SoVRMLTextureTransform: The sovrmltexturetransform class defines a transformation applied to texture coordinates. the detailed class documentation is taken verbatim from the vrml97 standard (iso/iec 14772-1:1997). it is copyright the web3d consortium, and is used by permission of the consortium:

SYNOPSIS

#include <Inventor/VRMLnodes/SoVRMLTextureTransform.h>

Inherits SoNode.

Public Member Functions

virtual SoType getTypeId (void) const

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. SoVRMLTextureTransform (void)

virtual void doAction (SoAction *action)

virtual void callback (SoCallbackAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void getMatrix (SoGetMatrixAction *action)

virtual void pick (SoPickAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFVec2f translation

SoSFFloat rotation

SoSFVec2f scale

SoSFVec2f center

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoVRMLTextureTransform ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

The SoVRMLTextureTransform class defines a transformation applied to texture coordinates.

The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:

TextureTransform {
  exposedField SFVec2f center      0 0     # (-inf, inf)
  exposedField SFFloat rotation    0       # (-inf, inf)
  exposedField SFVec2f scale       1 1     # (-inf, inf)
  exposedField SFVec2f translation 0 0     # (-inf, inf)
}

The TextureTransform node defines a 2D transformation that is applied to texture coordinates (see SoVRMLTextureCoordinate). This node affects the way textures coordinates are applied to the geometric surface. The transformation consists of (in order):

a translation;
a rotation about the centre point;
a non-uniform scale about the centre point.

These parameters support changes to the size, orientation, and position of textures on shapes. Note that these operations appear reversed when viewed on the surface of geometry. For example, a scale value of (2 2) will scale the texture coordinates and have the net effect of shrinking the texture size by a factor of 2 (texture coordinates are twice as large and thus cause the texture to repeat). A translation of (0.5 0.0) translates the texture coordinates +.5 units along the S-axis and has the net effect of translating the texture -0.5 along the S-axis on the geometry's surface. A rotation of pi/2 of the texture coordinates results in a -pi/2 rotation of the texture on the geometry.

The center field specifies a translation offset in texture coordinate space about which the rotation and scale fields are applied. The scale field specifies a scaling factor in S and T of the texture coordinates about the center point. scale values shall be in the range (-pi, pi). The rotation field specifies a rotation in radians of the texture coordinates about the center point after the scale has been applied. A positive rotation value makes the texture coordinates rotate counterclockwise about the centre, thereby rotating the appearance of the texture itself clockwise. The translation field specifies a translation of the texture coordinates.

In matrix transformation notation, where Tc is the untransformed texture coordinate, Tc' is the transformed texture coordinate, C (center), T (translation), R (rotation), and S (scale) are the intermediate transformation matrices,

Tc' = -C × S × R × C × T × Tc

Note that this transformation order is the reverse of the Transform node transformation order since the texture coordinates, not the texture, are being transformed (i.e., the texture coordinate system).

Constructor & Destructor Documentation

SoVRMLTextureTransform::SoVRMLTextureTransform (void)

Constructor.

SoVRMLTextureTransform::~SoVRMLTextureTransform ()\fC [protected]\fP, \fC [virtual]\fP

Destructor.

Member Function Documentation

\fBSoType\fP SoVRMLTextureTransform::getTypeId (void) const\fC [virtual]\fP

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting. Usage example:

void foo(SoNode * node)
{
  if (node->getTypeId() == SoFile::getClassTypeId()) {
    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type
  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const \fBSoFieldData\fP * SoVRMLTextureTransform::getFieldData (void) const\fC [protected]\fP, \fC [virtual]\fP

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.