A system shader designed to 'caulk' or seal a map. In-game, it is a transparent solid texture. It is best applied to all surfaces which a player will be unable to see while in-game. This texture generate no draw surfaces.

Surfaces with this shaders make invisible walls which clips movement of players. Do not affects footsteps (footstep tracing skips clipsurfaces to get real material player standing on).

Like Clip but only clips NPC movement.

PlayerClip + MonsterClip.

Normally brush entities have no origin. Center of brush covered by this textures will set origin of it's parent BModel. This origin is used for movement (path spots) and rotation.

Black wall, hides any stuff behing it. Dont cast a shadow.

Black wall on steroids, this also hides any transparent entities, marks, effects.

Invisible, sets brush contents to water. Also used on covering junction sides of water brushes (when making a long river). Water damage the player at slight rate.

Invisible, sets brush contents to swamp. Swamp slows down player and damage at slight rate when he moves.

Invisible, sets brush contents to lava. Also used on covering junction sides of lava brushes. Lava damages player at hight rate (even in mist form), almost impossible to walk.

World brush with this texture will make boundaries of entity static lighting. There is no other use.

Black wall but casts shadows from static lights.

Invisible surface that blocks lighting.

Same as lightblock but blocks lighting from inside.

This brush splits visibility data making more portals. Rarely used to enhance portal culling.

Caulk that doesnt block visibility data.

Invisible wall that cast realtime shadows. Weird.

This invisible texture is inaccessible from texture window. It is ised on collision meshes to define BIH support with no reatime shadows.

BIH support + playerclip.

BIH support + cast realtime shadows.

This texture should be used with "collision" mesh only used by ODE.

All triggers should be marked with this material.

Material to cover invisible rooftops on func_roof.

Visible materials to mark various stuff, like light glares, zones.