It is an object of this invention to provide apparatus and methods for electronically evaluating a pair of entities as candidates for co-location. Features are identified in a series of images generated by a camera system associated with the platform while the platform is moving. A first end of each model support structure is fastened to the basal structure and a second end of each model support structure is fastened to a respective model. The invention thus also concerns-a pastel-white, micro-particle and highly opaque rutile pigment attainable according to this method with reduced grinding-stable photo-activity and a grain size distribution of particle diameters ranging between 150 and 100 nm and with mono- or oligo-modal frequency distribution with a principal maximum of the distribution curve between 200 and 600 nm. Related methods are also discussed.