$bumpmap

A material's albedo (left) compared to its bump map.

The above material in-game.

The $bumpmap VMT parameter specifies a texture that will provide three-dimensional lighting information for a material. The texture is a bump map, but the process it is used for is called normal mapping. The two terms are often used interchangeably, however.

Warning:$bumpmap will disable prop_static's per-vertex lighting in every Source game but . Not enough data is stored in the vertices for normal mapping, so the engine has no choice but to fall back.

Note:

• In the Water shader, $bumpmap is for a DX8 du/dv map. Use $normalmap instead.
• The $bumpmap parameter is not compatible with decal textures.

Basic syntax

LightmappedGeneric
{
	$basetexture	brick/brickwall021a
	$surfaceprop	brick
	$bumpmap		brick/brickwall021a_normal
}

Additional parameters

$bumptransform <matrix> (DX9 SM2)

Transforms the bump map texture.

Todo: Does this actually require DX9? Present in DX8 fallback shaders.

The default position is center .5 .5 scale 1 1 rotate 0 translate 0 0.

1. center defines the point of rotation. Only useful if rotate is being used.
2. scale fits the texture into the material the given number of times. 2 1 is a 50% scale in the horizontal X axis while the vertical Y axis is still at original scale.
3. rotate rotates the texture counter-clockwise in degrees. Accepts any number, including negatives.
4. translate shifts the texture by the given numbers. .5 will shift it half-way. 1 will shift it once completely over, which is the same as not moving it at all.

Note:All values must be included!

Bug:Scaling the texture may cause odd issues where the Texture Lock tool in Hammer will not actually lock the texture in place.  [todo tested in ?]

Bug:Rotating textures applied on brushes will rotate around the map origin (confirm: Orangebox engine only?). A fix for this is to change the center position in the VMT to the brush's origin.  [todo tested in ?]

$ssbump

Flags the bump map texture as being self-shadowing. Click for more details.

$bumpscale <float> (DX8)

Scales the bump map by the given value in DirectX 8.

Todo: Does this actually exist? Seemingly not present in DX8 fallback shaders.

$bumpframe <integer>

The frame to start an animated bump map on.

$nodiffusebumplighting <bool>

Stops the bump map affecting the lighting of the material's albedo, which help combat overdraw. Does not affect the specular map.

Bug:Does not function in Orange Box builds and later.  [todo tested in ?]

$forcebump <bool> (DX8)

If 0, use bumpmapping if the card says it can handle it. If 1, always force bumpmapping on.

$bumpoffset <?>

Confirm:DX8 version of center?

Todo: Does this actually exist?

$bumpmap2 <texture> (DX9 SM2)

$bumpframe2 <integer> (DX9 SM2)

$bumptransform2 <matrix> (DX9 SM2)

Used by the WorldVertexTransition shader in blend materials that display two textures.

Console commands

mat_fastnobump <bool>

Quickly enables/disabled normal mapping.

mat_normalmaps <bool>

Displays the bump map texture of all materials that have one in place of their albedo.

(Yes, these two commands have bump and normal the wrong way around!)

See also

• $ssbump
• Bump map, for technical details and a guide to creation.