Simon Hammett wrote: > > Right I've had time to play with ClipNode, and what I said above is rubbish. > > You just need the matrix which transforms from the parent to the > intersection node. > > Given you are writing a tool kit, I suspect you can quickly and easily work > out > that transform from your objects. > > If not you to just need to find the parent node in the 'nodePath' > member of the intersection result and then run through to the end of > the nodePath > accumulating any matrices you find. > > Then invert that matrix and multiply the intersection point with it > and test it to inside > or outside your clip node as appropriate.
Ok, now ive got it working great. I solved it!
I worked out that depending on the scoll position of the scroll panel, i got a
different result from hitr->getLocalIntersectPoint() so i had to translate the
point.
Which way would be better, what i have now or what you just suggested?
Thank you Simon, your suggestions helped me loads!
Heres my finished code:
PWidgetBase* PWidgetHandler::pick(osg::ref_ptr<osgViewer::View> view, const
osgGA::GUIEventAdapter& ea)
{
osgUtil::LineSegmentIntersector::Intersections intersections;
std::string gdlist="";
float x = ea.getX();
float y = ea.getY();
#if 0
osg::ref_ptr< osgUtil::LineSegmentIntersector > picker = new
osgUtil::LineSegmentIntersector(osgUtil::Intersector::WINDOW, x, y);
osgUtil::IntersectionVisitor iv(picker.get());
view->getCamera()->accept(iv);
if (picker->containsIntersections())
{
intersections = picker->getIntersections();
#else
if (view->computeIntersections(x,y,intersections))
{
#endif
for
(osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin();
hitr != intersections.end();
++hitr)
{
if (!hitr->nodePath.empty())
{
osg::Node* node = hitr->nodePath.back();
if (node && node->getNumParents() > 0)
{
node = node->getParent(0);
while (node != NULL)
{
if (node &&
strcmp(node->className(), "PWidgetBase") == 0)
{
PWidgetBase*
obj = (PWidgetBase*)node;
if (obj)
{
bool
outside = false;
if
(obj->getParentWidget() && obj->getParentWidget()->getUsingClipBoundingBox())
{
osg::ref_ptr<osg::ClipNode> clipNode = obj->getParentWidget()->getClipNode();
if (clipNode)
{
osg::Vec3d pt = hitr->getLocalIntersectPoint();
osg::Vec3 position = obj->getPosition();
pt.x() += position.x() / 2.f;
pt.x() *= 2.f;
pt.y() += position.y();
pt.y() *= 2.f;
pt.z() += position.z() / 2.f;
pt.z() *= 5.f;
for (unsigned int i = 0; i < clipNode->getNumClipPlanes(); i++)
{
osg::ref_ptr<osg::ClipPlane> plane = clipNode->getClipPlane(i);
osg::Vec4d pl = plane->getClipPlane();
switch (i)
{
case 0:
{
if (pt.x() > pl.x())
outside = true;
break;
}
case 1:
{
if (pt.x() < pl.x())
outside = true;
break;
}
case 4:
{
if (pt.z() > pl.z())
outside = true;
break;
}
case 5:
{
if (pt.z() < pl.z())
outside = true;
break;
}
}
if (outside)
break;
}
}
}
if
(!outside)
return obj;
else
break;
}
}
if
(node->getNumParents() > 0)
node =
node->getParent(0);
else
break;
}
}
}
else if (hitr->drawable.valid())
{
return NULL;
}
}
}
return NULL;
};
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=12791#12791
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