blah.java

                            ModelBlockDefinition.Variant v = iter.next();
                            Class clazz = Class.forName("net.minecraftforge.client.model.BlockStateLoader$ForgeVariant");
                            if (clazz.isInstance(v))
//                            if (v instanceof BlockStateLoader.ForgeVariant)
                            {
                                
//                                BlockStateLoader.ForgeVariant forgeV = (ForgeVariant) v;
                                IModelState state = forgeV.getState();
                                //?
                            }