NAME¶

SoGetMatrixAction — computes transformation matrix for subgraph

INHERITS FROM¶

SoAction > SoGetMatrixAction

SYNOPSIS¶

#include <Inventor/actions/SoGetMatrixAction.h>
Methods from class SoGetMatrixAction:

SoGetMatrixAction(const SbViewportRegion &newRegion)
void setViewportRegion(const SbViewportRegion &newRegion)
const SbViewportRegion & getViewportRegion() const
SbMatrix & getMatrix()
SbMatrix & getInverse()
SbMatrix & getTextureMatrix()
SbMatrix & getTextureInverse()
Methods from class SoAction:

virtual void apply(SoNode *node)
virtual void apply(SoPath *path)
virtual void apply(const SoPathList &pathList, SbBool obeysRules = FALSE)
static SoType getClassTypeId()
virtual SoType getTypeId()
virtual SbBool isOfType(SoType type)
virtual void invalidateState()

DESCRIPTION¶

This action computes transformation matrices for a given subgraph. It computes the cumulative transformation matrix and its inverse, along with a cumulative texture transformation matrix and its inverse. This action is unlike most others in that it does not traverse downwards from groups. When applied to a node, it computes the matrix for just that node. (This makes sense for transformation nodes, but not for others, really.) It is much more useful when applied to a path. When applied to a path, it gathers the transformation info for all nodes in the path and those that affect nodes in the path, but it stops when it hits the last node in the path; it does not traverse downwards from it as other actions (such as rendering) do. This behavior makes the most sense for this action.

METHODS¶

SoGetMatrixAction(const SbViewportRegion &newRegion)
Constructor takes viewport region to use for picking. Even though the matrix computation may not involve a window per se, some nodes need this information to determine their placement.

void setViewportRegion(const SbViewportRegion &newRegion)
const SbViewportRegion & getViewportRegion() const
Sets/returns current viewport region to use for action.

SbMatrix & getMatrix()
SbMatrix & getInverse()
Returns cumulative transformation matrix and its inverse. Warning: the matrices returned by these routines should not be changed (unless you are implementing your own transformation nodes).

SbMatrix & getTextureMatrix()
SbMatrix & getTextureInverse()
Returns cumulative texture transformation matrix and its inverse. Warning: the matrices returned by these routines should not be changed (unless you are implementing your own transformation nodes).

SEE ALSO¶

SoGetBoundingBoxAction