The algorithm can be implemented in object space or in image space method where aliasing may occur. The two methods used to solve the hidden surface problem are Image- Space Method and Object –Space Method. When objects are to be displayed with colour or shaded surface a surface is applied to rendering procedures to the visible surfaces so that the hidden surfaces are concealed.

Hidden surface algorithms employ image space approach such as depth buffer method, scan line method, depth sort method except Back face removal that is used when you do not render a polygon as it is pointing away from the viewer's eye point.