Hi,
I am having a lot of problems with picking with LineSegmentIntersector in
OSG 3.6.5.
I have reduced the problem to a a simple cube, center 0.5,0.5,0.5 with a
boundingSphere radius of 1.2142
I create the intersection with ( x , y are screen coordinates)
picker=new osgUtil::LineSegmentIntersector ( osgUtil::Intersector::WINDOW, x
, y );
osgUtil::IntersectionVisitor iv ( picker );
getCamera()->accept ( iv );
When I am "close" to the model geometry in an isometric view ( the cube
fills,say, 50% of the screen), this works perfectly. I get the exact
intersections coordinates I expect.
When I "pull the camera back" from the geometry and the object is much
smaller on the screen, the intersections fail.
After much debugging, the problem is that the intersector fails the test of
the intersection of the line with the bounding sphere of my model geometry
Specifically I send up in
bool LineSegmentIntersector::intersects(const osg::BoundingSphere& bs)
The BoundingSphere is in "model space" , and correct, but the _start and
_end points used in the calculation are incorrect to intersect the sphere
in model space and so the intersection fails.
_start {_v=0x000001ba7308d300 {13.227287349450325, -2.9785854231569449, -
5.5167534692525066} }
_end {_v=0x000001ba7308d318 {11.072576448741074, -5.1332963238661939, -
7.6714332827528793} }
Any ideas what is going on. It seems although the vector of start and end
is the correct vector ( or the "closer" picking would not work), something
is wrong in the transformation into model space.
Thx
Andrew
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