E.i. Dupont De Nemours and Company

Christian Voye

Paul Rupieper

Marc Chilla

Peter Minko

A process for the generation of a computer image of a coated, three-dimensional object involves applying at least a relevant coating layer on at least two test panels under the influence of a set of coating parameters which differs with respect to each panel; taking a plurality of measurements of at least one optical surface property as a function of the set of coating parameters selected on application of the relevant coating layer on each panel; storing the optical data in a datafile with assignment of the relevant set of coating parameters; facetting the visible surface(s) of a three-dimensional object by computer into a sufficient number of flat polygonal areas each being sufficiently small for the sufficiently accurate description of the surface topography; assigning the relevant set of coating parameters and associated optical data in each case to each individual polygonal area by computer; and assembling the polygonal areas into a computer image of the three-dimensional object.

Process for generating a computer image of a coated three-dimensional object

A process for generating a computer image of a three-dimensional object provided with a special-effect coating, involves coating a test panel with the coating, taking a plurality of angle-dependent colorimetric measurements of the coating; storing the calorimetric data in a datafile with assignment of the corresponding angles; facetting the visible surfaces of a three-dimensional object by computer into a sufficient number of flat polygonal areas each being sufficiently small for the sufficiently accurate description of the surface topography; assigning the colorimetric data to each individual polygonal area by computer as a function of the position of an observer and at least one illumination source; and assembling the polygonal areas into a computer image of a three-dimensional object with a visually perceptible special-effect coating thereon.

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Gevelsberg, Germany

Christian Voye