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NAME
SoVRMLIndexedFaceSet -
The SoVRMLIndexedFaceSet class is used for representing a generic 3D shape.
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/SoVRMLIndexedFaceSet.h>
Inherits SoVRMLIndexedShape.
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.
SoVRMLIndexedFaceSet (void)
virtual void GLRender (SoGLRenderAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual SbBool generateDefaultNormals (SoState *s, SoNormalBundle *nb)
virtual SbBool generateDefaultNormals (SoState *state, SoNormalCache *nc)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFBool ccw
SoSFBool solid
SoSFBool convex
SoSFFloat creaseAngle
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLIndexedFaceSet ()
virtual void generatePrimitives (SoAction *action)
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Additional Inherited Members
Detailed Description
The SoVRMLIndexedFaceSet class is used for representing a generic 3D shape.
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:
IndexedFaceSet {
eventIn MFInt32 set_colorIndex
eventIn MFInt32 set_coordIndex
eventIn MFInt32 set_normalIndex
eventIn MFInt32 set_texCoordIndex
exposedField SFNode color NULL
exposedField SFNode coord NULL
exposedField SFNode normal NULL
exposedField SFNode texCoord NULL
field SFBool ccw TRUE
field MFInt32 colorIndex [] # [-1,)
field SFBool colorPerVertex TRUE
field SFBool convex TRUE
field MFInt32 coordIndex [] # [-1,)
field SFFloat creaseAngle 0 # [0,)
field MFInt32 normalIndex [] # [-1,)
field SFBool normalPerVertex TRUE
field SFBool solid TRUE
field MFInt32 texCoordIndex [] # [-1,)
}
The IndexedFaceSet node represents a 3D shape formed by constructing faces (polygons) from
vertices listed in the coord field. The coord field contains a Coordinate node that
defines the 3D vertices referenced by the coordIndex field. IndexedFaceSet uses the
indices in its coordIndex field to specify the polygonal faces by indexing into the
coordinates in the Coordinate node. An index of '-1' indicates that the current face has
ended and the next one begins. The last face may be (but does not have to be) followed by
a '-1' index. If the greatest index in the coordIndex field is N, the Coordinate node
shall contain N+1 coordinates (indexed as 0 to N). Each face of the IndexedFaceSet shall
have:
• at least three non-coincident vertices;
• vertices that define a planar polygon;
• vertices that define a non-self-intersecting polygon.
Otherwise, The results are undefined.
The IndexedFaceSet node is specified in the local coordinate system and is affected by the
transformations of its ancestors.
Descriptions of the coord, normal, and texCoord fields are provided in the
SoVRMLCoordinate, SoVRMLNormal, and SoVRMLTextureCoordinate nodes, respectively.
Details on lighting equations and the interaction between color field, normal field,
textures, materials, and geometries are provided in 4.14, Lighting model.
If the color field is not NULL, it shall contain a Color node whose colours are applied to
the vertices or faces of the IndexedFaceSet as follows:
• If colorPerVertex is FALSE, colours are applied to each face, as follows:
• If the colorIndex field is not empty, then one colour is used for each face of the
IndexedFaceSet. There shall be at least as many indices in the colorIndex field as
there are faces in the IndexedFaceSet. If the greatest index in the colorIndex field
is N, then there shall be N+1 colours in the Color node. The colorIndex field shall
not contain any negative entries.
• If the colorIndex field is empty, then the colours in the Color node are applied to
each face of the IndexedFaceSet in order. There shall be at least as many colours in
the Color node as there are faces.
• If colorPerVertex is TRUE, colours are applied to each vertex, as follows:
• If the colorIndex field is not empty, then colours are applied to each vertex of the
IndexedFaceSet in exactly the same manner that the coordIndex field is used to choose
coordinates for each vertex from the Coordinate node. The colorIndex field shall
contain at least as many indices as the coordIndex field, and shall contain end-of-
face markers (-1) in exactly the same places as the coordIndex field. If the greatest
index in the colorIndex field is N, then there shall be N+1 colours in the Color node.
• If the colorIndex field is empty, then the coordIndex field is used to choose colours
from the Color node. If the greatest index in the coordIndex field is N, then there
shall be N+1 colours in the Color node.
If the color field is NULL, the geometry shall be rendered normally using the Material and
texture defined in the Appearance node (see 4.14, Lighting model, for details
http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.5).
If the normal field is not NULL, it shall contain a Normal node whose normals are applied
to the vertices or faces of the IndexedFaceSet in a manner exactly equivalent to that
described above for applying colours to vertices/faces (where normalPerVertex corresponds
to colorPerVertex and normalIndex corresponds to colorIndex). If the normal field is NULL,
the browser shall automatically generate normals, using creaseAngle to determine if and
how normals are smoothed across shared vertices (see 4.6.3.5, Crease angle field).
If the texCoord field is not NULL, it shall contain a TextureCoordinate node. The texture
coordinates in that node are applied to the vertices of the IndexedFaceSet as follows: If
the texCoordIndex field is not empty, then it is used to choose texture coordinates for
each vertex of the IndexedFaceSet in exactly the same manner that the coordIndex field is
used to choose coordinates for each vertex from the Coordinate node. The texCoordIndex
field shall contain at least as many indices as the coordIndex field, and shall contain
end-of-face markers (-1) in exactly the same places as the coordIndex field. If the
greatest index in the texCoordIndex field is N, then there shall be N+1 texture
coordinates in the TextureCoordinate node.
If the texCoordIndex field is empty, then the coordIndex array is used to choose texture
coordinates from the TextureCoordinate node. If the greatest index in the coordIndex field
is N, then there shall be N+1 texture coordinates in the TextureCoordinate node. If the
texCoord field is NULL, a default texture coordinate mapping is calculated using the local
coordinate system bounding box of the shape. The longest dimension of the bounding box
defines the S coordinates, and the next longest defines the T coordinates. If two or all
three dimensions of the bounding box are equal, ties shall be broken by choosing the X, Y,
or Z dimension in that order of preference. The value of the S coordinate ranges from 0 to
1, from one end of the bounding box to the other. The T coordinate ranges between 0 and
the ratio of the second greatest dimension of the bounding box to the greatest dimension.
Figure 6.10 illustrates the default texture coordinates for a simple box shaped
IndexedFaceSet with an X dimension twice as large as the Z dimension and four times as
large as the Y dimension. Figure 6.11 illustrates the original texture image used on the
IndexedFaceSet used in Figure 6.10.
Figure 6.10
Figure 6.11
Subclause 4.6.3, Shapes and geometry (http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.5), provides a description of the ccw, solid,
convex, and creaseAngle fields.
Constructor & Destructor Documentation
SoVRMLIndexedFaceSet::SoVRMLIndexedFaceSet (void)
Constructor.
SoVRMLIndexedFaceSet::~SoVRMLIndexedFaceSet () [protected], [virtual]
Destructor.
Member Function Documentation
SoType SoVRMLIndexedFaceSet::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.
Reimplemented from SoVRMLIndexedShape.
const SoFieldData * SoVRMLIndexedFaceSet::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 SoVRMLIndexedShape.
void SoVRMLIndexedFaceSet::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 SoVRMLVertexShape.
void SoVRMLIndexedFaceSet::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 SoShape.
virtual SbBool SoVRMLIndexedFaceSet::generateDefaultNormals (SoState *s, SoNormalBundle *nb)
[virtual]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
Subclasses should override this method to generate default normals using the
SoNormalBundle class. TRUE should be returned if normals were generated, FALSE otherwise.
Default method returns FALSE.
This function is an extension for Coin, and it is not available in the original SGI Open
Inventor v2.1 API.
Reimplemented from SoVRMLVertexShape.
SbBool SoVRMLIndexedFaceSet::generateDefaultNormals (SoState *s, SoNormalCache *nc) [virtual]
This API member is considered internal to the library, as it is not likely to be of
interest to the application programmer.
Subclasses should override this method to generate default normals using the SoNormalCache
class. This is more effective than using SoNormalGenerator. Return TRUE if normals were
generated, FALSE otherwise.
Default method just returns FALSE.
This function is an extension for Coin, and it is not available in the original SGI Open
Inventor v2.1 API.
Reimplemented from SoVRMLVertexShape.
void SoVRMLIndexedFaceSet::generatePrimitives (SoAction *action) [protected], [virtual]
The method implements action behavior for shape nodes for SoCallbackAction. It is invoked
from SoShape::callback(). (Subclasses should not override SoNode::callback().)
The subclass implementations uses the convenience methods SoShape::beginShape(),
SoShape::shapeVertex(), and SoShape::endShape(), with SoDetail instances, to pass the
primitives making up the shape back to the caller.
Implements SoShape.
Member Data Documentation
SoSFBool SoVRMLIndexedFaceSet::ccw
Specifies if vertex ordering is counterclockwise. Default value is TRUE.
SoSFBool SoVRMLIndexedFaceSet::solid
Can be used to enable backface culling. Default value is TRUE.
SoSFBool SoVRMLIndexedFaceSet::convex
Specifies if all polygons are convex. Default value is TRUE.
SoSFFloat SoVRMLIndexedFaceSet::creaseAngle
Specifies the crease angle for the generated normals. Default value is 0.0.
Author
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