I need to distinguish the vertexs in different models in vertex shaders
and fragment shaders .so I use a nodevisitor to transfer a attribute
variable to the vertex shaders.as follows:
I transfer different value to the vertex shader if the type is dedined
different.
class AnalysisNodeVisitor :public osg::NodeVisitor{
public:
AnalysisNodeVisitor(INPUTTYPE
type):osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN){
m_InputType=type;
}
virtual void apply(osg::Geode &node)
{
for ( unsigned int i=0; i<node.getNumDrawables(); ++i )
{
osg::Geometry* geom = dynamic_cast<osg::Geometry*>(node.getDrawable(i) );
if ( geom ){
osg::FloatArray *fa=new osg::FloatArray;
switch(m_InputType){
case INPUTTEXTURE:
{
fa->push_back(0.1);
break;
}
case INPUTMATERIAL:
{
fa->push_back(0.2);
break;
}
default :
{
fa->push_back(0.9);
}
}
geom->setVertexAttribArray(6,fa);
geom->setVertexAttribBinding(6,osg::Geometry::BIND_OVERALL);
}
}
traverse( node );
}
virtual void apply(osg::Node &node){
traverse(node);
}
public:
INPUTTYPE m_InputType;
};
and bind the attribute to the shader:
program->addBindAttribLocation("modelType",6);
but when I use the AnalysisNodeVisitor,I occur a error.
AnalysisNodeVisitor anvA(INPUTTEXTURE);
nodeA.accept(anvA);
AnalysisNodeVisitor anvB(INPUTMATERIAL);
nodeB.accept(anvB);
and in the vertex shader modelType variable of vertexs in nodeA should be
0.1 and modeType variable of vertexs in NodeB should be 0.2 ,but actually
modeType variable of all vertex is 0.2 .It <http://0.2.it/> seems
nodeB.accept(anvB) override the modeType variable of nodeA. what is wrong
with it?Am I misunderstand it ?
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