We concentrate on the method of representing and displaying surfaces of organs three-dimensionally from various digital imaging modalities. A process is described to perform this 3D representation and display by using Computer Vision modelling and Computer Graphics methods. Depending on the modelling function — which plays a keyrole — methods of segmentation, object surface- or object volume detection, visible surface determination, and rendering are discussed. A variety of these methods has been implemented in experimental systems, some of which are installed in a clinical environment.