Hi, David try to replace osg::ref_ptr<osg::DrawArrays> da = new osg::DrawArrays( osg::PrimitiveSet::LINES, 1, 2 ) ; with osg::ref_ptr<osg::DrawArrays> da = new osg::DrawArrays( osg::PrimitiveSet::LINES, 0, 2 ) ;
Cheers 21.10.2011, 04:29, "David Smith" <[email protected]>: > Hello, > > I'm having trouble with drawing a line. > > A little background. I have a graph with vertices and edges represented in > the boost graph library. I am using boost to find some coordinates for me to > layout the graph graphically. For each vertex I then draw a model at its > location. For each edge I then attempt to draw a line between the locations > of the models. Problem is that doesn't work. The lines go from the origin to > the vertices. It does not go from vertex to vertex. Now some code: > > Code: > > for ( ; it != end ; ++it ) { > VertexID id = *it ; > Vertex* vertex = &(*ng)[id] ; > osg::ref_ptr<osg::Node> cModel = > (osg::Node*)model->clone(osg::CopyOp::DEEP_COPY_NODES ) ; > > printf( "%d, x=%f, y=%f, z=%f\n", id, vertex->point[0], 0.0f, > vertex->point[1] ) ; > osg::ref_ptr<osg::PositionAttitudeTransform> transform = new > osg::PositionAttitudeTransform( ) ; > transform->setPosition( osg::Vec3f( vertex->point[0], 0.0f, vertex->point[1] > ) ) ; > transform->addChild( cModel ) ; > > root->addChild( transform ) ; > } > > boost::tie( eit, eend ) = edges(*ng) ; > for( ; eit != eend ; ++eit ) { > EdgeID ide = *eit ; > Edge& edge = (*ng)[ide] ; > VertexID srcId = source( ide, *ng ) ; > VertexID dstId = target( ide, *ng ) ; > Vertex* src = &(*ng)[srcId] ; > Vertex* dst = &(*ng)[dstId] ; > > printf( "%d, x=%f, y=%f, z=%f\n", dstId, dst->point[0], 0.0f, dst->point[1] > ) ; > printf( "%d, x=%f, y=%f, z=%f\n", srcId, src->point[0], 0.0f, src->point[1] > ) ; > > osg::Geometry* lg = new osg::Geometry( ) ; > > osg::Vec3Array* vs = new osg::Vec3Array( ) ; > vs->push_back( osg::Vec3f( src->point[0], 0.0f, src->point[1] ) ) ; > vs->push_back( osg::Vec3f( dst->point[0], 0.0f, dst->point[1] ) ) ; > > lg->setVertexArray( vs ); > > osg::ref_ptr<osg::DrawArrays> da = new osg::DrawArrays( > osg::PrimitiveSet::LINES, 1, 2 ) ; > lg->addPrimitiveSet( da ) ; > osg::ref_ptr<osg::Geode> lgeode = new osg::Geode( ) ; > > lgeode->addDrawable( lg ) ; > root->addChild( lgeode ) ; > } > > Now consider these two vertices: > 0, x=10.000000, y=0.000000, z=0.000000 > 1, x=9.510565, y=0.000000, z=3.090170 > > I add the model at each of them with a transform and then I draw a line from > one point to another. No translations are done as seen in the code above. > > So, what am I doing wrong? Do I need to draw a line and then translate it? > > Thanks! > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=43477#43477 > > _______________________________________________ > 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
