Hi,
Guys, I have a pick problem. What I want to do is loading 10 points with their
loactions and colors. I want to use poly pick, and use another color to show
the picked points.
The loading points process is as follows:
Code:
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array;
osg::ref_ptr<osg::Vec4Array> clr = new osg::Vec4Array;
v->push_back(osg::Vec3(0.0, 0.0, 0.0));
... // 10 points in total
clr->push_back(osg::Vec4(1.0, 0.0, 1.0, 1.0f));
...// set the color
geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::POINTS, 0,
v->size()));
// after set the color and normal, add the geometry to Geode node
geode->addDrawable(geom.get());
Then I want to use ploy pick, the problem is : when I put the following codes
in the pick() function in Pickhandler class, I found out that the color of the
picked premitiveset has been changed, however, nothing changed in the view
window. The following codes are in pick function:
Code:
if (picker->containsIntersections())
{
osgUtil::PolytopeIntersector::Intersections intersections =
picker->getIntersections();
osgUtil::PolytopeIntersector::Intersections::iterator iter;
for (iter = intersections.begin(); iter != intersections.end(); iter++)
{
osg::NodePath nodepath = (*iter).nodePath;
node = (nodepath.size() >= 1) ? nodepath[nodepath.size() - 1] : 0;
int pointIndex = (*iter).primitiveIndex;
osg::Geode * geode = dynamic_cast<osg::Geode*> (node);
osg::Geometry * geom = dynamic_cast<osg::Geometry*>(geode->getDrawable(0));
osg::Vec4Array * clrary = dynamic_cast<osg::Vec4Array*>(geom->getColorArray());
clrary->operator [] (pointIndex) = osg::Vec4(0.0, 1.0, 0.0, 1.0f);
geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
node->addUpdateCallback(new CessnaCallback()); // not helpful
viewer->updateTraversal(); //not helpful
//viewer->run();//not helpful
}
}
First, I thought may be the colors have not been changed, so I tested changing
several points' color in the main function, like this:
Code:
osg::Geode * geode1 = dynamic_cast<osg::Geode*> (nodePt.get());
osg::Geometry * geom = dynamic_cast<osg::Geometry*>(geode1->getDrawable(0));
osg::Vec4Array * clrary = dynamic_cast<osg::Vec4Array*>(geom->getColorArray());
clrary->operator [] (10) = osg::Vec4(0.0, 1.0, 0.0, 1.0f);
clrary->operator [] (6) = osg::Vec4(0.0, 1.0, 0.0, 1.0f);
clrary->operator [] (2) = osg::Vec4(0.0, 1.0, 0.0, 1.0f);
geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
It changed the colors! So it confuses me why it can't work in the pick
function? Any body any idears?
Any ideas and suggestions would be appreciated!
Thank you!
Cheers,
Yexin
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=64994#64994
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