NAME
SoMaterialBinding -
The SoMaterialBinding class is a node for setting up how materials are
mapped to shapes.
The material binding specified in nodes of this type decides how the
material values of SoMaterial nodes are mapped on the builtin geometry
shape nodes.
SYNOPSIS
#include <Inventor/nodes/SoMaterialBinding.h>
Inherits SoNode.
Public Types
enum Binding { OVERALL = SoMaterialBindingElement::OVERALL, PER_PART =
SoMaterialBindingElement::PER_PART, PER_PART_INDEXED =
SoMaterialBindingElement::PER_PART_INDEXED, PER_FACE =
SoMaterialBindingElement::PER_FACE, PER_FACE_INDEXED =
SoMaterialBindingElement::PER_FACE_INDEXED, PER_VERTEX =
SoMaterialBindingElement::PER_VERTEX, PER_VERTEX_INDEXED =
SoMaterialBindingElement::PER_VERTEX_INDEXED, DEFAULT = OVERALL,
NONE = OVERALL }
Public Member Functions
SoMaterialBinding (void)
virtual void doAction (SoAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void callback (SoCallbackAction *action)
virtual void pick (SoPickAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
Static Public Member Functions
static void initClass (void)
Public Attributes
SoSFEnum value
Protected Member Functions
virtual ~SoMaterialBinding ()
Detailed Description
The SoMaterialBinding class is a node for setting up how materials are
mapped to shapes.
The material binding specified in nodes of this type decides how the
material values of SoMaterial nodes are mapped on the builtin geometry
shape nodes.
The exact meaning of a binding depends on what particular shape type a
material or a set of materials are applied to.
Here is a very simple usage example:
#Inventor V2.1 ascii
Separator {
Coordinate3 {
point [ 0 0 0, 1 0 0, 1 1 0 ]
}
Material {
diffuseColor [ 1 0 0, 1 1 0, 0 0 1 ]
}
MaterialBinding {
value PER_VERTEX_INDEXED
}
IndexedFaceSet {
coordIndex [ 0, 1, 2, -1 ]
materialIndex [ 0, 1, 0 ]
}
}
.fi
With SoMaterialBinding::value set to PER_VERTEX_INDEXED above, the material indices will be taken from the SoIndexedFaceSet::materialIndex field when rendering.
If SoMaterialBinding::value was set to PER_VERTEX_INDEXED as above, and the SoIndexedFaceSet::materialIndex was undefined or empty, indices would implicitly be taken from the SoIndexedFaceSet::coordIndex field.
If SoMaterialBinding::value is set to PER_VERTEX, colors will be fetched in a monotonically increasing manner from the SoMaterial::diffuseColor field, starting at index 0.
FILE FORMAT/DEFAULTS:
MaterialBinding {
value OVERALL
}
See also:
SoMaterial
Member Enumeration Documentation
enum SoMaterialBinding::Binding Enumeration of available types of material
binding.
Enumerator:
OVERALL
Apply the same material to the complete shape.
PER_PART
Get a new material from the pool of material values for each
part of the shape, where the definition of a part depends on the
shape type.
Materials are fetched from index 0 and onwards, incrementing the index
into the material pool by 1 for each new part in the order defined by
the particular shape type.
Important portability note: it was previously allowed with the SGI
Inventor library to supply too few colors versus the number of parts of
the subsequent shapes in the scene graph. Coloring would then cycle
through the available colors.
Since SGI Open Inventor v2.1, this was disallowed, though -- enough
colors for all parts must be supplied, or behavior will be unspecified
(likely to cause a crash, in fact). Note that the «Inventor Mentor»
book contains a description of the old, invalid behavior in Chapter 5,
section ’Binding Nodes’ (middle of page 128 in the 10th printing).
PER_PART_INDEXED
Get a new material from the pool of material values for each
part of the shape, where the definition of a part depends on the
shape type.
Materials are fetched by the index value settings of the shape.
PER_FACE
Get a new material from the pool of material values for each
polygon face of the shape.
Materials are fetched from index 0 and onwards, incrementing the index
into the material pool by 1 for each new face of the shape node.
Note that individual faces after tessellation of complex shapes (like
SoCylinder nodes) are not considered to be separate entities, and so
this binding will be treated in the same manner as
SoMaterialBinding::PER_PART for those.
PER_FACE_INDEXED
Get a new material from the pool of material values for each
polygon face of the shape.
Materials are fetched by the index value settings of the shape.
Note that individual faces after tessellation of complex shapes (like
SoCylinder nodes) are not considered to be separate entities, and so
this binding will be treated in the same manner as
SoMaterialBinding::PER_PART_INDEXED for those.
PER_VERTEX
Get a new material from the pool of material values for each
polygon, line or point vertex of the shape.
Materials are fetched from index 0 and onwards, incrementing the index
into the material pool by 1 for each new vertex of the shape node.
PER_VERTEX_INDEXED
Get a new material from the pool of material values for each
polygon, line or point vertex of the shape.
Materials are fetched by the index value settings of the shape.
DEFAULT
Obsolete. Don’t use this value.
NONE Obsolete. Don’t use this value.
Constructor & Destructor Documentation
SoMaterialBinding::SoMaterialBinding (void) Constructor.
SoMaterialBinding::~SoMaterialBinding () [protected, virtual] Destructor.
Member Function Documentation
void SoMaterialBinding::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 SoMaterialBinding::doAction (SoAction * action) [virtual] This
function performs the typical operation of a node for any action.
Reimplemented from SoNode.
void SoMaterialBinding::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 SoMaterialBinding::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 SoMaterialBinding::pick (SoPickAction * action) [virtual] Action
method for SoPickAction.
Does common processing for SoPickAction action instances.
Reimplemented from SoNode.
void SoMaterialBinding::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
SoSFEnum SoMaterialBinding::value The material binding to use for
subsequent shape nodes in the scene graph. The default binding is
SoMaterialBinding::OVERALL.
Author
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