NAME
SoVRMLPixelTexture -
The SoVRMLPixelTexture class is used for mapping a texture image onto
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:
SYNOPSIS
#include <Inventor/VRMLnodes/SoVRMLPixelTexture.h>
Inherits SoVRMLTexture.
Public Member Functions
SoVRMLPixelTexture (void)
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void rayPick (SoRayPickAction *action)
Static Public Member Functions
static void initClass (void)
Public Attributes
SoSFImage image
Protected Member Functions
virtual ~SoVRMLPixelTexture ()
virtual SbBool readInstance (SoInput *in, unsigned short flags)
virtual void notify (SoNotList *list)
Detailed Description
The SoVRMLPixelTexture class is used for mapping a texture image onto
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:
PixelTexture {
exposedField SFImage image 0 0 0 # see SoSFImage
field SFBool repeatS TRUE
field SFBool repeatT TRUE
}
.fi
The PixelTexture node defines a 2D image-based texture map as an explicit array of pixel values (image field) and parameters controlling tiling repetition of the texture onto geometry. Texture maps are defined in a 2D coordinate system (s, t) that ranges from 0.0 to 1.0 in both directions. The bottom edge of the pixel image corresponds to the S-axis of the texture map, and left edge of the pixel image corresponds to the T-axis of the texture map. The lower-left pixel of the pixel image corresponds to s=0.0, t=0.0, and the top-right pixel of the image corresponds to s = 1.0, t = 1.0. See 4.6.11, Texture maps (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.11>), for a general description of texture maps. Figure 6.13 depicts an example PixelTexture.
Figure 6.13 -- PixelTexture node
See 4.14, Lighting model (<http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.14>), for a description of how the texture values interact with the appearance of the geometry. SoSFImage, describes the specification of an image. The repeatS and repeatT fields specify how the texture wraps in the S and T directions. If repeatS is TRUE (the default), the texture map is repeated outside the 0-to-1 texture coordinate range in the S direction so that it fills the shape. If repeatS is FALSE, the texture coordinates are clamped in the S direction to lie within the 0.0 to 1.0 range. The repeatT field is analogous to the repeatS field.
Constructor & Destructor Documentation
SoVRMLPixelTexture::SoVRMLPixelTexture (void) Constructor.
SoVRMLPixelTexture::~SoVRMLPixelTexture () [protected, virtual] Destructor.
Member Function Documentation
void SoVRMLPixelTexture::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 SoVRMLTexture.
void SoVRMLPixelTexture::doAction (SoAction * action) [virtual] This
function performs the typical operation of a node for any action.
Reimplemented from SoNode.
void SoVRMLPixelTexture::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 SoVRMLTexture.
void SoVRMLPixelTexture::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 SoVRMLPixelTexture::rayPick (SoRayPickAction * action) [virtual]
Action method for SoRayPickAction.
Checks the ray specification of the action and tests for intersection
with the data of the node.
Nodes influencing relevant state variables for how picking is done also
overrides this method.
Reimplemented from SoNode.
SbBool SoVRMLPixelTexture::readInstance (SoInput * in, unsigned short
flags) [protected, virtual] This method is mainly intended for internal
use during file import operations.
It reads a definition of an instance from the input stream in. The
input stream state points to the start of a serialized / persistant
representation of an instance of this class type.
TRUE or FALSE is returned, depending on if the instantiation and
configuration of the new object of this class type went ok or not. The
import process should be robust and handle corrupted input streams by
returning FALSE.
flags is used internally during binary import when reading user
extension nodes, group nodes or engines.
Reimplemented from SoNode.
void SoVRMLPixelTexture::notify (SoNotList * list) [protected, virtual]
Overloaded to detect when fields change.
Reimplemented from SoNode.
Author
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