SoGetMatrixAction

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()

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.

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.

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 & 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).