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. Note: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
	cr_matmetal
	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
	cr_matcard
	cull
	leaf
	loc
	skycull

Day of Defeat only

Image	Name	Usage / Notes
	cr_mathvymetal
	cr_matsand
	cr_matwood
	NULL

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
	BOUNDINGBOX
	CLIP	See Clip texture
	CLIPBEVEL
	CLIPBEVELBRUSH
	CLIPHULL1
	CLIPHULL2
	CLIPHULL3
	CONTENTEMPTY
	CONTENTWATER
	HINT
	NOCLIP
	NULL
	ORIGIN	Treated as the origin point for rotating entities, such as func_door_rotating.
	SKIP
	sky	Used for displaying the skybox. Note: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