public Shape3D getGrid(){
            int numIndexes = 4;
            int[] indexes = new int[]{0,1,2,3};
            // Vector3f[] normals = new Vector3f[]{ new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f)};
            
            IndexedQuadArray a = new IndexedQuadArray(4,IndexedTriangleArray.COORDINATES,numIndexes);
            
            Point3f[] coords = new Point3f[]{ new Point3f(1.0f,1.0f,0.0f), new Point3f(-1.0f,1.0f,0.0f),new Point3f(-1.0f,-1.0f,0.0f),new Point3f(1.0f,-1.0f,0.0f)};
      
            a.setValidIndexCount(4);
            a.setCoordinates(0,coords);
            //a.setNormals(0,normals);
            a.setIndex(indexes);
            
            Appearance app = new Appearance();
          Material material = new Material();
          material.setAmbientColor(.6f,.6f,.6f);
          material.setLightingEnable(true);

            app.setColoringAttributes(new ColoringAttributes(new Color3f(1.0f,0.0f,0.0f),ColoringAttributes.FASTEST));
            app.setPolygonAttributes(new PolygonAttributes(PolygonAttributes.POLYGON_LINE,PolygonAttributes.CULL_NONE,0f));
            // app.setMaterial(material);
            
            Shape3D s = new Shape3D(a,app);
            return s;
      }

      public Shape3D getTriangle(){
            int numIndexes = 3;
            int[] indexes = new int[]{0,1,2};
            // Vector3f[] normals = new Vector3f[]{ new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f),new Vector3f(0.0f,0.0f,1.0f)};
            
            IndexedTriangleArray a = new IndexedTriangleArray(3,IndexedTriangleArray.COORDINATES,numIndexes);
            
            Point3f[] coords = new Point3f[]{ new Point3f(1.0f,1.0f,0.0f), new Point3f(-1.0f,1.0f,0.0f),new Point3f(-1.0f,-1.0f,0.0f)};
      
            a.setValidIndexCount(3);
            a.setCoordinates(0,coords);
            //a.setNormals(0,normals);
            a.setIndex(indexes);
            
            Appearance app = new Appearance();
          Material material = new Material();
          material.setAmbientColor(.6f,.6f,.6f);
          material.setLightingEnable(true);

            app.setColoringAttributes(new ColoringAttributes(new Color3f(1.0f,0.0f,0.0f),ColoringAttributes.FASTEST));
            app.setPolygonAttributes(new PolygonAttributes(PolygonAttributes.POLYGON_LINE,PolygonAttributes.CULL_NONE,0f));
            // app.setMaterial(material);
            
            Shape3D s = new Shape3D(a,app);
            return s;
      }