Multiple Node Intersection

[marco....@elmansrl.eu]

Hi,

I need to make the selection (pick) of a node, going to check if that node is present within an area built around the mouse click point.

This should mean that, if there are more nodes inside that area, the pick event returns them to me.

Currently for the point selection, therefore of a single node in a specific x and y, I successfully use osgUtil :: LineSegmentIntersector.

Studying on the OSG book, I read that selection existed by checking inside a box, implemented by osgUtil :: PolytopeIntersector.

Below I propose part of the code,

double w(200), h(200);

osgUtil::PolytopeIntersector* picker = new osgUtil::PolytopeIntersector(osgUtil::Intersector::CoordinateFrame::WINDOW, x - w, y - h, x + w, y + h);

osgUtil::IntersectionVisitor iv(picker);

viewer->getCamera()->accept(iv);

if (picker->containsIntersections())

{

const osg::NodePath& nodePath = picker->getFirstIntersection().nodePath;

auto intersections = picker->getIntersections();

if (intersections.size() != 0) {

auto hitr = intersections.begin();

if (hitr->nodePath.size() != 0) {

for (int i = 0; i < hitr->nodePath.size(); i++) {

if (systemTargetMap[hitr->nodePath.at(i)->getName()]) {

      cout << "Node Name: " << systemTargetMap[hitr->nodePath.at(i)->getName()] << endl;

}

}

}

}}

Unfortunately, this selection only returns me one node, even if there are two (or more) very close together.

What am I doing wrong?

[Andrew Cunningham]

Hi ,
Maybe you figured it out by now, but you are only looking at the
"first intersection" of the picker ( getFirstIntersection). You need
to iterate over all intersections.

Andrew

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