Given a 2D cursor position from a mouse event, how do I compute a 3D ray into the scene?
This is my attempt so far but it's not giving sensible results: Code: float width = viewer->getCamera()->getViewport()->width(); float height = viewer->getCamera()->getViewport()->width(); float x = (2.0f * ea.getX()) / width - 1.0f; float y = 1.0f - (2.0f * ea.getY()) / height; float z = 1.0f; osg::Vec3 ray_nds(x, y, z); osg::Vec4 ray_clip(ray_nds.x(), ray_nds.y(), -1.0, 1.0); osg::Matrixd proj_inv = viewer->getCamera()->getProjectionMatrix(); proj_inv = proj_inv.inverse(proj_inv); osg::Vec4 ray_eye = proj_inv * ray_clip; ray_eye.z() = -1.0; ray_eye.w() = 0.0; osg::Vec4 ray_wor4 = viewer->getCamera()->getInverseViewMatrix() * ray_eye; osg::Vec3 ray_wor(ray_wor4.x(), ray_wor4.y(), ray_wor4.z()); P.S: I need such a ray so I can drag a 3D object around the scene like this: new_position = camera_position + ray_direction * depth_value; Or is there an easier way to accomplish this? Thanks [/code] ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=74349#74349 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
