$bumpmap
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A material's albedo (left) compared to its bump map.
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 normal mapping.
Basic syntax
$bumpmap <texture>
LightmappedGeneric { $basetexture brick/brickwall021a $surfaceprop brick $bumpmap brick/brickwall021a_normal }
Additional parameters
$bumptransform <matrix>- Transforms the bump map texture. Requires DirectX 9 or above.
- The default position is center .5 .5 scale 1 1 rotate 0 translate 0 0.
- center defines the point of rotation. Only useful if rotate is being used.
- 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.
- rotate rotates the texture counter-clockwise in degrees. Accepts any number, including negatives.
- 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 bump map by the given value in DirectX 8.
$bumpframe <integer>- The frame to start an animated bump map on.
$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.
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!)
Known Problems
If you are trying to view your normal map on a model in the model viewer the normal map will not show up. This is a problem with the model viewer. To view the normal map in action you will need to load it up in a map.