Hi,
could you please send the complete file to osg-submissions.
See here
http://www.openscenegraph.org/projects/osg/wiki/MailingLists/SubmissionsProtocol
jp
Tanguy Fautre wrote:
Hi,
I think I found the bug. Fixed implementation attached.
If you look at the implementation of the function
osgViewer::View::computeIntersections() taking the nodepath argument, you'll
see that it compute the LocalToWorld transformation using the complete given
path.
But this is incorrect if the last node of the path is a transformation. In
which case the last transformation is applied twice before computing any
intersections.
I've currently copy/pasted the current implementation and changed it to a
standalone function so that I could test and use it as a fixed version without
modifying OSG code. See attachment.
The two important lines are:
const osg::NodePath shortPath(nodePath.begin(), nodePath.end() - 1);
osg::Matrix matrix = osg::computeLocalToWorld(shortPath) *
camera->getViewMatrix() * camera->getProjectionMatrix();
Robert, if you agree with these modifications, what should I do for them to be
integrated back into the trunk?
Cheers,
Tanguy
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Tanguy Fautre
Sent: Friday 28 November 2008 15:21
To: osg-users@lists.openscenegraph.org
Cc: Neil Groves
Subject: Spam: [osg-users] View::computeIntersections with a node path
Hi,
Has anyone been able to successfully use
osgViewer::View::computeIntersections() taking a node path argument on a
non-trivial scenegraph?
I currently have a fairly complex scenegraph, but I only want a small
part of it to collide with computeIntersections. When I use
computeIntersections without the nodepath, everything works perfectly.
But as soon as I use the overload with the node path, I get an empty
intersection set. I'm pretty sure the node path I'm giving is correct.
Looking at the implementation of computeIntersections() with the node
path, the only thing that puzzles me is the use of
osg::computeWorldToLocal(nodePath) before computing the matrix inverse,
I'm not sure I fully understand why this is the case. It seems to me the
whole operation should be LocalToWorldMatrix * ViewMatrix *
ProjectionMatrix instead.
In any case, if anyone has a working example (which would show
computeIntersections() with a node path is working correctly, or help
finding the mistake I'm doing), it would be appreciated.
Regards,
Tanguy
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