Hi,
This is how I create four vertices and bind them to a MatrixTransform. It's not
required to display the square drawn from four vertices:
Code:
osg::ref_ptr<osg::Vec3Array> vertices = new osg::Vec3Array;
vertices->push_back(osg::Vec3(0.0f, 0.0f, 0.0f ));
vertices->push_back(osg::Vec3(50.0f, 0.0f, 0.0f ));
vertices->push_back(osg::Vec3(50.0f, 50.0f, 0.0f ));
vertices->push_back(osg::Vec3(0.0f, 50.0f, 0.0f ));
osg::ref_ptr<osg::Geode> geode= new osg::Geode;
osg::ref_ptr<osg::Geometry> geometry= new osg::Geometry;
geometry->setVertexArray(vertices);
geode->addDrawable(geometry.get());
matrixTransform->addChild(geode);
matrixTransform will be updated constantly, so will the vertice coordinates
mapped to it. Now I want to retrieve the coordinates of each vertex with
matrixTransform applied
The following code retrieves the same coordinates as I have pushed into the
Vec3Array above.
Code:
osg::Vec3 v1;
osg::Vec3Array* vertices ;
vertices =
static_cast<osg::Vec3Array*>(marker1->getChild(0)->asGeode()->getDrawable(0)->asGeometry()->getVertexArray()
);
td::cout << "----" << std::endl;
for(unsigned int j=0; j<vertices->getNumElements(); j++){
v1 = (*vertices)[j];
std::cout << v1.x() << " " << v1.y() << " " << v1.z() << std::endl;
}
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=49175#49175
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