public boolean isChildNodeType(Node node) {
if (node.isAppearanceNode() || node.isGeometry3DNode()) return true;
else return false;
}
public Geometry3DNode getGeometry3D() {
for (Node node = getChildNodes(); node != null; node = node, next()) {
if (node.isGeometry3DNode()) return (Geometry3DNode) node;
}
return null;
}