Fluids - Revision history

Omega Tyrant at 05:34, 11 August 2025

2025-08-11T05:34:05Z

Omega Tyrant at 05:33, 11 August 2025

2025-08-11T05:33:16Z

Omega Tyrant at 05:32, 11 August 2025

2025-08-11T05:32:19Z

Omega Tyrant: Beginning on some work on updating the wiki for the new version.

2025-08-11T05:30:59Z

Beginning on some work on updating the wiki for the new version.

Omega Tyrant at 09:17, 15 January 2025

2025-01-15T09:17:12Z

Shark20061: All rivers have bridges since of 0994, updated page to reflect this

2012-03-06T08:31:35Z

All rivers have bridges since of 0994, updated page to reflect this

Game Hunter: wrong lava tile color

2011-07-15T20:12:57Z

wrong lava tile color

Game Hunter: Created page with "NOTOC Fluid refers to either water, acid, or lava. The differences are as follows: * '''Water''' (represented by a = or <..."

2011-07-15T04:16:09Z

Created page with "__NOTOC__ Fluid refers to either water, acid, or lava. The differences are as follows: * '''Water''' (represented by a = or <..."

New page

__NOTOC__
Fluid refers to either water, acid, or lava.

The differences are as follows:
* '''Water''' (represented by a = or =) doesn't hurt at all, and is mostly decorative.
* '''Acid''' (represented by a = or =) does 6 acid damage per action.
* '''Lava''' (represented by a = or =) does 12 fire damage per action.

{{Technical}}

With the exception of fluid rooms, all fluids are placed by random walks as described in this section. For most level types, fluid placement is done after wall placement as a separate step.

For the purposes of placing a fluid, a single random walk of length n proceeds as follows. Start at a random tile in the interior of the map. Replace it with the fluid. Then walk in one of 8 random directions (including diagonals) or don't move, each with probability 1/9. Repeat this n times (so that at most n fluid tiles have been placed). If a move would go into the border of the, it is pushed back into the map.

Depending on dlevel, fluid varies in several ways. Mainly, the type of fluid varies. Also, the number of random walks and length of random walks varies. The data follows:
{|
|'''dlevel'''
|'''Fluid'''
|'''Number of Walks'''
|'''Length of Walks'''
|-
|<6
|water
|1d3-1
|1d40+2
|-
|6-10
|acid
|1d3-1
|1d40+2
|-
|11-15
|lava
|1d5-1
|1d50+2
|-
|>15
|lava
|1d5+3
|1d40+2
|}

Notice that until dlevel 16, there is a chance of 0 random walks. This corresponds to levels with no fluids.

Here are some examples of length length 40 random walks:
{|style="border: 2px solid darkred; border-spacing: 0; margin: 0.25em 0.5em"
!style="background: darkred; color: yellow; text-align: center"|'''Random Walks (Length 40)'''
|-
|
·························································
····=················===·································
·····=···············===···········=···········==········
··==·=·······=·==····=··=·······=·=·=·=·······===····==··
·===·==······=====····==·=·····=·=====········==····===··
··===··=····=====·=····====·=···==··=·=······=====··===··
··==·=··=··========·····==·=····=·····=·····=·===····===·
···=···=····==·=·==······===·········====····=······====·
····=·=···················==··········====··········===··
·····=·················································=·
·························································
|}

Notice that the number of tiles covered is less than 40. This is because the walk often returns to a tile it has already visited. The contribution of length to coverage has diminishing returns. Very large areas of fluid are generally the result of several overlapping walks with varied starting points.

==Rivers==
Different level types have different chances of generating rivers and different restrictions on river types. First we describe the basic algorithm.

The fluid type of rivers is determined by a roll of 1d(6 + 2 × difficulty) + dlevel.
{|
|'''Roll'''
|'''Fluid'''
|-
|1-14
|water
|-
|15-24
|acid
|-
|>24
|lava
|}

For levels the allow horizontal rivers, there is a 1/4 chance of a single horizontal river and a 3/4 chance of one or more vertical rivers.

If vertical rivers are chosen, there is a 2/3 chance of 1 river, a 1/4 chance of 2 rivers, and a 1/12 chance of 3 rivers.

Horizontal rivers have a width of 1d3 + 1 and a 5/6 chance of having a bridge. The starting y coordinate is given by 1d(2 × width) + 11 - width. (Basically, horizontal rivers tend to start in the center of the map.)

Single vertical rivers have a width of 1d3 + 3 and a 3/4 chance of having a bridge. The starting x coordinate is 1d40 + 19.

Double vertical rivers have (independent) widths of 1d3 + 2 and (independent) 2/3 chances of having a bridge. The starting x coordinates are 1d22 + 9 and 1d22 + 49.

Triple vertical rivers have widths of 1d3 + 1 and 3/4 chances of having a bridge. The starting x coordinates are 1d20 + 9, 1d16 + 33, and 1d20 + 51.

Bridges always have a width of 2. For a horizontal river, the bridge will start with an x coordinate given by 1d60 + 8. For a vertical river, the bridge will start with a y coordinate of 1d14 + 3.

Rivers can also meander (left and right for vertical rivers; up and down for horizontal rivers). Horizontal rivers are generated from left to right and have a 1/9 chance of meandering on each step. (Up and down are equally likely.) Vertical rivers are generated from top to bottom and have a 2/9 chance of meandering each step. Meandering cannot cause a river to reach all the way to the edge of the map.

@@ Line 11: / Line 11: @@
 {{Technical}}
-{{Outdated|0.10.0|this version added the mud and blood fluids, and deeper A100 fluid generation overhauled fluid generation, so the following technical data is no longer accurate.}}
+{{Outdated|0.10.0|this version added the mud and blood fluids, and deeper A100 fluid generation was overhauled, so the following technical data is no longer accurate.}}
 With the exception of fluid rooms, all fluids are placed by random walks as described in this section. For most level types, fluid placement is done after wall placement as a separate step.

← Older revision		Revision as of 05:33, 11 August 2025
Line 1:		Line 1:
		+	{{infostrat switch}}
		+
	__NOTOC__		__NOTOC__
	Fluids are a type of floor tile representing liquids, which will [[time\|slow down]] all non-flying entities when moving through them, and may cause [[damage]] to entities standing on the fluid tile. The different type of fluids in DRL are as follows:		Fluids are a type of floor tile representing liquids, which will [[time\|slow down]] all non-flying entities when moving through them, and may cause [[damage]] to entities standing on the fluid tile. The different type of fluids in DRL are as follows:

@@ Line 3: / Line 3: @@
 * '''Water''' (represented by a <font color="blue"><b>=</b></font> or <font color="lightblue"><b>=</b></font>) doesn't damage and is mostly decorative, but movement time on water tiles will be increased by 25% (e.g. at the default speed of each movement taking 1 second, movement on water will take 1.25 seconds). Additionally, any enemy that dies on water will not leave a [[corpse]], making it useful to prevent them from being resurrected, such as when fighting [[Arch-vile]]s, playing the [[Nightmare!]] difficulty, or playing [[Angel of Darkness]].
-* '''Mud''' (represented by a <font color="yellow"><b>=</b></font> or <font color="brown"><b>=</b></font>) also doesn't damage, but will slow down the players and enemies much more dramatically than other fluids, with movement time on mud tiles being increased by 65% (e.g. at the default speed of each movement taking 1 second, movement on mud will take 1.65 seconds). Like with water, any enemy that dies on mud will not leave a corpse.
+* '''Mud''' (represented by a <font color="yellow"><b>=</b></font> or <font color="brown"><b>=</b></font>) also doesn't damage, but will slow down the player and enemies much more dramatically than other fluids, with movement time on mud tiles being increased by 65% (e.g. at the default speed of each movement taking 1 second, movement on mud will take 1.65 seconds). Like with water, any enemy that dies on mud will not leave a corpse.
 * '''Acid''' (represented by a <font color="green"><b>=</b></font> or <font color="lightgreen"><b>=</b></font>) does 6 [[acid]] damage per action to any entity that isn't immune to acid nor fluids. Any enemy that dies in acid will not leave a corpse, and any [[item]] dropped in acid will be destroyed, unless it's a [[Unique]]. Movement time on acid tiles will additionally be increased by 25%, and [[phase device]]s will not be able to drop the player on an acid tile.
 * '''Lava''' (represented by a <font color="yellow"><b>=</b></font> or <font color="red"><b>=</b></font>) does 12 [[fire]] damage per action to any entity that isn't immune to fire nor fluids. Any enemy that dies in lava will not leave a corpse, and any item dropped in lava will be destroyed, unless it's a Unique. Movement time on lava tiles will additionally be increased by 25%, and phase devices will not be able to drop the player on a lava tile.

@@ Line 1: / Line 1: @@
 __NOTOC__
-Fluid refers to either water, acid, or lava.
+Fluids are a type of floor tile representing liquids, which will [[time|slow down]] all non-flying entities when moving through them, and may cause [[damage]] to entities standing on the fluid tile. The different type of fluids in DRL are as follows:
-The differences are as follows:
+* '''Water''' (represented by a <font color="blue"><b>=</b></font> or <font color="lightblue"><b>=</b></font>) doesn't damage and is mostly decorative, but movement time on water tiles will be increased by 25% (e.g. at the default speed of each movement taking 1 second, movement on water will take 1.25 seconds). Additionally, any enemy that dies on water will not leave a [[corpse]], making it useful to prevent them from being resurrected, such as when fighting [[Arch-vile]]s, playing the [[Nightmare!]] difficulty, or playing [[Angel of Darkness]].
-* '''Water''' (represented by a <font color="navy"><b>=</b></font> or <font color="blue"><b>=</b></font>) doesn't hurt at all and is mostly decorative, but any enemy that dies on water will not leave a [[corpse]], making it useful when enemies can be resurrected, such as when fighting [[Arch-vile]]s, playing the [[Nightmare!]] difficulty, or playing [[Angel of Darkness]].
+* '''Mud''' (represented by a <font color="yellow"><b>=</b></font> or <font color="brown"><b>=</b></font>) also doesn't damage, but will slow down the players and enemies much more dramatically than other fluids, with movement time on mud tiles being increased by 65% (e.g. at the default speed of each movement taking 1 second, movement on mud will take 1.65 seconds). Like with water, any enemy that dies on mud will not leave a corpse.
-* '''Acid''' (represented by a <font color="green"><b>=</b></font> or <font color="lime"><b>=</b></font>) does 6 acid damage per action to any entity that isn't immune to acid nor fluids. Any enemy that dies in acid will not leave a corpse, and any item dropped in acid will be destroyed, unless it's a [[Unique]].
+* '''Acid''' (represented by a <font color="green"><b>=</b></font> or <font color="lightgreen"><b>=</b></font>) does 6 [[acid]] damage per action to any entity that isn't immune to acid nor fluids. Any enemy that dies in acid will not leave a corpse, and any [[item]] dropped in acid will be destroyed, unless it's a [[Unique]]. Movement time on acid tiles will additionally be increased by 25%, and [[phase device]]s will not be able to drop the player on an acid tile.
-* '''Lava''' (represented by a <font color="maroon"><b>=</b></font> or <font color="yellow"><b>=</b></font>) does 12 fire damage per action to any entity that isn't immune to fire nor fluids. Any enemy that dies in lava will not leave a corpse, and any item dropped in lava will be destroyed, unless it's a Unique.
+* '''Lava''' (represented by a <font color="yellow"><b>=</b></font> or <font color="red"><b>=</b></font>) does 12 [[fire]] damage per action to any entity that isn't immune to fire nor fluids. Any enemy that dies in lava will not leave a corpse, and any item dropped in lava will be destroyed, unless it's a Unique. Movement time on lava tiles will additionally be increased by 25%, and phase devices will not be able to drop the player on a lava tile.
 {{Technical}}
 With the exception of fluid rooms, all fluids are placed by random walks as described in this section. For most level types, fluid placement is done after wall placement as a separate step.

@@ Line 3: / Line 3: @@
 The differences are as follows:
-* '''Water''' (represented by a <font color="navy"><b>=</b></font> or <font color="blue"><b>=</b></font>) doesn't hurt at all, and is mostly decorative.
+* '''Water''' (represented by a <font color="navy"><b>=</b></font> or <font color="blue"><b>=</b></font>) doesn't hurt at all and is mostly decorative, but any enemy that dies on water will not leave a [[corpse]], making it useful when enemies can be resurrected, such as when fighting [[Arch-vile]]s, playing the [[Nightmare!]] difficulty, or playing [[Angel of Darkness]].
-* '''Acid''' (represented by a <font color="green"><b>=</b></font> or <font color="lime"><b>=</b></font>) does 6 acid damage per action.
+* '''Acid''' (represented by a <font color="green"><b>=</b></font> or <font color="lime"><b>=</b></font>) does 6 acid damage per action to any entity that isn't immune to acid nor fluids. Any enemy that dies in acid will not leave a corpse, and any item dropped in acid will be destroyed, unless it's a [[Unique]].
-* '''Lava''' (represented by a <font color="maroon"><b>=</b></font> or <font color="yellow"><b>=</b></font>) does 12 fire damage per action.
+* '''Lava''' (represented by a <font color="maroon"><b>=</b></font> or <font color="yellow"><b>=</b></font>) does 12 fire damage per action to any entity that isn't immune to fire nor fluids. Any enemy that dies in lava will not leave a corpse, and any item dropped in lava will be destroyed, unless it's a Unique.
-−
 {{Technical}}

@@ Line 85: / Line 85: @@
 If vertical rivers are chosen, there is a 2/3 chance of 1 river, a 1/4 chance of 2 rivers, and a 1/12 chance of 3 rivers.
-Horizontal rivers have a width of 1d3 + 1 and a 5/6 chance of having a bridge. The starting y coordinate is given by 1d(2 &times; width) + 11 - width. (Basically, horizontal rivers tend to start in the center of the map.)
+Horizontal rivers have a width of 1d3 + 1. The starting y coordinate is given by 1d(2 &times; width) + 11 - width. (Basically, horizontal rivers tend to start in the center of the map.)
-Single vertical rivers have a width of 1d3 + 3 and a 3/4 chance of having a bridge. The starting x coordinate is 1d40 + 19.
+Single vertical rivers have a width of 1d3 + 3. The starting x coordinate is 1d40 + 19.
-Double vertical rivers have (independent) widths of 1d3 + 2 and (independent) 2/3 chances of having a bridge. The starting x coordinates are 1d22 + 9 and 1d22 + 49.
+Double vertical rivers have (independent) widths of 1d3 + 2. The starting x coordinates are 1d22 + 9 and 1d22 + 49.
-Triple vertical rivers have widths of 1d3 + 1 and 3/4 chances of having a bridge. The starting x coordinates are 1d20 + 9, 1d16 + 33, and 1d20 + 51.
+Triple vertical rivers have widths of 1d3 + 1. The starting x coordinates are 1d20 + 9, 1d16 + 33, and 1d20 + 51.
-Bridges always have a width of 2. For a horizontal river, the bridge will start with an x coordinate given by 1d60 + 8. For a vertical river, the bridge will start with a y coordinate of 1d14 + 3.
+Rivers always have a bridge. Bridges always have a width of 2. For a horizontal river, the bridge will start with an x coordinate given by 1d60 + 8. For a vertical river, the bridge will start with a y coordinate of 1d14 + 3.
 Rivers can also meander (left and right for vertical rivers; up and down for horizontal rivers). Horizontal rivers are generated from left to right and have a 1/9 chance of meandering on each step. (Up and down are equally likely.) Vertical rivers are generated from top to bottom and have a 2/9 chance of meandering each step. Meandering cannot cause a river to reach all the way to the edge of the map.