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SoVertexAttributeBinding

NAME

SoVertexAttributeBinding -

The SoVertexAttributeBinding class is a node for setting up how vertex attributes are mapped to shapes.

SYNOPSIS

#include <Inventor/nodes/SoVertexAttributeBinding.h>

Inherits SoNode.

Public Types

enum Binding { OVERALL = SoVertexAttributeBindingElement::OVERALL, PER_VERTEX = SoVertexAttributeBindingElement::PER_VERTEX, PER_VERTEX_INDEXED = SoVertexAttributeBindingElement::PER_VERTEX_INDEXED, DEFAULT = PER_VERTEX_INDEXED }

Public Member Functions

SoVertexAttributeBinding (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 ~SoVertexAttributeBinding ()

Detailed Description

The SoVertexAttributeBinding class is a node for setting up how vertex attributes are mapped to shapes.

See also:

SoVertexAttribute

The material binding specified in nodes of this type decides how the vertex attribute values of SoVertexAttribute nodes are mapped on the builtin geometry shape nodes.

Here is a simple usage example:

 
   #Inventor V2.1 ascii
   
   ShaderProgram {
       shaderObject [ 
                     VertexShader {
                        sourceProgram "vertex.glsl"
                     }
                  ]
    }
 
    Coordinate3 {
       point [ 0 0 0, 1 0 0, 1 1 0 ]
    }
 
    VertexAttributeBinding { value OVERALL }
 
    VertexAttribute {
       typeName "SoMFVec3f"
       name "color"
       values [ 1.0 0.0 0.0 ]
    }
 
    IndexedFaceSet {
       coordIndex [ 0, 1, 2, -1 ]
    }
   .fi
 
 
 The vertex shader (vertex.glsl): 
 
   attribute vec3 color;
 
   void main(void)
   {
     gl_Position = ftransform();
     fragcolor = color;
   }
 
 

With SoVertexAttributeBinding::value set to PER_VERTEX_INDEXED above, the attribute indices will be taken from the SoIndexedFaceSet::coordIndex field when rendering.

If SoVertexAttributeBinding::value is set to PER_VERTEX, attributes will be fetched in a monotonically increasing manner from the SoVertexAttribute::value field, starting at index 0.

If SoVertexAttributeBinding::value is set to OVERALL, the first attribute value from SoVertexAttribute::value will be sent to OpenGL before rendering.

FILE FORMAT/DEFAULTS:

     VertexAttributeBinding {
         value PER_VERTEX_INDEXED
     }
 
 

See also:

SoVertexAttribute Be aware that this class is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

Since:

Coin 3.0

Member Enumeration Documentation

enum SoVertexAttributeBinding::BindingEnumeration of available types of material binding.

Enumerator:

OVERALL

Apply the same material to the complete shape.

PER_VERTEX

Get a new material from the pool of material values for each polygon, line or point vertex of the shape.

Attributes are fetched from index 0 and onwards, incrementing the index into the attribute pool by 1 for each new vertex of the shape node.

PER_VERTEX_INDEXED

Get a new attribute from the pool of attribute values for each polygon, line or point vertex of the shape.

Attributes are fetched by the index value settings of the shape.

Constructor & Destructor Documentation

SoVertexAttributeBinding::SoVertexAttributeBinding (void)Constructor.

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

Member Function Documentation

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

Reimplemented from SoNode.

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

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

void SoVertexAttributeBinding::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 SoVertexAttributeBinding::valueThe attribute binding to use for subsequent shape nodes in the scene graph. The default binding is SoVertexAttributeBinding::PER_VERTEX_INDEXED

Author

Generated automatically by Doxygen for Coin from the source code.