[JAVA3D] What triggered invert() or caused SingularMatrixException?

[Jasmine Kwok]

Hi All,   I've been getting the SingularMatrixException but according to the API, it is thrown in the invert method, which I did not call in my codes. What other methods could have invoked the method or cause the exception?   I have been using TransformGroup and Transform3D, scale and translate, etc, but I have no idea what is the root of the problem. I need to catch the exception but where shld it be?   --------------------------------------------- javax.vecmath.SingularMatrixException: cannot invert matrix  at javax.media.j3d.Transform3D.invertAffine(Transform3D.java:2831)  at javax.media.j3d.Transform3D.invert(Transform3D.java:2687)  at javax.media.j3d.RenderBin.updateObject(RenderBin.java:790)  at javax.media.j3d.MasterControl.updateMirrorObjects(MasterControl.java:2652)  at javax.media.j3d.MasterControl.runMonitor(MasterControl.java:3357)  at javax.media.j3d.MasterControl.doWork(MasterControl.java:2909)  at javax.media.j3d.MasterControlThread.run(MasterControlThread.java:28) ----------------------------------------------