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A ''surface'' or ''triangle'' in Super Mario 64 is a piece of geometry that exerts some kind of force or effect on Mario. Every triangle falls into one of three categories: a floor triangle, a wall triangle, or a ceiling triangle. However, a triangle does not store what category it is. Instead, its category is determined based on the y component of the triangle's [[wikipedia:normal vector|normal vector]]. If y component > 0.01, then it is a floor. If y component < -0.01, then it is a ceiling. Otherwise, it is a wall<ref>https://www.youtube.com/watch?v=UnU7DJXiMAQ</ref>. | |||
==Walls== | ==Walls== | ||
[[File:Non-Vertical Wall.png|300px|right|thumb|This wall in [[BoB]] is not quite vertical.]] The majority of walls in the game are perfectly vertical, but not all. Walls that are not vertical are one cause of [[Glitchy Ledge Grab]]s. | [[File:Non-Vertical Wall.png|300px|right|thumb|This wall in [[BoB]] is not quite vertical.]] The majority of walls in the game are perfectly vertical, but not all. Walls that are not vertical are one cause of [[Glitchy Ledge Grab]]s. | ||