Tool textures (GoldSrc)

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HALFLIFE.WAD

Image	Name	Usage / Notes
	{BLUE	An invisible brush face if attached to func_wall or similar brush entity with rendermode solid. Note: Faces using this texture are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	{INVISIBLE	Functions same as {BLUE.
	AAATRIGGER	Used for trigger brush entities.
	BLACK	A plain black texture for unlit areas, such as the bottom of deep pits. Note: Faces using this texture are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	CLIP	See Clip texture
	ORIGIN	Treated as the origin point for rotating entities, such as func_door_rotating.
	SKY	Used for displaying the skybox. Warning: VHLT expects the `sky` tool texture to be lowercase and will not compile skies correctly if the tool texture does not fit these critera.
	TRANSLUCENT
	WHITE

HLBASICS.WAD

HLBASICS.WAD is found in Counter-Strike: Condition Zero and Day of Defeat, and is used to avoid needing to load HALFLIFE.WAD for maps that don't use base Half-Life 1 textures. ^[Clarify] Some of these are also in Condition Zero Deleted Scenes, via RITUAL_STANDARD.WAD, as well as in Counter-Strike: Condition Zero, via CZRITUAL_STANDARD.WAD.

Image	Name	Usage / Notes
	{blue	An invisible brush face if attached to func_wall or similar brush entity with rendermode solid. Note: Faces using this texture are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	aaa_1
	aaa_2
	aaa_3
	aaa_hurt
	aaa_multi
	aaa_once
	aaa_push
	aaa_push2
	AAATRIGGER	Used for trigger brush entities.
	clip	See Clip texture.
	cr_matleaf	Makes leaf sounds when walked on, if present in `sound/materials.txt`. Tie to a `func_wall` with `renderamt` set to `0` (aka invisible) to use as a clip brush for leafy props. Note: Invisible faces are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	cr_matmetal	Makes metal sounds when walked on, if present in `sound/materials.txt`. Tie to a `func_wall` with `renderamt` set to `0` (aka invisible) to use as a clip brush for metalic props. Note: Invisible faces are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	hint
	ORIGIN	Treated as the origin point for rotating entities, such as func_door_rotating.
	SKIP
	sky	Used for displaying the skybox.

Condition Zero only

Image	Name	Usage / Notes
	bark
	black
	cr_matbark	Makes wood sounds when walked on, if present in `sound/materials.txt`. Tie to a `func_wall` with `renderamt` set to `0` (aka invisible) to use as a clip brush for metalic props. Note: Invisible faces are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	cr_matcard	Unused, likely intended for non-existent "cardboard" material.
	cull
	leaf
	loc
	skycull

Day of Defeat only

Image	Name	Usage / Notes
	cr_mathvymetal	Identical to CR_MATMETAL. Bug: Likely intended to be used for "Heavy Metal" material, available in DoD's `sound/materials.txt`, but not used by this texture. Use IR_PIPEM8 instead.
	cr_matsand	Makes sand sounds when walked on, if present in `sound/materials.txt`. Tie to a `func_wall` with `renderamt` set to `0` (aka invisible) to use as a clip brush for metalic props. Note: Invisible faces are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	cr_matwood	Makes wood sounds when walked on, if present in `sound/materials.txt`. Tie to a `func_wall` with `renderamt` set to `0` (aka invisible) to use as a clip brush for metalic props. Note: Invisible faces are still have lightmap a created for them, despite not being noticeable. Increase texture scale to 4.0 or higher to avoid wasting allocblock.
	NULL	Identical to ZHLT's NULL texture.

ZHLT.WAD

ZHLT.WAD is used for the additional features provided by the ZHLT and VHLT compilers. It does not come with any vanilla first-party GoldSrc title, but instead comes with ZHLT/VHLT.

Image	Name	Usage / Notes
	AAATRIGGER	Used for trigger brush entities.
	BEVEL
	Black_HIDDEN	Identical to NULL, but has a lightmap.
	BOUNDINGBOX
	CLIP	See Clip texture
	CLIPBEVEL
	CLIPBEVELBRUSH
	CLIPHULL1
	CLIPHULL2
	CLIPHULL3	Like CLIP, but only affects
	CONTENTEMPTY
	CONTENTWATER	Not drawn in game, and inverts the normals of all other faces of the brush. Usually used to simulate volumetric lighting.
	HINT
	NOCLIP	Not drawn in game, and disables collision for all faces on the brush.
	NULL	Not drawn in game, seals leaks, and is skipped by HLRAD. Blocks visibility if used on all surfaces of the same brush. Optimally, every face that can't be seen during normal gameplay should have this texture. Note: While no lightmap data is generated on NULL faces, NULL brushes still cast shadows, unless tied to a func_wall. Note: Despite common misconception, it is not necessary to use NULL on faces that don't touch visleaves, as these are automatically removed by HLBSP. This means faces that are outside the map and faces that are flush with another one.
	ORIGIN	Treated as the origin point for rotating entities, such as func_door_rotating.
	SKIP
	sky	Used for displaying the skybox. Warning: VHLT expects the `sky` tool texture to be lowercase and will not compile skies correctly if the tool texture does not fit these critera.
	SOLIDHINT