With the shift from the SNES to the next generation consoles, "Final Fantasy VII" became the first project in the series to use 3D computer graphics. Developers initially considered overlaying 2D sprites on 3D backgrounds but decided to forgo pixel art entirely in favor of polygonal models. Aside from the story, "Final Fantasy VI" had many details undecided when development began and most design elements were hashed out along the way. In contrast, with "Final Fantasy VII", the developers knew from the outset it was going to be "a real 3D game", so from the earliest planning stage, detailed designs were in existence. The script was also finalized, and the image for the graphics had been fleshed out. This meant that when actual development work began, storyboards for the game were already in place. The shift from cartridge ROM to CD-ROM posed some problems: according to lead programmer Ken Narita, the CD-ROM had a slower access speed, delaying some actions during the game, so the team needed to overcome this issue. Certain tricks were used to conceal load times, such as offering animations to keep players from getting bored. When it was decided to use 3D graphics, there was a discussion among the staff whether to use sprite-based character models or 3D polygonal models. While sprites proved more popular with the staff, the polygon models were chosen as they could better express emotion. This decision was influenced by the team's exposure to the 3D character models used in "Alone in the Dark". Sakaguchi decided to use deformed models for field navigation and real-time event scenes, for better expression of emotion, while realistically proportioned models would be used in battles. The team purchased Silicon Graphics Onyx supercomputers and related workstations, and accompanying software including Softimage 3D, PowerAnimator, and N-World for an estimated total of $21 million. Many team members had never seen 3D development technology before.