private ModelClass edgeClass;
public void createModelClassesCompatibility(CompatibilityEngine engine) {
//NODE
nodeClass = new ModelClass(0, "NODE", true, true, true, false);
NodeSphereModeler modeler3d = new NodeSphereModeler(engine);
NodeDiskModeler modeler2d = new NodeDiskModeler(engine);
NodeRectangleModeler modelerRect = new NodeRectangleModeler(engine);
nodeClass.addModeler(modeler3d);
nodeClass.addModeler(modeler2d);
nodeClass.addModeler(modelerRect);