Systems and a method for calculating thickness values of a coating material applied by a coating gun on object surfaces in industrial processes include measuring, on real test surfaces, the thickness values of coating material samples applied by the coating gun on the real test surfaces. The measured thickness values are used to generate 3D virtual objects modeling the coating dispersions of the coating gun at given angles formed between the coating gun and the test surface. The thickness values of the coating material applied on the surface of a simulated object by a simulated gun at a certain angle are calculated by detecting the collision between the 3D virtual object mounted on the simulated coating gun and surface elements of the simulated object surface.