[JAVA3D] two questions about picking

[A. Murat Tanyer]

Hi all,   I have two small questions about picking:   1) I created my own classes for picking. The below lines create a ray and select object/s from the scene:     //BranchGroup objRoot   PickRay ray = createPickRay(canvas, x, y);   SceneGraphPath[] path = objRoot.pickAll(ray);    private PickRay createPickRay(Canvas3D canvas, int x, int y)  {   Point3d eye_pos = new Point3d();   Point3d mouse_pos = new Point3d();   canvas.getCenterEyeInImagePlate(eye_pos);   canvas.getPixelLocationInImagePlate(x, y, mouse_pos);   Transform3D motion = new Transform3D();   canvas.getImagePlateToVworld(motion);   motion.transform(eye_pos);   motion.transform(mouse_pos);   Vector3d direction = new Vector3d(mouse_pos);   direction.sub(eye_pos);   return new PickRay(eye_pos, direction);  }     The problem is that if there are two objects behind one PickRay selects all of them. How can I select the closest one? I replace the pickAll(ray) method with pickClosest(ray). But I am getting the below error message.     c:\book\MousePickBehaviour.java:82: incompatible types found   : javax.media.j3d.SceneGraphPath required: javax.media.j3d.SceneGraphPath[] SceneGraphPath[] path = ModelClipTest.IFCRoot.pickClosest(ray);                                                                         ^ 1 error 2) Secondly, how can I pick the objects within a window created a window created by mouse? Now I can get the clicked point on the canvas and select single object? How can I proceed to select with mouse windows?   Thanks Murat