Surface - Revision history

TheLonelyPoire: Minor cleanup of page - improved descriptions of the inequalities, added a couple references, and made small improvements to the text.

2025-08-05T08:19:26Z

Minor cleanup of page - improved descriptions of the inequalities, added a couple references, and made small improvements to the text.

← Older revision		Revision as of 08:19, 5 August 2025
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	{{stub}}		{{stub}}
	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.		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 the y-component of the surface normal is greater than 0.01, then the surface is considered a floor. If the y-component is less than -0.01, then the surface is considered a ceiling. Otherwise, the surface is considered a wall.<ref>[https://github.com/n64decomp/sm64/blob/9921382a68bb0c865e5e45eb594d9c64db59b1af/src/engine/surface_load.c#L105 SM64 Decompilation Project - Surface Loading]</ref>
	==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.
	===Hitbox===		===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]]		[[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 initial handle and the single frame movement, simplified]]
	All wall hitboxes are handled once per [[frame]] and once per [[Quarter Steps\|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.		All wall hitboxes are handled once per [[frame]] and once per [[Quarter Steps\|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 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 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.		*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.		*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===		=== 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==
	A floor triangle is a triangle with normal.y > 0.01.		A floor triangle is a triangle with normal.y > 0.01.
	===Hitbox===		===Hitbox ===
	A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state. When walking on a slope, Mario will move horizontally at a rate slower than his actual speed, known as his [[De Facto Speed]].		A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state. When walking on a slope, Mario will move horizontally at a rate slower than his actual speed, known as his [[De Facto Speed]].

	Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.		Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.
	==Ceilings==		==Ceilings==
			A ceiling triangle is a triangle with normal.y < 0.01.

			===Hitbox===
	A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, meaning that its hitbox will stop right when the floor hitbox starts.		A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, meaning that its hitbox will stop right when the floor hitbox starts.

	On the American release of the game, there is an interesting ceiling example found in [[Rainbow Ride]], where [https://youtu.be/UnU7DJXiMAQ?t=1466 the top of the chimney is not capped off], making the ceiling go up forever, softlocking Mario if he ends up sliding into it.		On the American release of the game, there is an interesting ceiling example found in [[Rainbow Ride]], where [https://youtu.be/UnU7DJXiMAQ?t=1466 the top of the chimney is not capped off], making the ceiling go up forever, softlocking Mario if he ends up sliding into it.

			=== Ceiling Movement===
	Even though ceilings try to push Mario outwards, they can still be accessed using various techniques, such as getting pushed by an enemy. Note that once Mario is standing inside the ceiling, he is no longer able to move anywhere due to his quarter steps being cancelled.		Even though ceilings try to push Mario outwards, they can still be accessed using various techniques, such as getting pushed by an enemy. Note that once Mario is standing inside the ceiling, he is no longer able to move anywhere due to his quarter steps being cancelled.

	For ~~Water~~ movement, Mario instead gets warped downward by ceilings. These downwarps are used in various TASes and speedruns.		For water movement, Mario instead gets warped downward by ceilings. These downwarps are used in various TASes<ref>[https://youtu.be/tAwienu67cU?si=Uf2Fh3mMcA2HXzUh&t=320 JRB Treasure of the Ocean Cave 0.5xA]</ref> and speedruns.
	==Surface Types==		==Surface Types==
	While the surface type of a surface is not restricted to only floors, walls, or ceilings, in practice they are only used in certain scenarios, or wouldn't have any affect if such surface was of a different type, i.e. there could be a vertical wind ceiling or a death barrier wall, but those surfaces would have the behaviour. Todo: Explain what slipperiness means.		While the surface type of a surface is not restricted to only floors, walls, or ceilings, in practice they are only used in certain scenarios, or wouldn't have any affect if such surface was of a different type, i.e. there could be a vertical wind ceiling or a death barrier wall, but those surfaces would have the behaviour. Todo: Explain what slipperiness means.

Icecream17: /* Surface Types */ explain surface types

2023-02-26T01:38:17Z

Surface Types: explain surface types

← Older revision		Revision as of 01:38, 26 February 2023
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	==Floors==		==Floors==
	A floor triangle is a triangle with normal.y > 0.01.		A floor triangle is a triangle with normal.y > 0.01.

	===Hitbox===		===Hitbox===
	A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state. When walking on a slope, Mario will move horizontally at a rate slower than his actual speed, known as his [[De Facto Speed]].		A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state. When walking on a slope, Mario will move horizontally at a rate slower than his actual speed, known as his [[De Facto Speed]].

	Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.		Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.

	==Ceilings==		==Ceilings==
	A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, meaning that its hitbox will stop right when the floor hitbox starts.		A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, meaning that its hitbox will stop right when the floor hitbox starts.
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	For Water movement, Mario instead gets warped downward by ceilings. These downwarps are used in various TASes and speedruns.		For Water movement, Mario instead gets warped downward by ceilings. These downwarps are used in various TASes and speedruns.

	==Surface Types==		==Surface Types==
	Todo: Explain what slipperiness means.		While the surface type of a surface is not restricted to only floors, walls, or ceilings, in practice they are only used in certain scenarios, or wouldn't have any affect if such surface was of a different type, i.e. there could be a vertical wind ceiling or a death barrier wall, but those surfaces would have the behaviour. Todo: Explain what slipperiness means.
	{{Surface_Types}}		{{Surface_Types}}
	==References==		==References==
	<references />		<references />
	[[Category:Mechanics]]		[[Category:Mechanics]]

Macrepeh at 15:50, 23 December 2020

2020-12-23T15:50:53Z

← Older revision		Revision as of 15:50, 23 December 2020
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	==Surface Types==		==Surface Types==
			Todo: Explain what slipperiness means.
	{{Surface_Types}}		{{Surface_Types}}
	==References==		==References==
	<references />		<references />
			[[Category:Mechanics]]

InfoManiac742: /* Ceilings */ Fixed spelling and grammar

2020-09-28T21:56:53Z

Ceilings: Fixed spelling and grammar

← Older revision		Revision as of 21:56, 28 September 2020
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	==Ceilings==		==Ceilings==
	A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, ~~maning~~ that its hitbox will stop right when the floor hitbox starts.		A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, meaning that its hitbox will stop right when the floor hitbox starts.

	On the ~~american~~ release of the game, there is an interesting ceiling example found in [[Rainbow Ride]], where [https://youtu.be/UnU7DJXiMAQ?t=1466 the top of the ~~chimeney~~ is not capped off], making the ceiling go up forever, softlocking Mario if he ends up sliding into it.		On the American release of the game, there is an interesting ceiling example found in [[Rainbow Ride]], where [https://youtu.be/UnU7DJXiMAQ?t=1466 the top of the chimney is not capped off], making the ceiling go up forever, softlocking Mario if he ends up sliding into it.

	Even though ceilings try to push Mario outwards, they can still be accessed using various techniques, such as getting pushed by an enemy. Note that once Mario is standing inside the ceiling, he is no longer able to move anywhere due to his quarter steps being cancelled.		Even though ceilings try to push Mario outwards, they can still be accessed using various techniques, such as getting pushed by an enemy. Note that once Mario is standing inside the ceiling, he is no longer able to move anywhere due to his quarter steps being cancelled.

HiLlBiLlYjOeL: Fixed Quarter Step link

2020-05-20T16:23:54Z

Fixed Quarter Step link

← Older revision		Revision as of 16:23, 20 May 2020
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	===Hitbox===		===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]]		[[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.		All wall hitboxes are handled once per [[frame]] and once per [[Quarter Steps\|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 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 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.

SuperM789: /* Ceilings */

2020-03-11T03:31:49Z

Ceilings

← Older revision		Revision as of 03:31, 11 March 2020
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	==Ceilings==		==Ceilings==
			A ceiling hitbox extends from 160 units below the ceiling to infinitely above. For ground and air movement, the ceiling will try its best to keep Mario out of it. If Mario walks into the ceiling, his quarter step will be canceled, and he will remain in place and do the pushing animation. If Mario is moving upwards in the air when coming in contact with the ceiling, his quarter step will be canceled and his vertical speed will be set to 0. On the contrary, when Mario falls onto a ceiling while airborne, his quarter step will be canceled and his horizontal speed will get set to 0, making him fall straight down. Although a ceiling will extend upwards infinitely, a floor can overwrite the ceiling hitbox, maning that its hitbox will stop right when the floor hitbox starts.

			On the american release of the game, there is an interesting ceiling example found in [[Rainbow Ride]], where [https://youtu.be/UnU7DJXiMAQ?t=1466 the top of the chimeney is not capped off], making the ceiling go up forever, softlocking Mario if he ends up sliding into it.

			Even though ceilings try to push Mario outwards, they can still be accessed using various techniques, such as getting pushed by an enemy. Note that once Mario is standing inside the ceiling, he is no longer able to move anywhere due to his quarter steps being cancelled.

			For Water movement, Mario instead gets warped downward by ceilings. These downwarps are used in various TASes and speedruns.

	==Surface Types==		==Surface Types==
	{{Surface_Types}}		{{Surface_Types}}
	==References==		==References==
	<references />		<references />

MariaNicolae: Added mention of de Facto Speed to floors

2019-11-23T23:06:44Z

Added mention of de Facto Speed to floors

← Older revision		Revision as of 23:06, 23 November 2019
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	===Hitbox===		===Hitbox===
	A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state.		A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state. When walking on a slope, Mario will move horizontally at a rate slower than his actual speed, known as his [[De Facto Speed]].

	Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.		Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.

MariaNicolae: Added explanation for floors

2019-11-23T23:03:23Z

Added explanation for floors

← Older revision		Revision as of 23:03, 23 November 2019
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	[[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==
			A floor triangle is a triangle with normal.y > 0.01.

			===Hitbox===
			A floor's hitbox extends 78 units below and 100 units above the floor triangle. This allows Mario to move vertically along floors; if he is moving up or down a slope or stairs, he will be off the floor after his horizontal motion but still in its hitbox, which will snap him to the floor. He will always be snapped up if he's in a floor's hitbox below the floor, but he'll only be snapped down while above a floor if he is in a ground movement state.

			Any location that is not inside or above a floor hitbox is considered out of bounds; Mario will not be able to move into it of his own volition, and if forced into it, he will die.

	==Ceilings==		==Ceilings==
	==Surface Types==		==Surface Types==

JoshDuMan: Uh, this doesn't look right but seems it would take significant work to improve rn

2019-05-09T14:58:03Z

Uh, this doesn't look right but seems it would take significant work to improve rn

← Older revision		Revision as of 14:58, 9 May 2019
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	==Floors==		==Floors==
	==Ceilings==		==Ceilings==
			==Surface Types==
			{{Surface_Types}}
	==References==		==References==
	<references />		<references />

ChouxZi3: added more information to reference

2019-03-24T07:12:49Z

added more information to reference

← Older revision		Revision as of 07:12, 24 March 2019
Line 1:		Line 1:
	{{stub}}		{{stub}}
	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.