Hello again! I've just realized i do need to be able to translate the starting and ending points of a LineSegmentIntersector created in WINDOW coordinate frame into the WORLD coordinate space.
is there any simple method to do so ? by retrieving them from the intersector or its intersection. i couldn't find any. my guess is to take matrices, make an inverse and multiply: Code: osg::Matrix matrix; matrix.preMult( somehow.getWindowMatrix() ); matrix.preMult( somehow.getProjectionMatrix() ); matrix.preMult( somehow.getViewMatrix() ); osg::Matrix inverse; inverse.invert(matrix); startPointInWorldCoordinates = startPoint * inverse; but this seems computation-wise lengthy and i am not sure how to get all these matrices ... maybe the window matrix from viewport and the other two from camera. but I see this is done in the lineSegmentIntersector, the matrices are retrieved from the visitor, yet neither the matrices, nor the points are stored. my second guess would be inheriting the LineSegmentIntersector itself and modify the descendant to store those translated points. I found out that having a wall (or any other object) close behind the projection pane (e.g. looking into a room from a corner or from a point close to the wall) is fine in the osg::viewer, but if i take the camera as the starting point of the rays, the rays end up hitting the wall, which is not actually seen. that's why i need to start the rays not from the camera, but from the projection pane and to do so i need to be able to translate the points on it into the WORLD coordinate space. Thank you for any pointers! Cheers, Andrey ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=46698#46698 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
