[osg-users] how to draw a Curved Surface?

[Bean Bean]

Hi Sebastian,
                     I use the way about your method, but I get zero point.
I may use wrong. Here is the code:
       const float x = v1.x();
const float y = v1.y();
const float look_offSet = 10.0f;
osg::ref_ptr<osgUtil::PolytopeIntersector> polyIt = new
osgUtil::PolytopeIntersector(osgUtil::Intersector::PROJECTION, x -
look_offSet , y - look_offSet, x + look_offSet, y + look_offSet );
polyIt->setDimensionMask(osgUtil::PolytopeIntersector::DimZero);    // only
pick points

osgUtil::IntersectionVisitor iv(polyIt );

m_OSG->getViewer()->getCamera()->accept(iv);
osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array;

if (polyIt->containsIntersections())    //this is "false"    Why???
{
                           .....
         }
cheers,
Bean
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