man SoVRMLTextureCoordinate (Fonctions bibliothèques) -

NAME

SoVRMLTextureCoordinate -

SYNOPSIS



#include <Inventor/VRMLnodes/SoVRMLTextureCoordinate.h>

Inherits SoNode.

Detailed Description

The SoVRMLTextureCoordinate class binds texture coordinates to vertex-based geometry.

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:. 

  TextureCoordinate {
    exposedField MFVec2f point  []      # (-inf, inf)
  }
  .fi


The TextureCoordinate node specifies a set of 2D texture coordinates used by vertex-based geometry nodes (e.g., SoVRMLIndexedFaceSet and SoVRMLElevationGrid) to map textures to vertices. Textures are two dimensional colour functions that, given an (s, t) coordinate, return a colour value colour(s, t). Texture map values (SoVRMLImageTexture, SoVRMLMovieTexture, and SoVRMLPixelTexture) range from [0.0, 1.0] along the S-axis and T-axis. However, TextureCoordinate values, specified by the point field, may be in the range (-inf,inf). Texture coordinates identify a location (and thus a colour value) in the texture map. The horizontal coordinate s is specified first, followed by the vertical coordinate t.

If the texture map is repeated in a given direction (S-axis or T-axis), a texture coordinate C (s or t) is mapped into a texture map that has N pixels in the given direction as follows:



  Texture map location = (C - floor(C)) × N 
  .fi


If the texture map is not repeated, the texture coordinates are clamped to the 0.0 to 1.0 range as follows:



  Texture map location = N, if C > 1.0, 
                       = 0.0, if C < 0.0, 
                       = C × N, if 0.0 <= C <= 1.0.
  .fi


Details on repeating textures are specific to texture map node types described in SoVRMLImageTexture, SoVRMLMovieTexture, and SoVRMLPixelTexture.

Public Member Functions

virtual SoType getTypeId (void) const

SoVRMLTextureCoordinate (void)

virtual void doAction (SoAction *action)

virtual void callback (SoCallbackAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void pick (SoPickAction *action)

virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoMFVec2f point

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoVRMLTextureCoordinate ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Constructor & Destructor Documentation

SoVRMLTextureCoordinate::SoVRMLTextureCoordinate (void)

Constructor.

SoVRMLTextureCoordinate::~SoVRMLTextureCoordinate () [protected, virtual]

Destructor.

Member Function Documentation

SoType SoVRMLTextureCoordinate::getClassTypeId (void) [static]

This static method returns the SoType object associated with objects of this class.

Reimplemented from SoNode.

SoType SoVRMLTextureCoordinate::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
    }
    else if (node->getTypeId().isOfType(SoGroup::getClassTypeId())) {
      SoGroup * group = (SoGroup *)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 ** SoVRMLTextureCoordinate::getFieldDataPtr (void) [static, protected]

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Reimplemented from SoNode.

const SoFieldData * SoVRMLTextureCoordinate::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 SoVRMLTextureCoordinate::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 SoNode.

void SoVRMLTextureCoordinate::doAction (SoAction * action) [virtual]

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

void SoVRMLTextureCoordinate::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 SoVRMLTextureCoordinate::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 SoVRMLTextureCoordinate::pick (SoPickAction * action) [virtual]

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

void SoVRMLTextureCoordinate::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

SoMFVec2f SoVRMLTextureCoordinate::point

The texture coordinates. Empty by default.

Author

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