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							SoGetMatrixAction(3IV)

NAME
     SoGetMatrixAction (SoMxAct) - computes transformation matrix for subgraph

INHERITS FROM
     SoAction > SoGetMatrixAction

SYNOPSIS
     #include <Inventor_c/actions/SoGetMatrixAction.h>

     typedef SoGetMatrixAction	SoMxAct

	  Functions from class SoGetMatrixAction:

     SoGetMatrixAction *       SoMxActCreate(const SbViewportRegion
				    *newRegion)
     void		       SoMxActSetVPReg(SoMxAct *this, const
				    SbViewportRegion *newRegion)
     const SbViewportRegion *  SoMxActGetVPReg(const SoMxAct *this)
     SbMatrix *		       SoMxActGetMx(SoMxAct *this)
     SbMatrix *		       SoMxActGetInv(SoMxAct *this)
     SbMatrix *		       SoMxActGetTexMx(SoMxAct *this)
     SbMatrix *		       SoMxActGetTexInv(SoMxAct *this)

	  Functions from class SoAction:

     void		 SoMxActApply(SoMxAct *this, SoNode *node)
     void		 SoMxActApplyPath(SoMxAct *this, SoPath *path)
     void		 SoMxActApplyPathList(SoMxAct *this, const SoPathList
			      *pathList, SbBool obeysRules = FALSE)
     SoType		 SoMxActGetClassTypeId()
     SoType		 SoMxActGetTypeId(SoMxAct *this)
     SbBool		 SoMxActIsOfType(SoMxAct *this, SoType type)
     void		 SoMxActInvalidateState(SoMxAct *this)

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.

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SoGetMatrixAction(3IV)

FUNCTIONS
     SoGetMatrixAction *       SoMxActCreate(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		       SoMxActSetVPReg(SoMxAct *this, const
				    SbViewportRegion *newRegion)
     const SbViewportRegion *  SoMxActGetVPReg(const SoMxAct *this)
	  Sets/returns current viewport region to use for action.

     SbMatrix *		       SoMxActGetMx(SoMxAct *this)
     SbMatrix *		       SoMxActGetInv(SoMxAct *this)
	  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 *		       SoMxActGetTexMx(SoMxAct *this)
     SbMatrix *		       SoMxActGetTexInv(SoMxAct *this)
	  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

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