int[] stripCount = {17,17,5,5,5,5,5,5,5}; // ******
GeometryInfo gi = new GeometryInfo(GeometryInfo.POLYGON_ARRAY);
gi.setCoordinates(coordinateData);
gi.setStripCounts(stripCount);
gi.recomputeIndices();
NormalGenerator ng = new NormalGenerator();
ng.generateNormals(gi);
gi.recomputeIndices();