[JAVA3D] Scene appearance problem

[gaoming fu]

Hi, all

    I built polyhedrons using IndexedTriangleArray, the normal for each
vertex point is (0.0, -1.0, 0.0). I used the following code to set the
appearance:

PolygonAttributes pa = new PolygonAttributes();
                pa.setCullFace(PolygonAttributes.CULL_NONE);

                pa.setBackFaceNormalFlip(true);

                Appearance app = new Appearance();
                app.setPolygonAttributes(pa);


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