Provided is a self-cleaning substrate system. A sand blast apparatus having a vibratory bowl with a throttled intake pipe enables small blast media particles to be used to prepare the substrate surface with the formed pockets. The control means copies the program read out thereby and afterwards executes the program. Further, the computer readable program when executed on a computer causes the computer to create a component in a component tier that is defined in the topology pattern such that the component corresponds to the topology role. The computed current trace bounding contour is then compared with the computed current selection bounding contour.