$envmapmask

From Valve Developer Community

$envmapmask defines a specular mask, which affects how strongly each pixel of a material reflects light from the $envmap. The mask should be a greyscale image in which entirely reflective areas are white and entirely matte areas are black

VMT syntax example

$envmapmask <texture>

VertexLitGeneric
{
	$envmap			env_cubemap
	$envmapmask		"props/tvscreen_test"
}

Additional parameters

$envmapmasktransform <matrix>

Adjusts UV mapping of the specular mask.

DirectX 8 and below use $envmapmaskscale instead.

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 X axis.
3. rotate rotates the texture anti-clockwise. Accepts any number, including negatives.
4. translate shifts the texture by the given number of heights/widths. '.5' will shift it half-way.

Note:All values must be included!

$envmapmaskscale <float>

Scales the specular mask by the given value.

See also $envmapmasktransform, above.

Requires DirectX 8.

$envmapmaskframe <integer>

The frame to start an animated specular mask on.

Alternative methods

Rather than creating a whole new texture just for a specular mask, you can use the alpha channel of either the $basetexture or $bumpmap. Note that this unfortunately won't reduce the overall amount of data on-disk or in-memory.

If you do use these commands, transformations and other such parameters applied to the base texture/bump map will also apply to the specular mask.

$basealphaenvmapmask <bool>

Use the alpha channel of $basetexture as the specular mask.

When putting your specular map in the alpha channel you will have to invert it, or else it will work the wrong way round.

$normalmapalphaenvmapmask <bool>

Use the alpha channel of $bumpmap as the specular mask.

This must be used if the model material has a bump map.

See Also

• $basetexture
• $envmap (environment map)
• $phong (diffuse reflection)
• $selfillum