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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]]<ref>https://www.youtube.com/watch?v=UnU7DJXiMAQ</ref>. 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. | 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]]<ref>[https://www.youtube.com/watch?v=UnU7DJXiMAQ "Walls, Floors, & Ceilings" by UncommentatedPannen]</ref>. 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. | ||
==Walls== | ==Walls== | ||
A triangle is a wall triangle if and only if -0.01 < normal.y < 0.01. | A triangle is a wall triangle if and only if -0.01 < normal.y < 0.01. | ||