.
const SbViewportRegion vpr = myviewer->getViewportRegion();
SoGetMatrixAction * getmatrixaction = new SoGetMatrixAction(vpr);
getmatrixaction->apply(path);
SbMatrix transformation = getmatrixaction->getMatrix();
// And if you want to access the individual transformation
// components of the matrix:
SbVec3f translation;
SbRotation rotation;
SbVec3f scalevector;
SbRotation scaleorientation;
transformation.getTransform(translation, rotation, scalevector, scaleorientation);
```

## Constructor & Destructor Documentation

### SoGetMatrixAction::SoGetMatrixAction (const SbViewportRegion & region)

Constructor.

The *region* viewport specification is not used by this action, and is passed along in case it is needed by any nodes.

### SoGetMatrixAction::~SoGetMatrixAction (void ) \[virtual\]

Destructor.

## Member Function Documentation

### SoType SoGetMatrixAction::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.

Implements **SoAction**.

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

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

### void SoGetMatrixAction::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 SoGetMatrixAction::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 & SoGetMatrixAction::getEnabledElements (void ) const \[protected\], \[virtual\]

Returns list of enabled elements.

Reimplemented from **SoAction**.

### SoEnabledElementsList \* SoGetMatrixAction::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 \* SoGetMatrixAction::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 SoGetMatrixAction::setViewportRegion (const SbViewportRegion & region)

Set the viewport *region*.

**See also**

**SoGetMatrixAction::SoGetMatrixAction()**

### const SbViewportRegion & SoGetMatrixAction::getViewportRegion (void ) const

Returns the viewport region for the action instance.

### SbMatrix & SoGetMatrixAction::getMatrix (void )

Returns the accumulated transformation matrix.

Note: don't modify the returned matrix. This should only be done if you are implementing your own transformation type node extensions. This advice is also valid for the other matrix access methods documented below.

### SbMatrix & SoGetMatrixAction::getInverse (void )

Returns the inverse of the accumulated transformation matrix.

### SbMatrix & SoGetMatrixAction::getTextureMatrix (void )

Returns the accumulated texture matrix.

### SbMatrix & SoGetMatrixAction::getTextureInverse (void )

Returns the inverse of the accumulated texture matrix.

### void SoGetMatrixAction::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 **SoAction**.

## Author

Generated automatically by Doxygen for Coin from the source code.