The advantage of pre-rendering is the ability to use graphic models that are more complex and computationally intensive than those that can be rendered in real-time, due to the possibility of using multiple computers over extended periods of time to render the end results. For instance, a comparison could be drawn between rail-shooters "Maximum Force" (which used pre-rendered 3D levels but 2D sprites for enemies) and "Virtua Cop" (using 3D polygons); "Maximum Force" was more realistic looking due to the limitations of "Virtua Cop's" 3D engine, but "Virtua Cop" has actual depth (able to portray enemies close and far away, along with body-specific hits and multiple hits) compared to the limits of the 2D sprite enemies in "Maximum Force".