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SoTransform.3coin2

NAME

SoTransform -

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.

SYNOPSIS

#include <Inventor/nodes/SoTransform.h>

Inherits SoTransformation.

Inherited by SoTransformManip.

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)

Public Attributes

SoSFVec3f translation

SoSFRotation rotation

SoSFVec3f scaleFactor

SoSFRotation scaleOrientation

SoSFVec3f center

Protected Member Functions

virtual ~SoTransform ()

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
     }
 
 

 

Constructor & Destructor Documentation

SoTransform::SoTransform (void)Constructor.

References center, rotation, scaleFactor, scaleOrientation, and translation.

SoTransform::~SoTransform () [protected, virtual]Destructor.

Member Function Documentation

void SoTransform::initClass (void) [static]Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

Reimplemented from SoTransformation.

Reimplemented in SoCenterballManip, SoHandleBoxManip, SoJackManip, SoTabBoxManip, SoTrackballManip, SoTransformBoxManip, SoTransformManip, and SoTransformerManip.

References SoNode::VRML1.

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.

References center, SbVec3f::normalize(), SoDebugError::postWarning(), rotation, scaleFactor, scaleOrientation, and translation.

void SoTransform::getScaleSpaceMatrix (SbMatrix & mat, SbMatrix & inv) constCalculates the matrices to/from scale space.

References center, SbMatrix::inverse(), SbRotation::inverse(), SbMatrix::multRight(), scaleFactor, scaleOrientation, SbMatrix::setRotate(), SbMatrix::setScale(), and SbMatrix::setTranslate().

void SoTransform::getRotationSpaceMatrix (SbMatrix & mat, SbMatrix & inv) constCalculates the matrices to/from rotation space.

References center, SbMatrix::inverse(), SbRotation::inverse(), SbMatrix::multRight(), rotation, scaleFactor, scaleOrientation, SbMatrix::setRotate(), SbMatrix::setScale(), and SbMatrix::setTranslate().

void SoTransform::getTranslationSpaceMatrix (SbMatrix & mat, SbMatrix & inv) constCalculates the matrices to/from translation space.

References center, SbMatrix::inverse(), SbRotation::inverse(), SbMatrix::multRight(), rotation, scaleFactor, scaleOrientation, SbMatrix::setRotate(), SbMatrix::setScale(), SbMatrix::setTranslate(), and translation.

void SoTransform::multLeft (const SbMatrix & mat)Premultiplies this transformation by mat.

References center, SbMatrix::multLeft(), rotation, scaleFactor, scaleOrientation, setMatrix(), SbMatrix::setTransform(), and translation.

Referenced by combineLeft().

void SoTransform::multRight (const SbMatrix & mat)Postmultiplies this transformation by mat.

References center, SbMatrix::multRight(), rotation, scaleFactor, scaleOrientation, setMatrix(), SbMatrix::setTransform(), and translation.

Referenced by combineRight().

void SoTransform::combineLeft (SoTransformation * nodeonright)Premultiplies this transformation by the transformation in nodeonright.

References SoAction::apply(), SoGetMatrixAction::getMatrix(), and multLeft().

void SoTransform::combineRight (SoTransformation * nodeonleft)Postmultiplies this transformation by the transformation in nodeonleft.

References SoAction::apply(), SoGetMatrixAction::getMatrix(), and multRight().

void SoTransform::setMatrix (const SbMatrix & mat)Sets the fields to create a transformation equal to mat.

References center, SbMatrix::getTransform(), rotation, scaleFactor, scaleOrientation, and translation.

Referenced by multLeft(), and multRight().

void SoTransform::recenter (const SbVec3f & newcenter)Sets the center field to newcenter. This might affect one or more of the other fields.

References center, SbMatrix::getTransform(), rotation, scaleFactor, scaleOrientation, SbMatrix::setTransform(), and translation.

void SoTransform::doAction (SoAction * action) [virtual]This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References center, SoAction::getState(), rotation, scaleFactor, scaleOrientation, SbMatrix::setTransform(), and translation.

Referenced by callback(), getBoundingBox(), getPrimitiveCount(), GLRender(), and pick().

void SoTransform::GLRender (SoGLRenderAction * action) [virtual]Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References doAction().

void SoTransform::callback (SoCallbackAction * action) [virtual]Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References doAction().

void SoTransform::getBoundingBox (SoGetBoundingBoxAction * action) [virtual]Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References doAction().

void SoTransform::getMatrix (SoGetMatrixAction * action) [virtual]Action method for SoGetMatrixAction.

Updates action by accumulating with the transformation matrix of this node (if any).

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References center, SoGetMatrixAction::getInverse(), SoGetMatrixAction::getMatrix(), SbMatrix::inverse(), SbMatrix::multLeft(), SbMatrix::multRight(), rotation, scaleFactor, scaleOrientation, SbMatrix::setTransform(), and translation.

void SoTransform::pick (SoPickAction * action) [virtual]Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

Reimplemented in SoTransformManip.

References doAction().

void SoTransform::getPrimitiveCount (SoGetPrimitiveCountAction * action) [virtual]Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

References doAction().

Member Data Documentation

SoSFVec3f SoTransform::translationThe translation part of the transformation.

Referenced by SoTransformManip::attachSensors(), doAction(), SoTransformManip::fieldSensorCB(), getMatrix(), getTranslationSpaceMatrix(), multLeft(), multRight(), pointAt(), recenter(), setMatrix(), SoTransform(), SoTransformManip::transferFieldValues(), and SoTransformManip::valueChangedCB().

SoSFRotation SoTransform::rotationThe 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);
 

 

Referenced by SoTransformManip::attachSensors(), doAction(), SoTransformManip::fieldSensorCB(), getMatrix(), getRotationSpaceMatrix(), getTranslationSpaceMatrix(), multLeft(), multRight(), pointAt(), recenter(), setMatrix(), SoTransform(), SoTransformManip::transferFieldValues(), and SoTransformManip::valueChangedCB().

SoSFVec3f SoTransform::scaleFactorThe scaling part of the transformation.

Referenced by SoTransformManip::attachSensors(), doAction(), SoTransformManip::fieldSensorCB(), getMatrix(), getRotationSpaceMatrix(), getScaleSpaceMatrix(), getTranslationSpaceMatrix(), multLeft(), multRight(), pointAt(), recenter(), setMatrix(), SoTransform(), SoTransformManip::transferFieldValues(), and SoTransformManip::valueChangedCB().

SoSFRotation SoTransform::scaleOrientationThe orientation the object is set to before scaling.

Referenced by SoTransformManip::attachSensors(), doAction(), SoTransformManip::fieldSensorCB(), getMatrix(), getRotationSpaceMatrix(), getScaleSpaceMatrix(), getTranslationSpaceMatrix(), multLeft(), multRight(), pointAt(), recenter(), setMatrix(), SoTransform(), SoTransformManip::transferFieldValues(), and SoTransformManip::valueChangedCB().

SoSFVec3f SoTransform::centerThe center point for the rotation.

Referenced by SoTransformManip::attachSensors(), doAction(), SoTransformManip::fieldSensorCB(), getMatrix(), getRotationSpaceMatrix(), getScaleSpaceMatrix(), getTranslationSpaceMatrix(), multLeft(), multRight(), pointAt(), recenter(), setMatrix(), SoTransform(), SoTransformManip::transferFieldValues(), and SoTransformManip::valueChangedCB().

Author

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