FGFS-4.1/OpenSceneGraph
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Ported picking across to using PickVisitor.

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This commit is contained in:
Robert Osfield
2005-12-23 10:59:31 +00:00
parent 58d82d0f66
commit 6fe4be23e6
1 changed files with 20 additions and 22 deletions
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42
examples/osgkeyboardmouse/osgkeyboardmouse.cpp
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@@ -120,45 +120,43 @@ public:
{
std::cout<<"Picking "<<x<<"\t"<<y<<std::endl;
int origX, origY, width, height;
_sceneView->getViewport(origX,origY,width,height);
// convert Produce's non dimensional x,y coords back into pixel coords.
int winX = (int)((x+1.0f)*0.5f*(float)width);
int winY = (int)((y+1.0f)*0.5f*(float)height);
osg::Vec3 nearPoint, farPoint;
_sceneView->projectWindowXYIntoObject(winX,winY,nearPoint,farPoint);
std::cout<<"nearPoint "<<nearPoint<<" farPoint "<<farPoint<<std::endl;
// make a line segment
osg::ref_ptr<osg::LineSegment> lineSegment = new osg::LineSegment(nearPoint,farPoint);
// create the IntersectVisitor to do the line intersection traversals.
osgUtil::IntersectVisitor intersector;
intersector.addLineSegment(lineSegment.get());
// convert Producer's non dimensional x,y coords back into pixel coords.
int pixel_x = (int)((x+1.0f)*0.5f*(float)width);
int pixel_y = (int)((y+1.0f)*0.5f*(float)height);
scene->accept(intersector);
osgUtil::IntersectVisitor::HitList& hits=intersector.getHitList(lineSegment.get());
if (!hits.empty())
osgUtil::PickVisitor pick(_sceneView->getViewport(),
_sceneView->getProjectionMatrix(),
_sceneView->getViewMatrix(),
pixel_x, pixel_y);
scene->accept(pick);
osgUtil::PickVisitor::LineSegmentHitListMap& segHitList = pick.getSegHitList();
if (!segHitList.empty() && !segHitList.begin()->second.empty())
{
std::cout<<"Got hits"<<std::endl;
// get the hits for the first segment
osgUtil::PickVisitor::HitList& hits = segHitList.begin()->second;
// just take the first hit - nearest the eye point.
osgUtil::Hit& hit = hits.front();
osg::NodePath& nodePath = hit._nodePath;
osg::Node* node = (nodePath.size()>=1)?nodePath[nodePath.size()-1]:0;
osg::Group* parent = (nodePath.size()>=2)?dynamic_cast<osg::Group*>(nodePath[nodePath.size()-2]):0;
if (node) std::cout<<" Hits "<<node->className()<<" nodePath size"<<nodePath.size()<<std::endl;
// now we try to decorate the hit node by the osgFX::Scribe to show that its been "picked"
if (parent && node)
{
std::cout<<"Hits "<<node->className()<<std::endl;
std::cout<<" parent "<<parent->className()<<std::endl;
std::cout<<" parent "<<parent->className()<<std::endl;
osgFX::Scribe* parentAsScribe = dynamic_cast<osgFX::Scribe*>(parent);
if (!parentAsScribe)