A method for sensing mechanical quantities such as force, stress, strain, pressure and acceleration is disclosed. Subroutines are modeled with control flow graphs and region trees having plural nodes related by edges that represent the hierarchical loop structure and construct relationship of statements. In the method, a polygon orientation of a polygon defining a face of a three-dimensional model is determined. Each of the plurality of tank sub-units is in fluid communication with a single fluid fill port. This provides digital data sets that are converted into suitable image composites and displayed on a screen by a multiplex method. The proteins of interest are functional, despite the existence of digestive enzymes.