Hi,
I'm trying to set up an Update Callback in osg::Geometry to dynamically change
the color of a vertex. I get no error, but my code is not evaluated ( cout in
Callback is not printing ). I attached my Callback to osg::Geometry ( a simple
Quad ) and setDataVariance( osg::Object::DYNAMIC ) ;
////////////////////////////////////////////
// Geometry Update Callback - Not Working //
////////////////////////////////////////////
class GeomCallback : public osg::Drawable::UpdateCallback
{
public :
GeomCallback() : _ramp( 0.0f ) {} ;
void operator()( osg::Node * node , osg::NodeVisitor * nodeVisitor )
{
std::cout << "in Callback !" << std::endl ;
osg::Geometry * geom = dynamic_cast< osg::Geometry * >( node
) ;
// geometry->getColorArray gives me an osg::Array, but I need a
osg::Vec4Array
// so I try to cast it, don't know if this works, but get no
error
osg::Vec4Array * cols = dynamic_cast< osg::Vec4Array * >( geom
-> getColorArray() ) ;
// As Cols is my Pointer to the Vec4Array I should be able to
assign different values
cols -> assign( 0 , osg::Vec4f( 0.5f + 0.5f * sin( _ramp ) ,
0.0f , 0.0f , 1.0f ) ) ;
_ramp += 0.01f ;
}
private :
float _ramp ;
} ;
Thank you!
Cheers,
Peter
------------------
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http://forum.openscenegraph.org/viewtopic.php?p=20956#20956
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