$bumpmap

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

The above material in-game.

The $bumpmap VMT parameter specifies a texture that will provide three-dimensional lighting information. The texture is known as a Normal Map.

Basic syntax

$bumpmap <texture>

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

Additional parameters

$bumptransform <matrix>

Transforms the bumpmap texture. Requires DirectX 9 or above.

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 ?]

$bumpscale <float>

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

$bumpframe <integer>

Frame number to use from an animated texture.

$nodiffusebumplighting <bool>

See Dealing with fillrate issues. Only relevant when using LightmappedGeneric.

$forcebump <bool>

Forces DirectX 8 cards to render the bump map. They normally don't for performance reasons.

$bumpoffset <?>

Todo: dx8 version of center?

$bumpmap2 <texture>

$bumpframe2 <integer>

Used by the WorldVertexTransition shader in blend materials that display two textures. DirectX 9 required.

See also

• Normal Map
  • Normal Map Creation
  • Normal Map Creation in The GIMP