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.
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.
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.
void SoTransform::doAction (SoAction * action) [virtual] This function
performs the typical operation of a node for any action.
Reimplemented from SoNode.
Reimplemented in SoTransformManip.
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.
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.
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.
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.
void SoTransform::pick (SoPickAction * action) [virtual] Action method for
SoPickAction.
Does common processing for SoPickAction action instances.
Reimplemented from SoNode.
Reimplemented in SoTransformManip.
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.
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.
Author
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