$bumpmap

The $bumpmap VMT parameter specifies the VTF texture to use for the 'bump' or normalmap of the material surface.

Basic syntax

"$bumpmap" <texture>

• <texture> is the name of the VTF texture to be used as the bumpmap/normalmap.
• The .vtf file extension is not used in VMT texture references.
• The name can be preceeded by the filepath relative to the game_directory/materials folder.
• Example: "$bumpmap" "Path/Texture1_normal"

Additional Parameters

$bumpscale

"$bumpscale" float

• Scales the $bumpmap by the float value.
• Default value is 1.
• Note: I'm not sure if this is a shader parameter. (Likely an old DirectX 8 fallback shader, later replaced by the DirectX 8 version of the $bumptransform parameter.)

$bumpframe

"$bumpframe" <integer>

• Frame number for the bumpmap texture.
• The default is 0.

$bumptransform

"$bumptransform" <matrix>

• Transforms the bumpmap texture.
• The default is "center .5 .5 scale 1 1 rotate 0 translate 0 0".

$bumpmap2

"$bumpmap2" <texture> 

• Used by the WorldTwoTextureBlend shader to blend materials on Displacement surfaces (eg terrain).
• The percentage blend of each of the two textures is defined by alpha painting in Hammer.
• DirectX 9 required.

$bumpframe2

"$bumpframe2" <integer>

• Frame number for $bumpmap2.
• DirectX 9 required.
• Default value is 0.

$nodiffusebumplighting

"$nodiffusebumplighting" <boolean>

• If set to 1, no diffuse bump lighting will be done.
• Default setting is 0.
• See Controlling Geometry Visibility and Compile Times#Dealing with fillrate issues.
• Requires LightmappedGeneric shading.

$forcebump

"$forcebump" <boolean>

• If set to 1, always does bumpmapping (even if the graphics card doesn't say it can handle it).
• Default setting is 0.
• Requires DirectX 8.

See Also

• Tutorial Normal Map Creation in The GIMP