2009/5/22 Simon Hammett <[email protected]>: > 2009/5/22 Paul Griffiths <[email protected]>: >> Im clipping an osg::group with an osg::ClipNode so parts of it is invisible >> on screen but when i click on the invisible parts the picker is still >> picking the object . i dont want it like that, i want the invisible parts to >> be invisible to the mouse as well. so i wish to create an aabb around the >> parent picked node the same size and position as the clipNode and check if >> getWorldIntersectPoint is within this aabb. >> >> if there is a way to check if getWorldIntersectPoint is outside a clipnodes >> assigned bounding box then that would be even better. >> >> >> It's for a scrollpanel for my new 3d gui system. >> > > If you have a clip node in world coordinates, you can just test the > world intersect point against that. > > for each clip plane in the clip node, call getClipPlane, > > this gives you a vec4d which is the plane equation. > calc the distance from the plane and if it's negative it's outside. > > distance is pt.x() * pl.x() + pt.y() * pl.y() + pt.z() * pl.z() + pl.w() > where pt is the intersection point > and pl is the vec4 of the plane > > -- > http://www.ssTk.co.uk >
It's also worth noting, that the LineSegmentIntersector::Intersection result has a nodePath member which is the trace from the top of the scene graph to that node. This can be used with the functions in osg/Transform to give you various useful matrices. -- http://www.ssTk.co.uk _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
