NAME

       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 () [protected],  [virtual]
       Destructor.

Member Function Documentation

   SoType SoVRMLTextureTransform::getTypeId (void) const [virtual]
       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 SoFieldData * SoVRMLTextureTransform::getFieldData (void) const [protected],  [virtual]
       Returns a pointer to the class-wide field data storage object for this instance. If no
       fields are present, returns NULL.

       Reimplemented from SoFieldContainer.

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

       Reimplemented from SoNode.

   void SoVRMLTextureTransform::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.

   void SoVRMLTextureTransform::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.

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

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

       Reimplemented from SoNode.

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

       Does common processing for SoPickAction action instances.

       Reimplemented from SoNode.

Member Data Documentation

   SoSFVec2f SoVRMLTextureTransform::translation
       Translation value. Default values is (0, 0, 0).

   SoSFFloat SoVRMLTextureTransform::rotation
       Rotation, in radians, around the centre points. Default value is 0.

   SoSFVec2f SoVRMLTextureTransform::scale
       Scale vector about the centre point. Default value is (1, 1).

   SoSFVec2f SoVRMLTextureTransform::center
       Texture centre. Default value is (0.0, 0.0).

Author

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