import com.sun.j3d.utils.geometry.GeometryInfo;
import com.sun.j3d.utils.geometry.NormalGenerator;
import com.sun.j3d.utils.geometry.Stripifier;
import com.sun.j3d.utils.geometry.Triangulator;

GeometryInfo gi = new GeometryInfo( GeometryInfo.POLYGON_ARRAY );
int strips = vertexCount/4;
int stripRemain = vertexCount%strips;
int stripCount[] = new int[strips+1];
for ( int i=0; i < stripCount.length; i++ )
    stripCount[i] = 4;
stripCount[stripCount.length-1] = stripRemain;

gi.setCoordinates( gridPoints );
gi.setStripCounts( stripCount );

Triangulator tr = new Triangulator();
tr.triangulate(gi);
gi.recomputeIndices();

NormalGenerator ng = new NormalGenerator();
ng.generateNormals(gi);
gi.recomputeIndices();

Stripifier st = new Stripifier();
st.stripify(gi);
gi.recomputeIndices();

// Wireframe look
Appearance look = new Appearance();
PolygonAttributes polyAttrib = new PolygonAttributes();
polyAttrib.setPolygonMode( PolygonAttributes.POLYGON_LINE );
look.setPolygonAttributes( polyAttrib );
ColoringAttributes colorAttrib = new ColoringAttributes();
colorAttrib.setColor( 0.5f, 0.5f, 0.5f );
look.setColoringAttributes( colorAttrib );
testShape.setAppearance( look );

testGeom = gi.getGeometryArray();
testShape.setGeometry( testGeom );

TransformGroup xfGroup = new TransformGroup();
xfGroup.addChild(testShape);
testGroup.addChild(xfGroup);

// sceneRoot.setCapability( Group.ALLOW_CHILDREN_EXTEND );
sceneRoot.addChild( testGroup );