Hello Robert,
i find out something. I try to print out the adress of the geometry
object and the vertices like the following lines:
std::cout << "Adresse Geometry: " << &(*geometry) << std::endl;
std::cout << "Adresse Vertices: " << &(*vertices) << std::endl;
The result was...
In LineSegmentIntersector:
---------------------------
Adresse Geometry: 0x90de2f8
Adresse Vertices: 0
In my application:
---------------------------
Adresse Geometry: 0x90de2f8
Adresse Vertices: 0x90df848
Also my idea was, the cast is faild. Now, I change the dynamic_cast to
the reinterpret_cast and now it works fine!
I use Fedora10 and the gcc compiler version 4.3.1.
Cheers,
Martin
Am Montag, den 22.06.2009, 13:33 +0100 schrieb Robert Osfield:
> Hi Martin,
>
> A perplexing result for which I have no answer.
>
> Robert.
>
> 2009/6/22 Großer Martin <[email protected]>:
> > Hello Robert,
> >
> > I dig into the LineSegmentIntersector code and I found the lines 391 - 399:
> >
> > if (geometry) // it is true
> > {
> > osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>
> > (geometry->getVertexArray());
> >
> > if (vertices) // it is always false
> > {
> > osg::Vec3* first = &(vertices->front());
> > if (triHit._v1)
> > {
> > hit.indexList.push_back(triHit._v1-first);
> > hit.ratioList.push_back(triHit._r1);
> > }
> >
> > [...]
> >
> > "if (vertices)" is always false, but the geometry has a vertices. In my
> > application I wrote the following code:
> >
> > const osgUtil::LineSegmentIntersector::Intersection hit =
> > _ray->getFirstIntersection();
> > ::osg::Drawable* drawable = hit.drawable.get();
> > ::osg::Geometry* geometry = drawable ? drawable->asGeometry() : 0;
> > ::osg::Vec3Array* vertices = geometry ? dynamic_cast<
> > ::osg::Vec3Array*>(geometry->getVertexArray()) : 0;
> >
> > Here is the test "if (vertices)" true. It is for me irreproducible. There
> > are not the same geometries with the same vertices in the
> > LineSegementIntersector and in my
> >
> > Cheers,
> >
> >
> > Martin
> >
> >
> >
> > Am Montag, den 22.06.2009, 08:53 +0100 schrieb Robert Osfield:
> >
> > Hi Martin,
> >
> > You'll need to dig into the LineSegmentIntersector code to answer this
> > question.
> >
> > Robert.
> >
> > 2009/6/22 Großer Martin <[email protected]>:
> >> Hello Robert,
> >>
> >> now, I use the osgUtil::IntersectionVisitor. The example was very
> >> helpfully.
> >> But I have a new little problem. I get the first intersection:
> >>
> >> const osgUtil::LineSegmentIntersector::Intersection hit =
> >> _ray->getFirstIntersection();
> >>
> >> After this, I get the intersection point in world coordinates:
> >>
> >> osg::Vec3 intersectionPoint = hit.getWorldIntersectPoint();
> >>
> >> This vector is right. But the index list and the ratio list are empty.
> >>
> >> // get the vertex indices.
> >> const osgUtil::LineSegmentIntersector::Intersection::IndexList& indices =
> >> hit.indexList;
> >> // bary coords
> >> const osgUtil::LineSegmentIntersector::Intersection::RatioList& ratios =
> >> hit.ratioList;
> >> if (indices.size()==3 && ratios.size()==3) // is always false
> >> {
> >> // TO DO
> >> }
> >>
> >> What is my mistake? Have you an idea?
> >>
> >> Cheers,
> >>
> >> Martin
> >>
> >>
> >>
> >> Am Freitag, den 19.06.2009, 15:18 +0100 schrieb Robert Osfield:
> >>
> >> Hi Martin,
> >>
> >> I would recommend using the osgUtil::IntersectionVisitor rather than
> >> the osgUtil::IntersectVisitor as the later is deprecated and only kept
> >> around for backwards compatibility.
> >>
> >> As for examples of getting the texture coords of a ray intersections
> >> have a look at the osgViewer::InteractiveImageHandler implementation
> >> in src/osgViewer/ViewerEventHandlers.cpp as it does just this.
> >>
> >> Robert.
> >>
> >> 2009/6/19 Großer Martin <[email protected]>:
> >>> Hello all,
> >>>
> >>> i use the intersectVisitor to get the intersection between a ray and a
> >>> geode. It works fine and I'm very happy, because it is very comfortable.
> >>> Now I have the point (vector) of intersection, but I need the triangle
> >>> of the drawable what I hit. I would like calculate the barycentric
> >>> coordinates of the point. With this coordinates I want to calculate the
> >>> texture coordinates of my intersection point.
> >>>
> >>> There are a comfortable way in osg? Or have anyone a idea for a nice
> >>> solution? I think the intersectVisitor find the triangle, but i can't
> >>> get this information.
> >>>
> >>>
> >>> Cheers
> >>>
> >>> Martin
> >>>
> >>> _______________________________________________
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> >>>
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> >>
> >>
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> >
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> >
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