The points drawn are square

[GuoJiaoyang]

The points drawn using the same code in osgqt are square, while the points drawn using the window created by osg's built - in functions are round.

osg::ref_ptrosg::Node createPoint()
{
osg::ref_ptrosg::Group root = new osg::Group;
osg::ref_ptrosg::Geode geode = new osg::Geode;
root->addChild(geode);
osg::ref_ptrosg::Geometry geometry = new osg::Geometry;
geode->addDrawable(geometry);
osg::ref_ptrosg::Vec3Array vertices = new osg::Vec3Array;
vertices->push_back(osg::Vec3(30.0f, 30.0f, 30.0f));
geometry->setVertexArray(vertices);
geometry->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0, vertices->size()));

osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(255.0f, 1.0f, 0.0f, 1.0f));
geometry->setColorArray(colors, osg::Array::BIND_OVERALL);
osg::ref_ptr<osg::StateSet> stateSet = geode->getOrCreateStateSet();


stateSet->setMode(GL_POINT_SMOOTH, osg::StateAttribute::ON);
stateSet->setMode(GL_BLEND, osg::StateAttribute::ON);
osg::ref_ptr<osg::BlendFunc> blendFunc = new osg::BlendFunc;
blendFunc->setFunction(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
stateSet->setAttributeAndModes(blendFunc, osg::StateAttribute::ON);
osg::ref_ptr<osg::Point> point = new osg::Point;
point->setSize(30.0f);
stateSet->setAttributeAndModes(point, osg::StateAttribute::ON);

return root;

}