SurfaceGGX

SurfaceGGX is a material shader available in the following Source engine games: Day of Infamy , Insurgency . It was first introduced in Day of Infamy and back ported to Insurgency. It supports PBR.

Bug:This shader won't receive light properly from env_projectedtextures like the player's flashlight, instead making the material appear pure black. If the player is allowed to use a flashlight, the best case scenario is to only use this shader on props in lit up areas. This shader applied to weapon view models is safe from this however.  [todo tested in ?]

Supported Parameters

$basetexture <texture>

Diffuse texture.

$bumpmap <void>

Normal mapping.

Bug:Animated bump maps aren't possible as the shader lacks the $bumpframe parameter.

$color <void>

Color tinting.

$detail <void>

Detail texturing.

$envmap <void>

Specular reflections.

$alphatest <void>

Alpha testing.

Metalness Parameters

$metal <boolean>

Enables use of the green channel of $phongexponenttexture.

$phongexponenttexture <texture>

Despite the name, this is a mask that defines the metalness of the material.

Specular/Gloss Parameters

$pbr <boolean>

Enables PBR reflections.

$masks <texture>

A mask for specular and glossiness. $pbr must be enabled to work.

Misc. Parameters

$fuzz <boolean>

Enables a asperity/fuzz scattering pass on the material.

$fuzzmultiplier <float>

Multiplier for the fuzz effect, default is 1.0.

$roughnessmultiplier <float>

Multiplier for roughness.

Todo: More detail, what is roughness?

$subsurfacescattering <boolean>

Enables subsurface scattering on the material.

Todo: More detail.

$disableenvmap <boolean>

Enabling disables $envmap reflections. The shader will use $envmap by default even if it isn't specified, unless this is enabled.

Configuring the masks

$phongexponenttexture

The RGB channels of $phongexponenttexture is configured as follows:

Channel	Data
Red	Glossiness (roughness inverted)
Green	Metalness inverted
Blue	Sub-surface scattering mask

$metal must be set to 1 in order to use the green channel.

Note:$fuzz and $detailnormal use the inverse of the blue channel.

$masks

The RGB and alpha channels of $masks is configured as follows:

Channel	Data
RGB	Specular tint
Alpha	Glossiness

$pbr must be enabled to make use of $masks.

See also

• WorldGGX, similar shader used for brushes and displacements.