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Surface: Difference between revisions
wall hitbox stuff
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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 | 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. | ||
==Walls== | ==Walls== | ||
A triangle is a wall triangle if and only if -0.01 < normal.y < 0.01. | |||
===Hitbox=== | |||
[[File:wall hitbox.png|300px|right|thumb|The hitbox of a wall during both the initial handle and a ground quarter step, simplified]][[File:wall hitbox air.png|300px|right|thumb|The hitbox of a wall during an air quarter step, simplified]][[File:wall hitbox water.png|300px|right|thumb|The hitbox of a wall in the water, including both the inital handle and the single frame movement, simplified]] | |||
All wall hitboxes are handled once per [[frame]] and once per [[Quarter Step|quarter step]] of Mario's movement. Most of the time, a wall has two separate hitboxes handled one after the other within a frame or quarter step. | |||
* A wall hitbox's initial frame handle has a hitbox extending 50 [[unit]]s forward and 50 units backward, offset down 60, and then a hitbox extending 24 units in each direction offset down 30. | |||
* A quarter step of ground movement has a hitbox extending 24 [[unit]]s forward and 24 units backward, offset down 30, and then a hitbox extending 50 units in each direction offset down 60. This is the opposite order from the initial handle, but the outcome is the same. | |||
* A quarter step of air movement gives the wall a hitbox of 50 units in each direction offset down 150, and then a hitbox of 50 units offset down 30. | |||
* Water movement does not implement quarter steps. After one frame of water movement, a wall hitbox extends 110 units in each direction, offset down 10. Since both the water handle and the initial handle both happen once per frame, the hitboxes can be overlaid. | |||
===Non-vertical 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. | ||
==Floors== | ==Floors== | ||
==Ceilings== | ==Ceilings== | ||
==References== | ==References== | ||
<references /> | <references /> | ||