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SoGLViewingMatrixElement

NAME

SoGLViewingMatrixElement -

The SoGLViewingMatrixElement class is used to store the current viewing matrix.

The viewing matrix contains the inverse camera coordinate system matrix. The camera coordinate system is built from the field values in the current SoCamera (currently either SoPerspectiveCamera or SoOrthographicCamera) and any transformations prior to the camera in the scene graph.

SYNOPSIS

#include <Inventor/elements/SoGLViewingMatrixElement.h>

Inherits SoViewingMatrixElement.

Public Member Functions

virtual void init (SoState *state)
FIXME: write doc.
virtual void push (SoState *state)

virtual void pop (SoState *state, const SoElement *prevTopElement)

Static Public Member Functions

static void initClass (void)

static uint32_t getNodeId (SoState *const state)

static SbMatrix getResetMatrix (SoState *state)

Protected Member Functions

virtual ~SoGLViewingMatrixElement ()

virtual void setElt (const SbMatrix &matrix)

Detailed Description

The SoGLViewingMatrixElement class is used to store the current viewing matrix.

The viewing matrix contains the inverse camera coordinate system matrix. The camera coordinate system is built from the field values in the current SoCamera (currently either SoPerspectiveCamera or SoOrthographicCamera) and any transformations prior to the camera in the scene graph.

Constructor & Destructor Documentation

SoGLViewingMatrixElement::~SoGLViewingMatrixElement (void) [protected, virtual]The destructor.

Member Function Documentation

void SoGLViewingMatrixElement::initClass (void) [static]This static method initializes static data for the SoViewingMatrixElement class.

Reimplemented from SoViewingMatrixElement.

uint32_t SoGLViewingMatrixElement::getNodeId (SoState *const state) [static]Returns the node id of the current camera node. This is used by SoGLModelMatrixElement to detect a change in the viewing matrix inside an SoTransformSeparator node.

SbMatrix SoGLViewingMatrixElement::getResetMatrix (SoState * state) [static]Returns the matrix that should be used by SoGLModelMatrixElement when the transformation should be reset during traversal (typically when encountering an SoResetTransform node). It is not sufficient to simply load the viewing matrix, since the transformations that were applied before the camera needs to be accounted for.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:

Coin 2.0

void SoGLViewingMatrixElement::setElt (const SbMatrix & matrix) [protected, virtual]Sets the current viewing matrix.

Reimplemented from SoViewingMatrixElement.

Author

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