SoGLViewingMatrixElement - Online Linux Manual PageSection : 3
Updated : Mon Jan 25 2021
Source : Version 4.0.0
Note : Coin

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

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SYNOPSIS
#include <Inventor/elements/SoGLViewingMatrixElement​.h> Inherits SoViewingMatrixElement​.

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Public Member Functionsvirtual void init (SoState *state)
FIXME: write doc​. virtual void push (SoState *state)
virtual void pop (SoState *state, const SoElement *prevTopElement)

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Static Public Member Functionsstatic SoType getClassTypeId (void)
static int getClassStackIndex (void)
static void * createInstance (void)
static void initClass (void)
static SbUniqueId getNodeId (SoState *const state)
static SbMatrix getResetMatrix (SoState *state)

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Protected Member Functionsvirtual ~SoGLViewingMatrixElement ()
virtual void setElt (const SbMatrix &matrix)

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Additional Inherited Members

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Detailed DescriptionThe 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​.

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Constructor & Destructor Documentation

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

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Member Function Documentation

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void * SoGLViewingMatrixElement::createInstance (void) [static]This API member is considered internal to the library, as it is not likely to be of interest to the application programmer​.

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void SoGLViewingMatrixElement::push (SoState * state) [virtual]This method is called every time a new element is required in one of the stacks​. This happens when a writable element is requested, using SoState::getElement() or indirectly SoElement::getElement(), and the depth of the current element is less than the state depth​. Override this method if your element needs to copy data from the previous top of stack​. The push() method is called on the new element, and the previous element can be found using SoElement::getNextInStack()​. Reimplemented from SoElement​.

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void SoGLViewingMatrixElement::pop (SoState * state, const SoElement * prevTopElement) [virtual]This method is callled when the state is popped, and the depth of the element is bigger than the current state depth​. pop() is called on the new top of stack, and a pointer to the previous top of stack is passed in prevTopElement​. Override this method if you need to copy some state information from the previous top of stack​. Reimplemented from SoElement​.

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SbUniqueId 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​.

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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

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

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AuthorGenerated automatically by Doxygen for Coin from the source code​. 0

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Johanes Gumabo

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