Half-Life Materials System

Half-Life, from Valve Software, is a first-person shooter based on a heavily modified version of the Quake engine. One of the many improvements to the engine was a primitive "materials" system: certain textures were assigned to a material type (e.g. dirt, metal, glass), and then the engine would treat these surfaces specially with added effects (different footsteps, sounds when shot, etc).

Several tutorials exist online for how to use the system, but I found them not comprehensive enough, and also there were many untested edge cases that could arise in the system. This page contains details on how to use the system, descriptions of the quirks and how mappers can use them. Finally there is a gallery of all available "materials" in the base Half-Life game, the textures that map to the materials, and example sounds for each material type.

Introduction
Contents
Basic Description
Quirks
Technical Details
Materials Gallery

Basic Description

The system works by using a single file, "valve/sound/materials.txt" located within the main Half-Life install folder. Within the file is a series of lines that assign texture names to the first letter of their materials type, for example:

// Half-Life Texture Types.  Modify this file only if texture names are changed!
//  'M' metal, 'V' ventillation, 'D' dirt, 'S' slosh liquid 
//  'T' tile, 'G' grate (Concrete is the default), 'W' wood, 'P' computer, 'Y' glass

V SILO2_COR
D OUT_GRVL1
M SILO2_P2

would cause any surface with SILO_COR2 to use "V"ent sound effects, OUT_GRVL1 is "D"irt and SILO2_P2 is "M"etal. Any texture NOT covered by this file receives the default "concrete" sounds instead. (This includes the tool textures like NULL, CLIP, AAATRIGGER etc).

Unfortunately, this file is global, and applies to ALL texture names used across ALL maps for a given mod. It also cannot be overridden with custom, map-specific entries.

There are a few ways around this problem:

Don't worry about it, and live with the default sounds for your custom maps.
Edit materials.txt yourself. But, all players and server must share the changed file... so you could create a mod with your own materials.txt and assign names as you like.
Override the materials for objects by using brush entities that allow material choice. Currently, only func_pushable and func_breakable allow this: you could use func_breakable, with "Only Trigger", and then never actually assign a trigger thus making it "unbreakable".
Name your custom textures to match something already in this file. BSP-included textures override those from WAD files, so your custom textures should take precedence over the stock HL ones.

Quirks

Some quirks of the system can be exploited by mappers to make adding new textures easier. Note that all HL textures have a 15-character name limit, so when using one of these methods, be sure the new texture name still fits.

12-Character Limit

The header of materials.txt includes this information:

// NOTE: only the first 12 characters of the texture name are used

The comment is interesting for mappers, because it means that it is possible to add many more custom textures without having to overwrite existing ones: by using an existing 12-character material in the list, and using that name as a prefix for your new texture, the first 12 characters will match.

For example, "CRETE2_FLR03" is listed as a "Grate" type texture that is 12 characters long. If you create a custom texture, called CRETE2_FLR03_NU, it will still sound like a Grate because the first 12 characters match. However, "ELEV1_FLR" is also listed, but cannot be used for this purpose: if you create "ELEV1_FLR_MyFlr", only the first 8 characters match.

For this reason 12+ character names in the materials file are "special" and will be highlighted in the Gallery below. This quirk is actually used by some stock HL textures as well to provide material sounds to several textures with one entry, e.g. DRKMTLT_WALL)

Prefix Characters

When the engine compares materials.txt to a map texture, it first removes "texture prefix" characters from the map texture. Specifically, it removes a leading +0 or -0 (or any other digit or letter), then can also remove one of !, ~, {, or space, before comparing. In practice, this means that an entry like

G CHAIN_LINK

will match all of the following texture names:

+0CHAIN_LINK
-2CHAIN_LINK
+A~CHAIN_LINK
~CHAIN_LINK
+1{CHAIN_LINK

Like the 12-character limit (above), this can be exploited to add new textures without replacing existing ones, by prepending an unused prefix. For example, to add another wood texture, you could name your texture "-1OUT_WD". This matches OUT_WD from materials.txt but leaves OUT_WD from halflife.wad available as well.

Some prefixes have special meaning, so it is probably best to avoid ! ("liquid"), -0 ("randomly tiled") and { ("semi-transparent").

Technical Details

The material handling code (which types are available, and what do they do?) is entirely hard-coded in a couple of places in the Half-Life DLL files. Mod makers can change this to add new material types or alter the sounds played, but without recompiling the only control is provided through materials.txt. Here are relevant technical details based on code from the Half-Life SDK, which covers basic Half-Life and HLDM (as well as Ricochet and Deathmatch Classic). Other mods may have their own rules.

Footsteps

The first part of material handling changes the player footstep sound based on the material they are on. This is stored in Single-Player Source, "pm_shared/pm_shared.c" (the "player movement" shared code). Arrays of 512 entries store mappings of 12-character texture names to a texture type, based on this list:

#define CHAR_TEX_CONCRETE  'C'                     // texture types
#define CHAR_TEX_METAL          'M'
#define CHAR_TEX_DIRT           'D'
#define CHAR_TEX_VENT           'V'
#define CHAR_TEX_GRATE          'G'
#define CHAR_TEX_TILE           'T'
#define CHAR_TEX_SLOSH          'S'
#define CHAR_TEX_WOOD           'W'
#define CHAR_TEX_COMPUTER       'P'
#define CHAR_TEX_GLASS          'Y'
#define CHAR_TEX_FLESH          'F'

When choosing a footstep sound to play, the texture under the player is checked against the list to find a type. Player footsteps alternate left/right and play different sounds for each foot. The material sound to use is determined in PM_UpdateStepSound() (line 491), rules being:

If the player's on a ladder, use ladder sounds.
Else if the player's knee height is in content_water, play "Wading" sounds.
Else if the player's foot height is in content_water, play "Slosh Liquid" sounds.
Else, check the texture underneath them and use special foot-step sounds based on materials.txt:
- Metal
- Dirt
- Vent
- Grate
- Tile
- Slosh
All other cases use the default "Concrete" sounds - this includes walking on wood, computer, glass, etc. as well as textures not mentioned in the file, and the tool textures (hence "CLIP" always sounds like concrete).

The actual play routine is at line 286, PM_PlayStepSound(). The determined step type is combined with the left/right foot choice and used to play alternating steps. One interesting trivia is that "Tile" steps have an extra sample for the right foot.

Weapon Noises

Part of the system code is visible in the Half-Life SDK, Single-Player Source, file "sound.cpp", beginning from line 1468. The code demonstrates loading of materials.txt and then using the values to return sounds or effects based on the material hit. File loading code begins at TEXTURETYPE_Init() (line 1535), where up to 512 textures are read from materials.txt and stored. Note string termination at the 13th char, and later "strnicmp" in TEXTURETYPE_Find() limited to a 12-character match.

TEXTURETYPE_PlaySound (line 1622) returns the specific sounds to play based on the texture type hit. When performing world-texture lookup, leading -0, +A etc are stripped, then leading special characters {, ~, ! and space are removed. Assuming a successful lookup, this code block determines the actual sound effects played:

   switch (chTextureType)
        {
        default:
        case CHAR_TEX_CONCRETE: fvol = 0.9;     fvolbar = 0.6;
                rgsz[0] = "player/pl_step1.wav";
                rgsz[1] = "player/pl_step2.wav";
                cnt = 2;
                break;
        case CHAR_TEX_METAL: fvol = 0.9; fvolbar = 0.3;
                rgsz[0] = "player/pl_metal1.wav";
                rgsz[1] = "player/pl_metal2.wav";
                cnt = 2;
                break;
        case CHAR_TEX_DIRT:     fvol = 0.9; fvolbar = 0.1;
                rgsz[0] = "player/pl_dirt1.wav";
                rgsz[1] = "player/pl_dirt2.wav";
                rgsz[2] = "player/pl_dirt3.wav";
                cnt = 3;
                break;
        case CHAR_TEX_VENT:     fvol = 0.5; fvolbar = 0.3;
                rgsz[0] = "player/pl_duct1.wav";
                rgsz[1] = "player/pl_duct1.wav";
                cnt = 2;
                break;
        case CHAR_TEX_GRATE: fvol = 0.9; fvolbar = 0.5;
                rgsz[0] = "player/pl_grate1.wav";
                rgsz[1] = "player/pl_grate4.wav";
                cnt = 2;
                break;
        case CHAR_TEX_TILE:     fvol = 0.8; fvolbar = 0.2;
                rgsz[0] = "player/pl_tile1.wav";
                rgsz[1] = "player/pl_tile3.wav";
                rgsz[2] = "player/pl_tile2.wav";
                rgsz[3] = "player/pl_tile4.wav";
                cnt = 4;
                break;
        case CHAR_TEX_SLOSH: fvol = 0.9; fvolbar = 0.0;
                rgsz[0] = "player/pl_slosh1.wav";
                rgsz[1] = "player/pl_slosh3.wav";
                rgsz[2] = "player/pl_slosh2.wav";
                rgsz[3] = "player/pl_slosh4.wav";
                cnt = 4;
                break;
        case CHAR_TEX_WOOD: fvol = 0.9; fvolbar = 0.2;
                rgsz[0] = "debris/wood1.wav";
                rgsz[1] = "debris/wood2.wav";
                rgsz[2] = "debris/wood3.wav";
                cnt = 3;
                break;
        case CHAR_TEX_GLASS:
        case CHAR_TEX_COMPUTER:
                fvol = 0.8; fvolbar = 0.2;
                rgsz[0] = "debris/glass1.wav";
                rgsz[1] = "debris/glass2.wav";
                rgsz[2] = "debris/glass3.wav";
                cnt = 3;
                break;
        case CHAR_TEX_FLESH:
                if (iBulletType == BULLET_PLAYER_CROWBAR)
                        return 0.0; // crowbar already makes this sound
                fvol = 1.0;     fvolbar = 0.2;
                rgsz[0] = "weapons/bullet_hit1.wav";
                rgsz[1] = "weapons/bullet_hit2.wav";
                fattn = 1.0;
                cnt = 2;
                break;
        }

        // did we hit a breakable?

        if (pEntity && FClassnameIs(pEntity->pev, "func_breakable"))
        {
                // drop volumes, the object will already play a damaged sound
                fvol /= 1.5;
                fvolbar /= 2.0; 
        }
        else if (chTextureType == CHAR_TEX_COMPUTER)
        {
                // play random spark if computer

                if ( ptr->flFraction != 1.0 && RANDOM_LONG(0,1))
                {
                        UTIL_Sparks( ptr->vecEndPos );

                        float flVolume = RANDOM_FLOAT ( 0.7 , 1.0 );//random volume range
                        switch ( RANDOM_LONG(0,1) )
                        {
                                case 0: UTIL_EmitAmbientSound(ENT(0), ptr->vecEndPos, "buttons/spark5.wav",
                                    flVolume, ATTN_NORM, 0, 100); break;
                                case 1: UTIL_EmitAmbientSound(ENT(0), ptr->vecEndPos, "buttons/spark6.wav",
                                    flVolume, ATTN_NORM, 0, 100); break;
                                // case 0: EMIT_SOUND(ENT(pev), CHAN_VOICE, "buttons/spark5.wav", flVolume, ATTN_NORM); break;
                                // case 1: EMIT_SOUND(ENT(pev), CHAN_VOICE, "buttons/spark6.wav", flVolume, ATTN_NORM); break;
                        }
                }
        }

        // play material hit sound
        UTIL_EmitAmbientSound(ENT(0), ptr->vecEndPos, rgsz[RANDOM_LONG(0,cnt-1)], fvol, fattn, 0, 96 + RANDOM_LONG(0,0xf));
        //EMIT_SOUND_DYN( ENT(m_pPlayer->pev), CHAN_WEAPON, rgsz[RANDOM_LONG(0,cnt-1)], fvol, ATTN_NORM, 0, 96 + RANDOM_LONG(0,0xf));
                        
        return fvolbar;
}

A few interesting things to note here:

In many cases, the "hit" sound is the same as the footsteps sound, except with less random variation. For example, Concrete footsteps use player/pl_step1.wav through player/pl_step4.wav, but Concrete "hit" sounds use only pl_step1 and pl_step2.
A "Flesh" material exists and will play flesh-hitting sounds when used, but only if the weapon is not the crowbar. To use Flesh sounds the prefix "F" is used in materials.txt.
Hitting a "computer" is the same as hitting "glass", except a computer also fires a spark.
Hitting func_breakable objects doesn't "replace" the texture sound, it simply "quiets" it and allows the breakable to play its own sound too.

Materials Gallery

The following sections describe each material type in Half-Life, as well as the textures from the base four WAD files (halflife.wad, liquids.wad, xeno.wad, decals.wad) that match those material. Each section also includes short audio clips of the associated footsteps and weapon sounds.

Concrete

Type	C
Sample footsteps
Sample hit sounds
Notes	"Concrete" is the default sound and is used when a texture does not match any defined in materials.txt. It IS possible to assign a texture to concrete using material type "C" but this has no different effect than just leaving it undefined.

Flesh

Type	F
Sample footsteps
Sample hit sounds
Notes	No "flesh" materials are listed in materials.txt, so this material is unavailable to mappers. The hit sound does not play when using the crowbar.

Dirt

Type	D
Sample footsteps
Sample hit sounds
Notes	There are no 12-character Dirt texture names in materials.txt.

Material Name	Textures
FROSTSEWFLR	frostsewflr
GENERIC48	generic48
GENERIC49	generic49
GENERIC51	generic51
GENERIC52	generic52
GENERIC93	generic93
OUT_DIRT1	out_dirt1
OUT_DIRT2	-0out_dirt2 -1out_dirt2 -2out_dirt2 -3out_dirt2 -4out_dirt2
OUT_GRSS1	-0out_grss1 -1out_grss1 -2out_grss1
OUT_GRVL1	-0out_grvl1 -1out_grvl1 -2out_grvl1
OUT_GRVL2	out_grvl2
OUT_GRVL2B	out_grvl2b
OUT_GRVL3	out_grvl3
OUT_MUD1	out_mud1
OUT_NET1	out_net1 {out_net1
OUT_NET1B	{out_net1b
OUT_PAVE2	out_pave2
OUT_SNBAG	out_snbag
OUT_SNBAG2	out_snbag2
OUT_SNBAGB	out_snbagb
OUT_SNBAGC	out_snbagc
OUT_SND1	out_snd1
OUT_SND2	out_snd2
OUT_SND2B	out_snd2b
OUT_SND2C	out_snd2c
OUT_TNT1	out_tnt1
OUT_TNT1B	out_tnt1b
OUT_TNT1C	out_tnt1c
OUT_TNT2	out_tnt2
OUT_TNT3	out_tnt3
OUT_TNT3B	out_tnt3b
OUT_WLK	out_wlk

Grate

Type	G
Sample footsteps
Sample hit sounds
Notes	n/a

Material Name	Textures
BABTECH_FLR02 (12 characters)	babtech_flr02
CRETE2_FLR03 (12 characters)	crete2_flr03 crete2_flr03a crete2_flr03b crete2_flr03c
CRETE2_FLR03A (12 characters)	crete2_flr03 crete2_flr03a crete2_flr03b crete2_flr03c
CRETE2_FLR03B (12 characters)	crete2_flr03 crete2_flr03a crete2_flr03b crete2_flr03c
CRETE2_FLR03C (12 characters)	crete2_flr03 crete2_flr03a crete2_flr03b crete2_flr03c
ELEV1_FLR	elev1_flr
ELEV2_FLR	elev2_flr
ELEV_FLR	{elev_flr
FROSTFLOOR	frostfloor
GENERIC015	generic015
GENERIC015A	generic015a
GENERIC015B	generic015b
GENERIC015C	generic015c
GENERIC015D	generic015d
GENERIC015E	generic015e
GENERIC015F	generic015f
GENERIC015G	generic015g
GENERIC015H	generic015h
GENERIC015I	generic015i
GENERIC015V	generic015v
GENERIC109	generic109
GRATE1	{grate1
GRATE2	{grate2
GRATE2A	{grate2a
GRATE3A	{grate3a
GRATE3B	{grate3b
GRATE4A	{grate4a
GRATESTEP1	{gratestep1
GRATESTEP2	{gratestep2
GRATESTEP3	{gratestep3
GRID1	{grid1
GRID2	{grid2
LAB1_STAIR2A (12 characters)	lab1_stair2a
TNNL_FLR12	tnnl_flr12
TNNL_FLR12A	tnnl_flr12a
TNNL_FLR1A	tnnl_flr1a

Metal

Type	G
Sample footsteps
Sample hit sounds
Notes	n/a

Material Name	Textures
BABFL	-0babfl -1babfl -2babfl
BABTECH_C5	-0babtech_c5 -1babtech_c5 -2babtech_c5 -3babtech_c5
C1A1_FLR1	c1a1_flr1
C1A4_DOME3	c1a4_dome3
C2A3TURBINE1 (12 characters)	c2a3turbine1
C2A3TURBINE2 (12 characters)	c2a3turbine2
C2A3TURBINE3 (12 characters)	c2a3turbine3
C2A3TURBINE4 (12 characters)	c2a3turbine4
FIFTIES_CMP3 (12 characters)	fifties_cmp3a fifties_cmp3a2 fifties_cmp3b fifties_cmp3b2 fifties_cmp3c
FREEZER_FLR1 (12 characters)	freezer_flr1
GENERIC0150	(none)
GENERIC015N	generic015n
GENERIC015P	generic015p
GENERIC015R	generic015r
GENERIC015S	generic015s
GENERIC015T	generic015t
GENERIC015U	generic015u
GENERIC015V	generic015v
GENERIC015V2 (12 characters)	generic015v2
LAB1_STAIR2B (12 characters)	lab1_stair2b
LAB3_FLR2A	lab3_flr2a
LAB3_FLR2B	lab3_flr2b
OUT_QUNST11	out_qunst11
SILO2_P2	-0silo2_p2 -1silo2_p2 -2silo2_p2 -3silo2_p2 silo2_p2
SILO2_P2B	-0silo2_p2b -1silo2_p2b -2silo2_p2b -3silo2_p2b
SILO2_P3	-0silo2_p3 -1silo2_p3 -2silo2_p3 -3silo2_p3 silo2_p3
SILO2_P4	-0silo2_p4 -1silo2_p4 -2silo2_p4
SILO2_PAN2	-0silo2_pan2 -1silo2_pan2 -2silo2_pan2 -3silo2_pan2 -4silo2_pan2
SILO2_W1	silo2_w1
SILO2_W1A	silo2_w1a
SILO2_W2	silo2_w2
SILO2_WALL1	-0silo2_wall1 -1silo2_wall1 -2silo2_wall1 -3silo2_wall1 -4silo2_wall1 -5silo2_wall1 silo2_wall1

Computer / Electrical

Type	P
Sample footsteps
Sample hit sounds
Sample spark sounds
Notes	Computer material is exactly like Glass, except that it has a random chance to create a spark when hit. The step sound is Concrete.

Material Name	Textures
C1A1_GAD1	c1a1_gad1
C1A1_GAD2	c1a1_gad2
C1A1_GAD3	c1a1_gad3
C1A1_GAD4	c1a1_gad4
C1A1_GAD4A	c1a1_gad4a
C1A1_GGT8	c1a1_ggt8
C1A4_PAN1A	c1a4_pan1a
C1A4_PAN1B	c1a4_pan1b
C1A4_SWTCH1	c1a4_swtch1
C2A2_SATORB	c2a2_satorb
C2A4C2C	+0~c2a4c2c +1~c2a4c2c +2~c2a4c2c +3~c2a4c2c +4~c2a4c2c
C2A4W1B	~c2a4w1b
C2A4X_C1	c2a4x_c1
C2A4X_C3	c2a4x_c3
C2A4_CMP1	+0~c2a4_cmp1 +1~c2a4_cmp1 c2a4_cmp1
C2A4_GAD2	c2a4_gad2
C3A1_NRC2	c3a1_nrc2
C3A2A_W1D	c3a2a_w1d
C3A2A_W1E	c3a2a_w1e
C3A2A_W2D	c3a2a_w2d
C3A2A_W2E	c3a2a_w2e
CRETESTCH01A (12 characters)	+0~cretestch01a +1~cretestch01a
DRKMTLLGT1	+0~drkmtllgt1 +a~drkmtllgt1
DRKMTLT_WALL (12 characters)	drkmtlt_wall010 drkmtlt_wall07 drkmtlt_wall07a drkmtlt_wall07b drkmtlt_wall08 drkmtlt_wall08b
DRKMTL_SCRN2 (12 characters)	drkmtl_scrn2
DRKMTL_SCRN3 (12 characters)	drkmtl_scrn3
DRKMTL_SCRN4 (12 characters)	drkmtl_scrn4
ELEV1_DWN	(none)
ELEV1_PAN	+0~elev1_pan +1~elev1_pan +2~elev1_pan +3~elev1_pan +4~elev1_pan +a~elev1_pan
ELEV2_PAN	+0~elev2_pan +1~elev2_pan +2~elev2_pan +a~elev2_pan
FIFTIES_GGT8 (12 characters)	fifties_ggt8
FIFTIES_LGT2 (12 characters)	+0~fifties_lgt2 +a~fifties_lgt2
FIFTIES_MON1 (12 characters)	fifties_mon1 fifties_mon1b
FIFTIES_MON1B (12 characters)	fifties_mon1 fifties_mon1b
FIFTIES_MON2 (12 characters)	fifties_mon2 fifties_mon2b
FIFTIES_MON2B (12 characters)	fifties_mon2 fifties_mon2b
FIFTIES_MON3 (12 characters)	fifties_mon3 fifties_mon3b
FIFTIES_MON3B (12 characters)	fifties_mon3 fifties_mon3b
FIFTIES_MON4 (12 characters)	fifties_mon4
FIFTIES_PAN2 (12 characters)	fifties_pan2
FIFTS_LGHT01 (12 characters)	+0~fifts_lght01 +a~fifts_lght01
FIFTS_LGHT3	+0~fifts_lght3 +a~fifts_lght3
FIFTS_LGHT4	+0~fifts_lght4 +a~fifts_lght4
FIFTS_LGHT5	+0~fifts_lght5 +a~fifts_lght5
GENERIC105	generic105
GENERIC106	generic106
GENERIC107	generic107
GENERIC113	generic113
GENERIC114	generic114
GENERIC87A	generic87a
GENERIC88A	generic88a
GENERIC89A	generic89a
GYMLIGHT	+0~gymlight +agymlight +a~gymlight
LAB1_CMP	~lab1_cmp
LAB1_CMP1	+0~lab1_cmp1 +1~lab1_cmp1 +2~lab1_cmp1 +3~lab1_cmp1 +4~lab1_cmp1 +5~lab1_cmp1 +6~lab1_cmp1 +7~lab1_cmp1
LAB1_CMP2	+0~lab1_cmp2 +1~lab1_cmp2 +2~lab1_cmp2 +a~lab1_cmp2
LAB1_CMPM1	+0lab1_cmpm1 +1lab1_cmpm1 +2lab1_cmpm1 +3lab1_cmpm1 +4lab1_cmpm1
LAB1_CMPM2	+0lab1_cmpm2 +1lab1_cmpm2 +2lab1_cmpm2 +3lab1_cmpm2
LAB1_CMPM3	+0lab1_cmpm3 +1lab1_cmpm3 +2lab1_cmpm3 +3lab1_cmpm3 +4lab1_cmpm3 +5lab1_cmpm3
LAB1_CMPM4	+0lab1_cmpm4 +1lab1_cmpm4 +2lab1_cmpm4
LAB1_CMPM5	lab1_cmpm5
LAB1_CMPM6	lab1_cmpm6
LAB1_CMPM7	lab1_cmpm7
LAB1_CMPM8	lab1_cmpm8
LAB1_COMP1	lab1_comp1 ~lab1_comp1
LAB1_COMP10A (12 characters)	lab1_comp10a
LAB1_COMP10B (12 characters)	+0lab1_comp10b +1lab1_comp10b +2lab1_comp10b
LAB1_COMP10C (12 characters)	+0lab1_comp10c +1lab1_comp10c +2lab1_comp10c
LAB1_COMP10D (12 characters)	lab1_comp10d
LAB1_COMP10E (12 characters)	+0lab1_comp10e +1lab1_comp10e +2lab1_comp10e
LAB1_COMP2	lab1_comp2 ~lab1_comp2
LAB1_COMP2A	(none)
LAB1_COMP3	lab1_comp3 ~lab1_comp3
LAB1_COMP3A	lab1_comp3a ~lab1_comp3a
LAB1_COMP3B	lab1_comp3b ~lab1_comp3b
LAB1_COMP3C	lab1_comp3c ~lab1_comp3c
LAB1_COMP3D	lab1_comp3d ~lab1_comp3d
LAB1_COMP4	lab1_comp4 ~lab1_comp4
LAB1_COMP5	lab1_comp5 ~lab1_comp5
LAB1_COMP7	lab1_comp7 ~lab1_comp7
LAB1_COMP8	lab1_comp8 ~lab1_comp8
LAB1_COMP9A	+0lab1_comp9a +1lab1_comp9a +2lab1_comp9a
LAB1_COMP9A2 (12 characters)	+0lab1_comp9a2 +1lab1_comp9a2 +2lab1_comp9a2
LAB1_COMP9B	+0lab1_comp9b +1lab1_comp9b +2lab1_comp9b
LAB1_COMP9C	+0lab1_comp9c +1lab1_comp9c +2lab1_comp9c
LAB1_COMP9D	lab1_comp9d
LAB1_GAD2	+0~lab1_gad2 +a~lab1_gad2 lab1_gad2
LAB1_GAD3	+0~lab1_gad3 +1~lab1_gad3 +a~lab1_gad3 lab1_gad3
LAB1_GAD3B	+a~lab1_gad3b
LAB1_GAD4	lab1_gad4
LAB1_RADSCRN2 (12 characters)	lab1_radscrn2
LAB1_SW1	+0~lab1_sw1 +alab1_sw1 +a~lab1_sw1
LAB4_GAD3	lab4_gad3
LAB4_GAD4	lab4_gad4
LAB4_SWTCH	+0lab4_swtch +alab4_swtch
LAB_COMPM4	+0lab_compm4 +1lab_compm4 +2lab_compm4 +3lab_compm4 +4lab_compm4
LAB_CRT1	+0~lab_crt1 +1~lab_crt1
LAB_CRT10A	~lab_crt10a
LAB_CRT10B	~lab_crt10b
LAB_CRT10C	~lab_crt10c
LAB_CRT10D	~lab_crt10d
LAB_CRT2	+0~lab_crt2 +1~lab_crt2 +2~lab_crt2 +3~lab_crt2
LAB_CRT3	~lab_crt3
LAB_CRT4	~lab_crt4
LAB_CRT5	+0~lab_crt5 +1~lab_crt5 +2~lab_crt5 ~lab_crt5
LAB_CRT6	~lab_crt6
LAB_CRT7	+0~lab_crt7 +1~lab_crt7
LAB_CRT8	+0~lab_crt8 +1~lab_crt8
LAB_CRT9C	~lab_crt9c
LIGHT1	+0~light1 +a~light1
LIGHT2A	+0~light2a +a~light2a
LIGHT3A	+0~light3a +a~light3a ~light3a
LIGHT3B	~light3b
LIGHT3C	~light3c
LIGHT3D	~light3d
LIGHT3E	~light3e
LIGHT3F	~light3f
LIGHT4A	+0~light4a +a~light4a ~light4a
LIGHT5A	+0~light5a +a~light5a ~light5a
LIGHT5B	~light5b
LIGHT5C	~light5c
LIGHT5D	~light5d
LIGHT5E	~light5e
LIGHT5F	~light5f
LIGHT6A	+0~light6a +a~light6a
MEDKIT	+0medkit +amedkit
METALSTCH2	+0~metalstch2 +a~metalstch2
RECHARGEA	rechargea
SPOTBLUE	~spotblue
SPOTGREEN	~spotgreen
SPOTRED	~spotred
SPOTYELLOW	~spotyellow
TNNL_GAD1	+0tnnl_gad1 +atnnl_gad1
TNNL_GAD2	+0tnnl_gad2 +atnnl_gad2
TNNL_GAD4	tnnl_gad4
TNNL_LGT1	+0~tnnl_lgt1 +a~tnnl_lgt1
TNNL_LGT2	+0~tnnl_lgt2 +a~tnnl_lgt2
TNNL_LGT3	+0~tnnl_lgt3 +a~tnnl_lgt3
TNNL_LGT4	+0~tnnl_lgt4 +a~tnnl_lgt4

Slosh Liquid

Type	S
Sample footsteps
Sample hit sounds
Notes	Slosh sounds are also used when a player is standing in a liquid (brush entity with contents other than "air") up to foot height. If the water is knee-height, "wade" sounds are played instead. Note that textures beginning with ! are listed here; however, the engine converts these to world-water, so they actually have no sound in-game. There are no 12-character Slosh texture names in materials.txt.

Material Name	Textures
FLUID1A	!fluid1a fluid1a
FLUID1B	!fluid1b fluid1b
FLUID2	!fluid2 fluid2
FLUID3	!fluid3 fluid3
FLUID4	!fluid4 fluid4
GENERIC_114	generic_114
TOXICGRN	!toxicgrn toxicgrn
WATERBLUE	!waterblue
WATERF	+0waterf +1waterf +2waterf +3waterf +4waterf
WATERGREEN	!watergreen
WATERSILO	!watersilo
WATERSILO2	!watersilo2

Tile

Type	S
Sample footsteps
Sample hit sounds
Notes	Tile sounds have an extra footstep noise (five, instead of four) - the "squeaky" rubber-on-tile sound.

Material Name	Textures
C1A0_LABFLR	c1a0_labflr
C1A0_LABFLRB (12 characters)	c1a0_labflrb
C1A0_LABFLRC (12 characters)	c1a0_labflrc
C1A0_LABFLRD (12 characters)	c1a0_labflrd
C1A0_LABFLRE (12 characters)	c1a0_labflre
C1A2_FLR1	c1a2_flr1
C1A2_FLR2	c1a2_flr2
C2A4_FLR6	-0c2a4_flr6 -1c2a4_flr6 -2c2a4_flr6 c2a4_flr6
FIFTIES_F01	-0fifties_f01 -1fifties_f01 -2fifties_f01 -3fifties_f01
FIFTIES_F02	-0fifties_f02 -1fifties_f02 -2fifties_f02 -3fifties_f02
FIFTIES_F03	-0fifties_f03 -1fifties_f03 -2fifties_f03
FIFTIES_F03B (12 characters)	-0fifties_f03b -1fifties_f03b -2fifties_f03b -3fifties_f03b
FIFTIES_FLR01 (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR02 (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR02B (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR02C (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR03 (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR03B (12 characters)	fifties_flr01 fifties_flr02 fifties_flr02b fifties_flr02c fifties_flr03 fifties_flr03b fifties_flr04
FIFTIES_FLR5 (12 characters)	fifties_flr5
FIFT_BLOODFLR (12 characters)	(none)
FIFT_BLOODFLRA (12 characters)	(none)
LAB1_BLUX1	(none)
LAB1_BLUX1B	(none)
LAB1_BLUXFLR1 (12 characters)	lab1_bluxflr1 lab1_bluxflr1b
LAB1_BLUXFLR1B (12 characters)	lab1_bluxflr1 lab1_bluxflr1b
LAB1_C4003	lab1_c4003
LAB1_C4A001	lab1_c4a001
LAB1_C4B002	lab1_c4b002
LAB1_C4D2	lab1_c4d2
LAB1_CAB2	lab1_cab2
LAB1_FLOOR10 (12 characters)	(none)
LAB1_FLOOR2A (12 characters)	lab1_floor2a
LAB1_FLOOR2B (12 characters)	lab1_floor2b
LAB1_FLOOR3	lab1_floor3
LAB1_FLOOR4	lab1_floor4
LAB1_FLOOR5	lab1_floor5
LAB1_FLOOR6	lab1_floor6
LAB1_FLR3	lab1_flr3
LAB1_FLR4	lab1_flr4
LAB1_FLR4B	lab1_flr4b
LAB1_FLR4C	lab1_flr4c
LAB1_FLR4D	lab1_flr4d
LAB1_FLR5B	lab1_flr5b
LAB1_FLR5C	lab1_flr5c
LAB1_FLR5D	lab1_flr5d
LAB1_FLR6B	lab1_flr6b
LAB1_FLR6C	lab1_flr6c
LAB1_FLR6D	lab1_flr6d
LAB1_W8FLR1	lab1_w8flr1
LAB1_W8FLR1B (12 characters)	lab1_w8flr1b
LAB1_W8FLR1C (12 characters)	lab1_w8flr1c
LAB1_W8FLR1D (12 characters)	lab1_w8flr1d

Ventilation

Type	V
Sample footsteps
Sample hit sounds
Notes	There are no 12-character Vent texture names in materials.txt. Vent materials have only one "hit" sound.

Material Name	Textures
DUCT_FLR01	duct_flr01
DUCT_FLR01A	duct_flr01a
DUCT_FLR02A	duct_flr02a
DUCT_VNT	duct_vnt {duct_vnt
DUCT_VNT2	duct_vnt2 {duct_vnt2
DUCT_WALL01	duct_wall01
DUCT_WALL02	duct_wall02
DUCT_WALL03	duct_wall03
DUCT_WALL04	duct_wall04
SILO2_COR	silo2_cor

Wood

Type	V
Sample footsteps
Sample hit sounds
Notes	The step sound is Concrete.

Material Name	Textures
BCRATE02	bcrate02
BCRATE03	bcrate03
BCRATE04	bcrate04
BCRATE05	bcrate05
BCRATE06	bcrate06
BCRATE07	bcrate07
BCRATE08	bcrate08
BCRATE12	bcrate12
BCRATE14	bcrate14
BCRATE15	bcrate15
BCRATE16	bcrate16
BCRATE17	bcrate17
BCRATE18	bcrate18
BCRATE25	bcrate25
BCRATE26	bcrate26
CRATE01	crate01
CRATE02	crate02
CRATE02B	crate02b
CRATE03	crate03
CRATE04	crate04
CRATE05	crate05
CRATE06	crate06
CRATE07	crate07
CRATE08	crate08
CRATE08B	crate08b
CRATE09	crate09
CRATE09B	crate09b
CRATE09C	crate09c
CRATE10	crate10
CRATE11	crate11
CRATE12	crate12
CRATE13	crate13
CRATE19	crate19
CRATE20	crate20
CRATE21	crate21
CRATE22	crate22
CRATE23	crate23
CRATE24	crate24
CRATE25	crate25
CRATE27	crate27
FIFTIES_CCH1 (12 characters)	fifties_cch1 fifties_cch1b
FIFTIES_CCH2 (12 characters)	fifties_cch2 fifties_cch2b
FIFTIES_CCH3 (12 characters)	fifties_cch3 fifties_cch3b
FIFTIES_CCH4 (12 characters)	fifties_cch4 fifties_cch4b
FIFTIES_DR1K (12 characters)	fifties_dr1k
FIFTIES_DR2	fifties_dr2
FIFTIES_DR6	fifties_dr6
FIFTIES_DR6A (12 characters)	fifties_dr6a fifties_dr6a2
FIFTIES_DR7	fifties_dr7
FIFTIES_DR8	fifties_dr8
FIFTIES_DR9	fifties_dr9
FIFTIES_DSK1 (12 characters)	fifties_dsk1
OUT_CAC1	out_cac1
OUT_CAC2	out_cac2
OUT_SLAT01	out_slat01
OUT_WD	out_wd