1. A method of editing a dual model of physical geological structures using a pair of twin three-dimensional (3D) volume painters, the method comprising: accepting geological data; generating a dual model comprising a 3D present day model having points representing present locations of the physical geological structures and a 3D past depositional model having points representing locations where the physical geological structures were computed to be originally deposited; generating a pair of twin 3D volume painters comprising one present day painter volume located in the 3D present day model and another past depositional painter volume located in the 3D past depositional model; editing the dual model such that when the present day painter volume is moved or used in the 3D present day model, a simultaneous and corresponding movement or usage is executed in the 3D past depositional model, and vice versa; and displaying the edited dual model.