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SoTextureCoordinate2.3coin2

NAME

SoTextureCoordinate2 -

The SoTextureCoordinate2 class contains a set of coordinates for the mapping of 2D textures.

When encountering nodes of this type during traversal, the coordinates it contains will be put on the state stack. Some shape nodes (for instance SoIndexedFaceSet, among many others) can then use these coordinates for explicit, detailed control of how textures are mapped to it's surfaces.

SYNOPSIS

#include <Inventor/nodes/SoTextureCoordinate2.h>

Inherits SoNode.

Public Member Functions

SoTextureCoordinate2 (void)

virtual void doAction (SoAction *action)

virtual void GLRender (SoGLRenderAction *action)

virtual void callback (SoCallbackAction *action)

virtual void pick (SoPickAction *action)

Static Public Member Functions

static void initClass (void)

Public Attributes

SoMFVec2f point

Protected Member Functions

virtual ~SoTextureCoordinate2 ()

Detailed Description

The SoTextureCoordinate2 class contains a set of coordinates for the mapping of 2D textures.

When encountering nodes of this type during traversal, the coordinates it contains will be put on the state stack. Some shape nodes (for instance SoIndexedFaceSet, among many others) can then use these coordinates for explicit, detailed control of how textures are mapped to it's surfaces.

(If texturemapping is used without any SoTextureCoordinate2 nodes in the scenegraph leading up to a shape node, all shape types have default fallbacks. So SoTextureCoordinate2 nodes are only necessary to use if you are not satisfied with the default mapping.)

Note that an SoTextureCoordinate2 node will replace the coordinates already present in the state (if any).

Here's a very simple example (in Inventor scenegraph file format -- mapping it to sourcecode is straightforward) that shows how to set up two quadratic polygons, one mapped 1:1 to the texture, the other using only the upper left quarter of the texture:

 Separator {
    Texture2 {
       image 6 8 3
       0x00ff0000 0x00ff0000 0x000000ff 0x000000ff 0x00ff00ff 0x00ff00ff
       0x00ff0000 0x00ff0000 0x000000ff 0x000000ff 0x00ff00ff 0x00ff00ff
       0x00ff0000 0x00ff0000 0x000000ff 0x000000ff 0x00ff00ff 0x00ff00ff
       0x0000ff00 0x0000ff00 0x0000ffff 0x0000ffff 0x0000ff00 0x0000ff00
       0x0000ff00 0x0000ff00 0x0000ffff 0x0000ffff 0x0000ff00 0x0000ff00
       0x00ffff00 0x00ffff00 0x000000ff 0x000000ff 0x00ffffff 0x00ffffff
       0x00ffff00 0x00ffff00 0x000000ff 0x000000ff 0x00ffffff 0x00ffffff
       0x00ffff00 0x00ffff00 0x000000ff 0x000000ff 0x00ffffff 0x00ffffff
    }
 
    Coordinate3 { point [ -1 -1 0, 1 -1 0, 1 1 0, -1 1 0 ] }
 
    # '1:1 mapping' to actual texture appearance. (Note that Y goes
    # from bottom to top, versus the common way of specifying bitmap
    # data from top to bottom.)
    TextureCoordinate2 { point [ 0 1, 1 1, 1 0, 0 0 ] }
 
    IndexedFaceSet {
       coordIndex [ 0, 1, 2, 3, -1 ]
       textureCoordIndex [ 0, 1, 2, 3, -1 ]
    }
 
    Translation { translation +4 0 0 }
 
    # Top left corner.
    TextureCoordinate2 { point [ 0 0.5, 0.5 0.5, 0.5 0, 0 0 ] }
 
    IndexedFaceSet {
       coordIndex [ 0, 1, 2, 3, -1 ]
       textureCoordIndex [ 0, 1, 2, 3, -1 ]
    }
 }
 

FILE FORMAT/DEFAULTS:

     TextureCoordinate2 {
         point [  ]
     }
 
 

See also:

SoTextureCoordinateFunction, SoTextureCoordinateBinding

Constructor & Destructor Documentation

SoTextureCoordinate2::SoTextureCoordinate2 (void)Constructor.

References point.

SoTextureCoordinate2::~SoTextureCoordinate2 () [protected, virtual]Destructor.

Member Function Documentation

void SoTextureCoordinate2::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.

References SoNode::VRML1.

void SoTextureCoordinate2::doAction (SoAction * action) [virtual]This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

References SoFieldContainer::get(), SoMField::getNum(), SoAction::getState(), SoMFVec2f::getValues(), and point.

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

void SoTextureCoordinate2::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.

References doAction(), SoFieldContainer::get(), SoNode::getNodeId(), SoMField::getNum(), SoAction::getState(), SoMFVec2f::getValues(), point, SoBase::staticDataLock(), and SoBase::staticDataUnlock().

void SoTextureCoordinate2::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.

References doAction().

void SoTextureCoordinate2::pick (SoPickAction * action) [virtual]Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

References doAction().

Member Data Documentation

SoMFVec2f SoTextureCoordinate2::pointThe set of 2D texture coordinates. Default value of field is an empty set.

Texture coordinates are usually specified in normalized coordinates, ie in the range [0, 1]. (0, 0) is the lower left corner, while (1, 1) is the upper right corner of the texture image. Coordinates outside the [0, 1] range can be used to repeat the texture across a surface.

See also:

SoTexure2::wrapS, SoTexture2::wrapT

Referenced by doAction(), GLRender(), and SoTextureCoordinate2().

Author

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