$detail specifies a greyscale texture with which Source will add high-resolution detail when the material is viewed up close, by darkening the albedo appropriately. It is very effective for increasing the apparent resolution of a texture, and was used extensively in Episode Two.
You will probably want to use at least
$detailscale (see below) as well.
- Fits the detail texture onto the material the given number of times. Generally around 7 or 8 for a 128px detail texture; default is 4.
- Intensity of the detail's darkening of the albedo. Effectively an
- Enable to make the detail texture darken the albedo more.
$detailtint "<RGB matrix>"
- Modifies the colour of the detail texture.
- The frame to start animated detail texture on. Requires DX9.
- To do: Something to do with masking
$detail's alpha channel? Requires DX9.
Valve's detail textures
Valve's stock detail textures (available in OB only) are best used with the following pre-configured values:
$detail detail\noise_detail_01 // e.g. for brickwork, concrete... $detailscale 7.74 $detailblendfactor 0.8 $detailblendmode 0
$detail detail\metal_detail_01 $detailscale 4.283 $detailblendfactor .65 $detailblendmode 0
$detail detail\rock_detail_01 $detailscale 11 $detailblendfactor 1 $detailblendmode 0
$detail detail\plaster_detail_01 $detailscale 6.783 $detailblendfactor .8 $detailblendmode 0
There is also
detail\wood_detail_01, but no stock material seems to use it.