{"id":81213,"date":"2011-06-12T18:05:36","date_gmt":"2011-06-13T00:05:36","guid":{"rendered":"http:\/\/horror.dreamdawn.com\/?p=81213"},"modified":"2011-06-12T18:05:36","modified_gmt":"2011-06-13T00:05:36","slug":"recursive-unlocking-analyzing-resident-evils-map-design-with-data-visualization","status":"publish","type":"post","link":"https:\/\/horror.dreamdawn.com\/?p=81213","title":{"rendered":"Recursive Unlocking: Analyzing Resident Evil’s Map Design with Data Visualization"},"content":{"rendered":"
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Resident Evil<\/a> is often credited with inventing the survival horror genre. While that particular accolade may not be entirely factual, the game is worthy of recognition for cementing horror as a viable, mass-market console genre. Critics are quick to point out that Resident Evil’s basic game system, consisting of static backgrounds, 3D characters, and character-centric pivot-and-move controls, were lifted almost entirely from Alone in the Dark.<\/i> Resident Evil, some will argue, might have taken the Dark formula and spruced it up for prime time, but it can hardly be credited with any great game design innovation.<\/p>\n

Though it’s true that Resident Evil used Alone in the Dark as its template, I think that critics who write the game off as a copycat are not paying enough attention. There is a wealth of interesting game design ideas in Resident Evil, and in this article I want to tackle one of them in particular: the design of the mansion map.<\/p>\n

It’s been a while since we all played Resident Evil, so let me refresh your memory. At the beginning of the game the protagonists find themselves locked in the sinister Spencer Mansion, which is also home to lots of zombies and (as we eventually find) a large underground secret laboratory. As the game starts there are only a few rooms that are accessible–access to most of the mansion is sealed behind locked doors, secret panels, and powered-down elevators. As the player progresses through the mansion he finds keys that unlock doors in areas he’s already visited, and must eventually return to those areas to find more keys to unlock new areas of the structure. Thus the player travels through the map in a very non-linear fashion, moving back and forth between rooms as items are collected and puzzles are solved, and eventually passing into areas with entirely new rooms. The map opens itself up like a spiral shell. I call this design Recursive Unlocking.<\/i><\/p>\n

This approach has interested me for a long time. The genius part of the Resident Evil level design is that in the course of playing through the game two things happen: the player unlocks shortcuts and the player runs out of ammo. At some point the game becomes entirely about traversing efficiently through the mansion; it’s a run from the safe room (where we can save) through the shortest possible set of rooms until we reach another safe room or a new puzzle to solve. There’s simply not enough ammo to dispatch all of the zombies in the game, so route planning and deftly maneuvering through the Victorian building is eventually the key source of challenge.<\/p>\n

Though the Recursive Unlocking pattern is interesting, I’ve struggled with how to study it. The actual order in which rooms are accessed has a lot to do with the player himself; most of the time there are two or three puzzles that are in the process of being solved simultaneously, and the level of traversal efficiency can depend on the order in which these puzzles are attempted. That said, there’s clearly a method behind the design of Spencer Mansion and its surrounding areas. The brains behind this game carefully architected the map so that the player’s traversal through the mansion would occur at a pace that they could control. To understand how the Recursive Unlocking methodology works, it would help to understand how the space was designed in the first place. Since we can’t just call up Shinji Mikami, Hideki Kamiya, and the rest of the (large) design team, I turned to the next best thing: data mining and visualization.<\/p>\n

Methodology<\/h3>\n

When designing a game we can assume that the level designer thinks in terms of the fastest path through the space. If several goals must be completed before the next space is unlocked, the level designer knows the most efficient order in which to complete them. He’s likely to lay the main path out first, then go back and flesh it out with extra details, secondary goals, or side-paths. Therefore, if we look at a highly efficient traversal of the space that doesn’t rely on bugs or tricks, we should be able to get a rough approximation of how the level was put together originally.<\/p>\n

What I did is take a video of a speed run of Resident Evil: Director’s Cut (using Jill, on Arrange Mode, with 100% completion) and trace the player’s path through the game. I recorded each room transition in order, along with a time stamp, to produce a mapping of the speed runner’s entire path through the game. Then I wrote some code to render this path over a 2D map of the whole game using Processing. Finally, I took all the data I had, threw it into a spreadsheet, and made some graphs.<\/p>\n

The results are pretty interesting. The speed runner takes the most efficient path possible through the game; no time is wasted with story or items. The only rooms visited are those that are necessary to progress to the end of the game. Since this is Arrange Mode, the actual details of the traversal might differ slightly from the original Resident Evil, but even so the main arc of the game, the way that the player moves from one part of the mansion to another, is clearly visible and worthy of analysis.<\/p>\n

Visualizing Recursive Unlocking<\/h3>\n

Here’s a visualization of the most efficient path through Resident Evil 1.<\/p>\n

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