SoTransform Class Reference
[Node Classes]

The SoTransform class is the "all-purpose" transformation node type.Like SoMatrixTransform, nodes of this type gives the application programmer maximum flexibility when specifying geometry transformations in a scene graph. If you want to set and keep the various components of the transformation matrix in separate entities, this node type is preferable, though. More...

#include <Inventor/nodes/SoTransform.h>

Inheritance diagram for SoTransform:

List of all members.

Public Member Functions
	SoTransform (void)
void	pointAt (const SbVec3f &frompoint, const SbVec3f &topoint)
void	getScaleSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const
void	getRotationSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const
void	getTranslationSpaceMatrix (SbMatrix &mat, SbMatrix &inv) const
void	multLeft (const SbMatrix &mat)
void	multRight (const SbMatrix &mat)
void	combineLeft (SoTransformation *nodeonright)
void	combineRight (SoTransformation *nodeonleft)
void	setMatrix (const SbMatrix &mat)
void	recenter (const SbVec3f &newcenter)
virtual void	doAction (SoAction *action)
virtual void	GLRender (SoGLRenderAction *action)
virtual void	callback (SoCallbackAction *action)
virtual void	getBoundingBox (SoGetBoundingBoxAction *action)
virtual void	getMatrix (SoGetMatrixAction *action)
virtual void	pick (SoPickAction *action)
virtual void	getPrimitiveCount (SoGetPrimitiveCountAction *action)
Static Public Member Functions
static void	initClass (void)
	Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
Public Attributes
SoSFVec3f	translation
SoSFRotation	rotation
SoSFVec3f	scaleFactor
SoSFRotation	scaleOrientation
SoSFVec3f	center
Protected Member Functions
virtual	~SoTransform ()

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Detailed Description

The SoTransform class is the "all-purpose" transformation node type.

Like SoMatrixTransform, nodes of this type gives the application programmer maximum flexibility when specifying geometry transformations in a scene graph. If you want to set and keep the various components of the transformation matrix in separate entities, this node type is preferable, though.

The order of operations is: first scaling is done, then rotation, then translation.

FILE FORMAT/DEFAULTS:

    Transform {
        translation 0 0 0
        rotation 0 0 1  0
        scaleFactor 1 1 1
        scaleOrientation 0 0 1  0
        center 0 0 0
    }

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Constructor & Destructor Documentation

SoTransform::SoTransform

(

void

)

Constructor.

SoTransform::~SoTransform

(

)

[protected, virtual]

Destructor.

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Member Function Documentation

void SoTransform::pointAt	(	const SbVec3f &	frompoint,
		const SbVec3f &	topoint
	)

Sets the transformation to translate to frompoint, with a rotation so that the (0,0,-1) vector is rotated into the vector from frompoint to topoint.

void SoTransform::getScaleSpaceMatrix	(	SbMatrix &	mat,
		SbMatrix &	inv
	)			const

Calculates the matrices to/from scale space.

void SoTransform::getRotationSpaceMatrix	(	SbMatrix &	mat,
		SbMatrix &	inv
	)			const

Calculates the matrices to/from rotation space.

void SoTransform::getTranslationSpaceMatrix	(	SbMatrix &	mat,
		SbMatrix &	inv
	)			const

Calculates the matrices to/from translation space.

void SoTransform::multLeft

(

const SbMatrix &

mat

)

Premultiplies this transformation by mat.

void SoTransform::multRight

(

const SbMatrix &

mat

)

Postmultiplies this transformation by mat.

void SoTransform::combineLeft

(

SoTransformation *

nodeonright

)

Premultiplies this transformation by the transformation in nodeonright.

void SoTransform::combineRight

(

SoTransformation *

nodeonleft

)

Postmultiplies this transformation by the transformation in nodeonleft.

void SoTransform::setMatrix

(

const SbMatrix &

mat

)

Sets the fields to create a transformation equal to mat.

void SoTransform::recenter

(

const SbVec3f &

newcenter

)

Sets the center field to newcenter. This might affect one or more of the other fields.

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Member Data Documentation

SoSFVec3f SoTransform::translation

The translation part of the transformation.

SoSFRotation SoTransform::rotation

The rotation part of the transformation.

Note that there is one very common mistake that is easy to make when setting the value of a an SoSFRotation field, and that is to inadvertently use the wrong SbRotation constructor. This example should clarify the problem:

  mytransformnode->rotation.setValue(0, 0, 1, 1.5707963f);

The programmer clearly tries to set a PI/2 rotation around the Z axis, but this will fail, as the SbRotation constructor invoked above is the one that takes as arguments the 4 floats of a quaternion. What the programmer almost certainly wanted to do was to use the SbRotation constructor that takes a rotation vector and a rotation angle, which is invoked like this:

  mytransformnode->rotation.setValue(SbVec3f(0, 0, 1), 1.5707963f);

SoSFVec3f SoTransform::scaleFactor

The scaling part of the transformation.

SoSFRotation SoTransform::scaleOrientation

The orientation the object is set to before scaling.

SoSFVec3f SoTransform::center

The center point for the rotation.

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The documentation for this class was generated from the following files:

• SoTransform.h
• SoTransform.cpp