fix center object after resize
fix center object after resize

cnr-isti-vclab/meshlabjs,cignoni/meshlabjs,cnr-isti-vclab/meshlabjs,cignoni/meshlabjs,cignoni/meshlabjs,cignoni/meshlabjs,cnr-isti-vclab/meshlabjs,cnr-isti-vclab/meshlabjs,cignoni/meshlabjs,cnr-isti-vclab/meshlabjs