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SoGetMatrixAction Class Reference

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

#include <Inventor/actions/SoGetMatrixAction.h>

Inheritance diagram for SoGetMatrixAction:

Public Member Functions

virtual SoType getTypeId (void) const
 SoGetMatrixAction (const SbViewportRegion &region)
virtual ~SoGetMatrixAction (void)
void setViewportRegion (const SbViewportRegion &region)
const SbViewportRegiongetViewportRegion (void) const
SbMatrixgetMatrix (void)
SbMatrixgetInverse (void)
SbMatrixgetTextureMatrix (void)
SbMatrixgetTextureInverse (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
SoNodegetNodeAppliedTo (void) const
SoPathgetPathAppliedTo (void) const
const SoPathListgetPathListAppliedTo (void) const
const SoPathListgetOriginalPathListAppliedTo (void) const
SbBool isLastPathListAppliedTo (void) const
PathCode getPathCode (int &numindices, const int *&indices)
void traverse (SoNode *const node)
SbBool hasTerminated (void) const
const SoPathgetCurPath (void)
SoStategetState (void) const
PathCode getCurPathCode (void) const
virtual SoNodegetCurPathTail (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 SoEnabledElementsListgetEnabledElements (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 SoEnabledElementsListgetClassEnabledElements (void)
static SoActionMethodListgetClassActionMethods (void)
- Static Protected Member Functions inherited from SoAction
static SoEnabledElementsListgetClassEnabledElements (void)
static SoActionMethodListgetClassActionMethods (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

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;
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);
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::SoGetMatrixAction ( const SbViewportRegion region)


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

◆ ~SoGetMatrixAction()

SoGetMatrixAction::~SoGetMatrixAction ( void  )


Member Function Documentation

◆ getTypeId()

SoType SoGetMatrixAction::getTypeId ( void  ) const

Returns the type identification of an action derived from a class inheriting SoAction. This is used for runtime 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 render action

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 predefined 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.

Implements SoAction.

◆ addMethod()

void SoGetMatrixAction::addMethod ( const SoType  type,
SoActionMethod  method 

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

◆ enableElement()

void SoGetMatrixAction::enableElement ( const SoType  type,
const int  stackindex 

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

◆ getEnabledElements()

const SoEnabledElementsList & SoGetMatrixAction::getEnabledElements ( void  ) const

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

Reimplemented from SoAction.

◆ setViewportRegion()

void SoGetMatrixAction::setViewportRegion ( const SbViewportRegion region)

Set the viewport region.

See also

◆ getViewportRegion()

const SbViewportRegion & SoGetMatrixAction::getViewportRegion ( void  ) const

Returns the viewport region for the action instance.

◆ getMatrix()

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.

◆ getInverse()

SbMatrix & SoGetMatrixAction::getInverse ( void  )

Returns the inverse of the accumulated transformation matrix.

◆ getTextureMatrix()

SbMatrix & SoGetMatrixAction::getTextureMatrix ( void  )

Returns the accumulated texture matrix.

◆ getTextureInverse()

SbMatrix & SoGetMatrixAction::getTextureInverse ( void  )

Returns the inverse of the accumulated texture matrix.

◆ beginTraversal()

void SoGetMatrixAction::beginTraversal ( SoNode node)

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.

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