[JAVA3D] More Transform3D errors ("cannot invert matrix")

[Tachio Terauchi]

Hi,

Previously, I was getting non-orthogonal/non-congruent exceptions.  Now, I
am getting "cannot invert matrix" exception.  Like my previous exceptions,
this seems to occur randomly.  My program is a VR viewer that uses 6DOF
headtracker.  Here's the exception message I get from java:

javax.vecmath.SingularMatrixException: cannot invert matrix
        at javax.media.j3d.Transform3D.invertGeneral(Compiled Code)
        at javax.media.j3d.Transform3D.invert(Compiled Code)
        at javax.media.j3d.CanvasViewCache.computeFrustumPlanes(Compiled
Code)
        at javax.media.j3d.CanvasViewCache.computeView(Compiled Code)
        at javax.media.j3d.CanvasViewCache.computeDerivedData(Compiled
Code)
        at javax.media.j3d.Canvas3D.updateViewCache(Compiled Code)
        at javax.media.j3d.Renderer.run(Compiled Code)

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