Hi Brad,
Have you checked if any your Vertex-Coordinates contain
Infs or NaNs?
Does you geometry have any degenerated primitives
such as lines or triangles with identical vertices?
Next thing I would check would be the consistency
of geometry with respect to array lengths.
If everythings checks out ok, you could add the
NaN-check in PolytopePrimitiveIntersector::checkCandidatePoints
(in src/osgUtil/PolytopeIntersector.cpp).
Cheers,
Peter
Am 23.02.2011 08:54, schrieb Christiansen, Brad:
> Hi,
>
>
>
> In my application I have found that the PolytopeIntersector is returning
> intersections with objects which are behind my camera. The code I am
> using is this:
>
>
>
> osgUtil::PolytopeIntersector* picker =
>
> new osgUtil::PolytopeIntersector(
>
> osgUtil::Intersector::WINDOW,
>
> leftX,
>
> bottomY,
>
> rightX,
>
> topY);
>
>
>
>
>
> osgUtil::IntersectionVisitor iv(picker);
>
> camera->getBound();
>
> camera->accept(iv);
>
>
>
> if (picker->containsIntersections()) {
>
>
>
> osgUtil::PolytopeIntersector::Intersections& intersections =
> picker->getIntersections();
>
> for (osgUtil::PolytopeIntersector::Intersections::iterator
> it=intersections.begin();
>
> it!=intersections.end(); ++it) {
>
>
>
> osgUtil::PolytopeIntersector::Intersection intersection=*it;
>
> if(intersection.distance != intersection.distance) { //NaN
>
> //intersected object is behind the camera. Is this a bug?
>
> }
>
> }
>
> }
>
> …
>
>
>
>
>
> In my efforts to figure out what was going on I came across a possible
> clue. For all objects that are behind my camera, intersection.distance
> != intersection.distance (i.e. intersection.distance is NaN). For now I
> have worked around the issue by simply discarding results where this is
> the case but I am guessing this is a bug.
>
>
>
> Before I spend too much time stepping through the code to determine what
> is going wrong I want to make sure that this isn't the expected
> behaviour. Assuming this is a bug, can anyone who has worked with these
> classes before offer any suggestions that might help me track down the
> issue?
>
>
>
> Cheers,
>
> Brad
>
>
>
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