Your geometry is probably using display lists (on by default). setVertexArray will dirty and rebuild them. A more efficient solution would be to disable display lists. If you do that, you should be able to change individual elements of your array and not have to set the entire array.
Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Allen Saucier Sent: Wednesday, April 15, 2009 3:26 PM To: [email protected] Subject: Re: [osg-users] Dinamic Line Drawing boooch (and anyone who might have suggestions...), I really appreciate the code you posted but I can't get it to work as you did. The ONLY way I was able to get the "lines" drawn was to RE-set the vertexArray of my geometry. Like so: m_ogeomTrailGeometry->setVertexArray(vad); However, this is an extremely expensive operation. Do you have any suggestions that I might try to lower my re-draw expense? Here's my code snippet: class class1 { public: osg::ref_ptr<osg::DrawArrays> m_podreTrailDrawElements; osg::ref_ptr<osg::Vec3Array> m_ov3aLineVerticesData; osg::ref_ptr<osg::Geometry > m_ogeomTrailGeometry; osg::ref_ptr<osg::Geode > m_ogeoTrailGeode; osg::Vec3d m_ov3dPrevPos; } class1::method_1(double xInitial, double yInitial, double zInitial) { // initialize previous to current point/position sent in m_ov3dPrevPos.set(xInitial, yInitial, zInitial); // curr pos osg::Vec3d ov3d(xInitial, yInitial, zInitial); m_podreTrailDrawElements= new osg::DrawArrays(osg::PrimitiveSet::LINE_STRIP); m_ov3aLineVerticesData = new osg::Vec3Array(); m_ogeomTrailGeometry = new osg::Geometry(); m_ogeoTrailGeode = new osg::Geode; m_ov3aLineVerticesData->push_back(m_ov3dPrevPos); // prev pos m_ov3aLineVerticesData->push_back(ov3d); // curr pos m_podreTrailDrawElements->setFirst(0); m_podreTrailDrawElements->setCount(m_ov3aLineVerticesData->size()); m_ogeomTrailGeometry->addPrimitiveSet(m_podreTrailDrawElements.get()); m_ogeomTrailGeometry->setVertexArray(m_ov3aLineVerticesData.get());// add line segs to geometry m_ogeoTrailGeode->addDrawable(m_ogeomTrailGeometry.get()); // ADD ONLY ONCE to the Node Scene m_no3vViewer->m_iAddElementToScene(m_ogeoTrailGeode.get()); } // method_1() class1::method_updateLine(double x, double y, double z) { osg::Vec3Array *vad = dynamic_cast<osg::Vec3Array *>(m_ogeomTrailGeometry->getVertexArray()); vad->push_back(osg::Vec3(x,y,z)); osg::DrawArrays *drArrys = dynamic_cast<osg::DrawArrays *>(m_ogeomTrailGeometry->getPrimitiveSet(0)); drArrys->setFirst(0); drArrys->setCount(vad->size()); //drArrys->dirty(); //std::cout<<" vad->size()=="<< vad->size() << std::endl; m_ogeomTrailGeometry->setVertexArray(vad); } ------------------------ ---- Allen ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=10277#10277 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
