NAME
SoTextureCoordinatePlane -
The SoTextureCoordinatePlane class generates texture coordinates by
projecting onto a plane.
SoTextureCoordinatePlane is used for generating texture coordinates by
projecting the object onto a texture plane. The s, t and r texture
coordinates are computed as the distance from the origin to the
projected point, in the respective directions. The texture plane is
specified using two direction vectors, given as
SoTextureCoordinatePlane::directionS and
SoTextureCoordinatePlane::directionT in object space coordinates.
SoTextureCoordinatePlane::directionR is used for generating the third
coordinate, and can be used for generating texture coordinate for 3D
textures. For 2D textures you can just leave this field alone.
SYNOPSIS
#include <Inventor/nodes/SoTextureCoordinatePlane.h>
Inherits SoTextureCoordinateFunction.
Public Member Functions
SoTextureCoordinatePlane (void)
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void pick (SoPickAction *action)
virtual void callback (SoCallbackAction *action)
Static Public Member Functions
static void initClass (void)
Public Attributes
SoSFVec3f directionS
SoSFVec3f directionT
SoSFVec3f directionR
Protected Member Functions
virtual ~SoTextureCoordinatePlane ()
Detailed Description
The SoTextureCoordinatePlane class generates texture coordinates by
projecting onto a plane.
SoTextureCoordinatePlane is used for generating texture coordinates by
projecting the object onto a texture plane. The s, t and r texture
coordinates are computed as the distance from the origin to the
projected point, in the respective directions. The texture plane is
specified using two direction vectors, given as
SoTextureCoordinatePlane::directionS and
SoTextureCoordinatePlane::directionT in object space coordinates.
SoTextureCoordinatePlane::directionR is used for generating the third
coordinate, and can be used for generating texture coordinate for 3D
textures. For 2D textures you can just leave this field alone.
The length of the vector determines the repeat interval of the texture
per unit length.
A simple usage example:
SoSeparator *root = new SoSeparator;
root->ref();
// the texture image
SoTexture2 *tex = new SoTexture2;
tex->filename.setValue(’foo.png’);
root->addChild(tex);
// the texture plane
SoTextureCoordinatePlane *texPlane = new SoTextureCoordinatePlane;
texPlane->directionS.setValue(SbVec3f(1,0,0));
texPlane->directionT.setValue(SbVec3f(0,1,0));
root->addChild(texPlane);
// add a simple cube
SoCube * c = new SoCube;
c->width.setValue(1.0);
c->height.setValue(1.0)
c->depth.setValue(1.0);
root->addChild(new SoCube);
Here, we are projecting a texture onto a cube. The texture coordinate
plane is specified by directionS = (1,0,0) and directionT = (0,1,0),
meaning that it is parallel to the front face of the cube. Setting e.g.
directionS = (0,1,0) and directionT = (-1,0,0) would rotate the texture
counterclockwise by 90 degrees. Setting them to ((2,0,0), (0,2,0))
results to the texture being repeated twice per unit, so the texture
appears four times on the 1x1 face.
Note that when you transform the cube, the transformation will also
affect the texture - it will be transformed vs. the rest of the world,
but appear ’fixed’ on the object. If you want to change the placement
of the texture on the object, you have to insert a SoTexture2Transform
node before the texture coordinate plane. For instance in the example
above, since the cube is centered in its coordinate system, the lower
left corner of the texture appears to be in the middle of the face. To
move the texture’s origin to coincide with the lower left corner of the
face, insert
SoTexture2Transform * tf = new SoTexture2Transform;
tf->translation.setValue(-0.5,-0.5);
root->addChild(tf);
before adding the texture coordinate plane.
FILE FORMAT/DEFAULTS:
TextureCoordinatePlane {
directionS 1 0 0
directionT 0 1 0
}
Constructor & Destructor Documentation
SoTextureCoordinatePlane::SoTextureCoordinatePlane (void) Constructor.
SoTextureCoordinatePlane::~SoTextureCoordinatePlane () [protected, virtual]
Destructor.
Member Function Documentation
void SoTextureCoordinatePlane::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 SoTextureCoordinateFunction.
void SoTextureCoordinatePlane::doAction (SoAction * action) [virtual] This
function performs the typical operation of a node for any action.
Reimplemented from SoNode.
void SoTextureCoordinatePlane::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 SoTextureCoordinatePlane::pick (SoPickAction * action) [virtual]
Action method for SoPickAction.
Does common processing for SoPickAction action instances.
Reimplemented from SoNode.
void SoTextureCoordinatePlane::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.
Member Data Documentation
SoSFVec3f SoTextureCoordinatePlane::directionS The S texture coordinate
plane direction. The length of the vector determines the repeat
interval of the texture per unit length.
SoSFVec3f SoTextureCoordinatePlane::directionT The T texture coordinate
plane direction. The length of the vector determines the repeat
interval of the texture per unit length.
SoSFVec3f SoTextureCoordinatePlane::directionR The R texture coordinate
plane direction. The length of the vector determines the repeat
interval of the texture per unit length.
Author
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