3DMidTex tutorial - Revision history

Printz at 13:54, 14 June 2026

2026-06-14T13:54:55Z

← Older revision		Revision as of 09:54, 14 June 2026
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	Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.		Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.

			=== Wrap-midtex ===
			If the UDMF '''wrapmidtex''' or ExtraData '''WRAPMIDTEX''' flag is set, the texture will visually continue by the entire height of the area, and as such, the 3DMidTex blocking will also cover the entire area.

	==See also==		==See also==

Printz: /* See also */

2019-07-24T06:03:56Z

Printz: /* See also */

2019-07-24T06:03:24Z

Printz at 05:59, 24 July 2019

2019-07-24T05:59:26Z

← Older revision		Revision as of 01:59, 24 July 2019
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	Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.		Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.

			==See also==
			*[[Linked portal]]

	[[Category:Tutorials]]		[[Category:Tutorials]]

78.114.21.102: /* Monsters crossing */ sp

2010-04-12T11:09:56Z

Monsters crossing: sp

← Older revision		Revision as of 07:09, 12 April 2010
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	Because of the way monster AI in Doom works, it can be VERY tricky to get monsters to cross a 3D bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line, because the engine assumes there is nothing on the other side for the monster to step on. Here are some tips to help you overcome this.		Because of the way monster AI in Doom works, it can be VERY tricky to get monsters to cross a 3D bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line, because the engine assumes there is nothing on the other side for the monster to step on. Here are some tips to help you overcome this.

	When a monster comes in contact with a 3DMidTex line that it can stand on (i.e., is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to ensure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3DMidTex line inside the ~~nitch~~ you just created.		When a monster comes in contact with a 3DMidTex line that it can stand on (i.e., is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to ensure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3DMidTex line inside the niche you just created.

	[[Image:3dmidtex_tut4.jpg]]		[[Image:3dmidtex_tut4.jpg]]

SoM: /* Clipping */

2006-01-07T04:53:27Z

Clipping

← Older revision		Revision as of 00:53, 7 January 2006
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	=== Clipping ===		=== Clipping ===

	It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is.		It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is. 3DMidTex lines will only block objects and not bullets. So a 3DMidTex will stop a rocket but not a shotgun blast.

	Also, please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture~~. This would have required too much processing power to accomplish~~.		Also, please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture.

	=== Monsters crossing ===		=== Monsters crossing ===

Bloodshedder: grammar and stuff

2006-01-06T04:39:21Z

grammar and stuff

← Older revision		Revision as of 00:39, 6 January 2006
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	== Your first 3D bridge ==		== Your first 3D bridge ==

	For the purposes of this tutorial, I'll assume you are familiar with Doom editing and your level editor, and with the use of middle textures. You will need to use an editor that either A. has support for Eternity features (IE. ~~DoomBuilder~~) or an editor that allows you to manually change the flags value for linedefs. ~~I use DoomBuilder, you should too ;)~~		For the purposes of this tutorial, I'll assume you are familiar with Doom editing and your level editor, and with the use of middle textures. You will need to use an editor that either has support for Eternity features (e.g. [[Doom wiki:Doom Builder\|Doom Builder]]) or an editor that allows you to manually change the flags value for linedefs.

	First, open up a new ~~Doom2~~ level for editing, create a simple room with a pit running through it.		First, open up a new Doom 2 level for editing, and create a simple room with a pit running through it.

	[[Image:3dmidtex_tut1.jpg]]		[[Image:3dmidtex_tut1.jpg]]
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	(I added cool, ultra-hurty lava to mine)		(I added cool, ultra-hurty lava to mine)

	Now you need to create the structure the player will eventually be able to cross to get to safety. Again, I assume you know how to create two sided lines and ~~put~~ middle textures in them.		Now you need to create the structure the player will eventually be able to cross to get to safety. Again, I assume you know how to create two sided lines and place and align middle textures in them.

	[[Image:3dmidtex_tut2.jpg]]		[[Image:3dmidtex_tut2.jpg]]

	~~So if~~ you run this map, the player obviously falls down through your ~~middletexture~~ bridge. So we perform the final step: setting the lindef flag. ~~Now the~~ flag is 1024 (0x400 in HEX) so if you are editing the flags yourself just add 1024 to your flag value, if you are using ~~Doombuilder~~, and you don't see the lindef flag called "3dMidTex", press F2 and make sure you are editing your map as an Eternity map. Once your flags are set for your linedefs, run the map and the player should now be able to cross the bridge as if the middle textures were solid objects.		If you run this map, the player obviously falls down through your middle texture bridge. So we perform the final step: setting the lindef flag. The flag is 1024 (0x400 in HEX), so if you are editing the flags yourself, just add 1024 to your flag value; if you are using Doom Builder, and you don't see the lindef flag called "3dMidTex", press F2 and make sure you are editing your map as an Eternity map. Once your flags are set for your linedefs, run the map, and the player should now be able to cross the bridge as if the middle textures were solid objects.

	== Some things to watch out for ==		== Some things to watch out for ==
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	=== Holes in your structures ===		=== Holes in your structures ===

	Each structure needs to be closed enough to support the objects running over it. That is ~~to say~~, the lines need to be close enough together so that an object can't slip through the gaps.		Each structure needs to be closed enough to support the objects running over it. That is, the lines need to be close enough together so that an object can't slip through the gaps.

	[[Image:3dmidtex_tut3.jpg]]		[[Image:3dmidtex_tut3.jpg]]


	=== Clipping ===		=== Clipping ===
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	It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is.		It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is.

	Also please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much ~~processor~~ power to accomplish.		Also, please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much processing power to accomplish.

	=== Monsters crossing ===		=== Monsters crossing ===

	Because of the way monster AI in ~~doom~~ works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step ~~onto~~. Here are some tips to help you overcome this.		Because of the way monster AI in Doom works, it can be VERY tricky to get monsters to cross a 3D bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line, because the engine assumes there is nothing on the other side for the monster to step on. Here are some tips to help you overcome this.

	When a monster comes in contact with a 3DMidTex line that it can stand on (ie, is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to ~~make sure~~ that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a ~~3dMidTex~~ line inside the nitch you just created.		When a monster comes in contact with a 3DMidTex line that it can stand on (i.e., is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to ensure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3DMidTex line inside the nitch you just created.

	[[Image:3dmidtex_tut4.jpg]]		[[Image:3dmidtex_tut4.jpg]]

	Now monsters are much more likely to cross your bridge. Another thing to note is that monsters have no idea which line is the edge of the 3d bridge, and will hang off the edges. They won't fall down, so don't worry, but ~~this~~ just looks bad. One remedy is to make the outer edges monster impassible. When the 3DMidTex flag and this are used in conjunction, monsters will be blocked when they try to cross on top of that 3DMidTex, however, they won't be blocked by going under it.		Now monsters are much more likely to cross your bridge. Another thing to note is that monsters have no idea which line is the edge of the 3D bridge, and will hang off the edges. They won't fall down, so don't worry, but it just looks bad. One remedy is to make the outer edges monster impassible. When the 3DMidTex flag and this are used in conjunction, monsters will be blocked when they try to cross on top of that 3DMidTex; however, they won't be blocked by going under it.


	Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.		Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.

	[[Category:Tutorials]]		[[Category:Tutorials]]

SoM: /* Monsters crossing */

2006-01-06T04:36:30Z

Monsters crossing

← Older revision		Revision as of 00:36, 6 January 2006
Line 39:		Line 39:
	Because of the way monster AI in doom works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.		Because of the way monster AI in doom works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.

	When a monster comes in contact with a 3DMidTex line that it can stand on (ie, is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way to ~~insure~~ that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One ~~simple~~ way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3dMidTex line inside the nitch you just created.		When a monster comes in contact with a 3DMidTex line that it can stand on (ie, is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way is to make sure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3dMidTex line inside the nitch you just created.

	[[Image:3dmidtex_tut4.jpg]]		[[Image:3dmidtex_tut4.jpg]]

SoM at 04:27, 6 January 2006

2006-01-06T04:27:07Z

← Older revision		Revision as of 00:27, 6 January 2006
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	[[Eternity]] provides the possibility of using the middle textures of linedefs as solid objects that can be walked over or under, and can block map object passage. Monsters can walk across them, and they can even be moved (with the assistance of some linedef specials) to create lifts, doors, anything you like. They are quite useful and easy to implement.		[[Eternity]] provides the possibility of using the middle textures of linedefs as solid objects that can be walked over or under, and can block map object passage. Monsters can walk across them, and they can even be moved (with the assistance of some linedef specials) to create lifts, doors, anything you like. They are quite useful and easy to implement.

	This feature is called [[3DMidTex]], and this tutorial covers the basics of how to use it. Once you are finished with here, you may want to read [[3DMidTex advanced topics]] to learn about the use of [[3DMidTex]] lines with switches, doors, and lifts.		This feature is called [[3DMidTex]], and this tutorial covers the basics of how to use it. Once you are finished with here, you may want to read [[3DMidTex advanced topics]] to learn about the use of 3DMidTex lines with switches, doors, and lifts.


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	Also please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much processor power to accomplish.		Also please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much processor power to accomplish.


	=== Monsters crossing ===		=== Monsters crossing ===
Line 40:		Line 39:
	Because of the way monster AI in doom works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.		Because of the way monster AI in doom works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.

	~~Note~~: this is ~~obviously unfinished~~. ~~Check back later~~.		When a monster comes in contact with a 3DMidTex line that it can stand on (ie, is not under or high above) the monster will ignore all lines with big drop-offs that it would otherwise not cross. The easiest way to insure that the monster will not cross any big dropoff lines before stepping on a 3DMidTex line. One simple way to do this is to create stair steps on either side of your bridge that drop 16 units down, and place a 3dMidTex line inside the nitch you just created.

			[[Image:3dmidtex_tut4.jpg]]

			Now monsters are much more likely to cross your bridge. Another thing to note is that monsters have no idea which line is the edge of the 3d bridge, and will hang off the edges. They won't fall down, so don't worry, but this just looks bad. One remedy is to make the outer edges monster impassible. When the 3DMidTex flag and this are used in conjunction, monsters will be blocked when they try to cross on top of that 3DMidTex, however, they won't be blocked by going under it.


			Now that you've mastered the art of the 3D bridge, you should give [[3DMidTex advanced topics]] a try.

	[[Category:Tutorials]]		[[Category:Tutorials]]

SoM at 01:37, 6 January 2006

2006-01-06T01:37:26Z

← Older revision		Revision as of 21:37, 5 January 2006
Line 1:		Line 1:
	[[Eternity]] provides the possibility of using the middle textures of linedefs as solid objects that can be walked over or under, and can block map object passage. Monsters can walk across them, and they can even be moved (with the assistance of some linedef specials) to create lifts, doors, anything you like. They are quite useful and easy to implement.		[[Eternity]] provides the possibility of using the middle textures of linedefs as solid objects that can be walked over or under, and can block map object passage. Monsters can walk across them, and they can even be moved (with the assistance of some linedef specials) to create lifts, doors, anything you like. They are quite useful and easy to implement.

	This feature is called [[3DMidTex]], and this tutorial covers the basics of how to use it. Once you are finished with here, you may want to read [[3DMidTex advanced topics]] to learn about the use of [[3DMidTex]] lines with ~~switces~~, doors, and lifts.		This feature is called [[3DMidTex]], and this tutorial covers the basics of how to use it. Once you are finished with here, you may want to read [[3DMidTex advanced topics]] to learn about the use of [[3DMidTex]] lines with switches, doors, and lifts.


	== Your first 3D bridge ==		== Your first 3D bridge ==

	For the purposes of this tutorial, I'll assume you are ~~familure~~ with Doom editing and your level editor, and with the use of middle textures. You will need to use an editor that either A. has support for Eternity features (IE. DoomBuilder) or an editor that allows you to manually change the flags value for linedefs. I use DoomBuilder, you should too ;)		For the purposes of this tutorial, I'll assume you are familiar with Doom editing and your level editor, and with the use of middle textures. You will need to use an editor that either A. has support for Eternity features (IE. DoomBuilder) or an editor that allows you to manually change the flags value for linedefs. I use DoomBuilder, you should too ;)

	First, open up a new Doom2 level for editing, create a simple room with a pit running through it.		First, open up a new Doom2 level for editing, create a simple room with a pit running through it.
Line 31:		Line 31:
	=== Clipping ===		=== Clipping ===

	It is ~~importaint~~ to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is.		It is important to note that clipping is determined by the '''front side''' offset and texture height, so if both sides of the 3DMidTex aren't aligned to be in the same spot or the textures are different heights, the solid part of the line will be where the front side texture is.

	Also please note that the entire height of the texture is considered solid ~~reguardless~~ of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much processor power to accomplish.		Also please note that the entire height of the texture is considered solid regardless of the transparency of the texture. So the player can't pass through a 64x32 unit hole in a texture. This would have required too much processor power to accomplish.


	=== Monsters crossing ===		=== Monsters crossing ===

	Because of the way monster AI in doom works, it can be VERY ~~trickey~~ to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.		Because of the way monster AI in doom works, it can be VERY tricky to get monsters to cross a 3d bridge. When a monster contacts a line in a map with a drop that's too far for it, the monster will not cross that line because the engine assumes there is nothing on the other side for the monster to step onto. Here are some tips to help you overcome this.

	Note: this is obviously unfinished. Check back later.		Note: this is obviously unfinished. Check back later.

	[[Category:Tutorials]]		[[Category:Tutorials]]

← Older revision		Revision as of 02:03, 24 July 2019
Line 47:		Line 47:

	==See also==		==See also==
			*[[3DMidTex advanced topics]]
	*[[Linked portal]] (see also "Edge portals" and "Attached portals" for solid-looking 3D bridges).		*[[Linked portal]] (see also "Edge portals" and "Attached portals" for solid-looking 3D bridges).

	[[Category:Tutorials]]		[[Category:Tutorials]]