osg::Geomtery多图元重叠闪烁问题

void DrawGeom（）

{

if(!_geom.valid())

    {

        _geom = new osg::Geometry;

        _geom->setDataVariance(osg::Object::DYNAMIC);\

        _geom->getOrCreateStateSet()->setMode(GL_BLEND,osg::StateAttribute::ON);

        _geom->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

        osg::ref_ptr<osg::CullFace> cullface = new osg::CullFace(osg::CullFace::BACK);

             _geom->getOrCreateStateSet()->setAttribute(cullface.get());

                osg::PolygonOffset* polyoffset = new osg::PolygonOffset;

                polyoffset->setFactor(-100.0f);

                polyoffset->setUnits(-10.0f);

                osg::PolygonMode* polymode = new osg::PolygonMode;

                polymode->setMode(osg::PolygonMode::FRONT,osg::PolygonMode::FILL);

                _geom->getOrCreateStateSet()->setAttributeAndModes(polyoffset,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

                _geom->getOrCreateStateSet()->setAttributeAndModes(polymode,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON);

        //定义颜色数组

        osg::ref_ptr<osg::Vec4Array> c = new osg::Vec4Array;

        _geom->setColorArray(c.get());

        _geom->setColorBinding(osg::Geometry::BIND_OVERALL);

        c->push_back(_LineColor);

        //定义法线

        osg::ref_ptr<osg::Vec3Array> n = new osg::Vec3Array;

        _geom->setNormalArray(n.get());

        _geom->setNormalBinding(osg::Geometry::BIND_OVERALL);

        n->push_back(osg::Vec3(0.f, -1.f, 0.f));

        _pointArray = new osg::Vec3Array;

        _geom->setVertexArray(_pointArray.get());

        osg::ref_ptr<osg::Geode> geode = new osg::Geode;

        geode->addDrawable(_geom.get());

        //geode->setUpdateCallback(new FadeCallback(_LineColor));

        geode->getOrCreateStateSet()->setAttributeAndModes(new osg::BlendFunc);

        geode->getOrCreateStateSet()->setMode(GL_BLEND,osg::StateAttribute::ON);

        geode->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);

        _shapeGroup->addChild(geode.get());

        primitiveSetCount = 0L;

    }

    _pointArray->push_back(wp1*mat);

    _pointArray->push_back(wp2*mat);

    _pointArray->push_back(wp3*mat);

    _pointArray->push_back(wp4*mat);

    _geom->addPrimitiveSet(

                new osg::DrawArrays(osg::PrimitiveSet::QUADS, primitiveSetCount*4, 4));

    primitiveSetCount++;

}

这样还是会有重叠的效果  试过很多方法 还是不行  没有好的opengl基础 真是空中楼阁  碰到点难得就不会 完全没有思路 跟着网上的东西走 心累 初学osg 记录自己的心路历程