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Moss shader example, for $moss_texture used xen/moss00_d.

This shader was created during development of Xen for Black Mesa and is designed to simulate presence of moss on surface. Instead of using texture itself for moss, this shader takes color that most of the texture consists of and then applies color to surface according to the parameters specified in .vmt.

Warning: This shader was never used by developers in

Black Mesa campaign, may be incomplete and incompatible with other shaders, use carefully.

Todo: Take the rocks model and materials from the game files and document how this shader works with models.

← Black Mesa Level Creation

Parameters and Effects

$moss_enable <integer>

Toggle moss between enabled and disabled state. 1 - enabled, 0 - disabled.

$moss_texture <texture>

Defines a diffuse texture that will use moss for color.

Examples.
`metal/metalgrate013a` `dev/dev_ram_512_red` `xen/moss00_d`

$moss_ref_direction <vector3>

Defines direction for moss, the numbers can be negative.

Examples.
`$moss_ref_direction "[1 0 0]"` `$moss_ref_direction "[0 1 0]` `$moss_ref_direction "[0 0 1]`

$moss_angle_theta <float>

Inner angle value for displacement surfaces. Results depend on $moss_angle_phi and $moss_angle_falloff.

Examples.
`$moss_angle_theta 1, $moss_angle_phi 10, $moss_angle_falloff 0.5.` `$moss_angle_theta 5, $moss_angle_phi 10, $moss_angle_falloff 0.5.` `$moss_angle_theta 10, $moss_angle_phi 10, $moss_angle_falloff 0.5`

$moss_angle_phi <float>

Outer angle value for displacement surfaces. Results depend on $moss_angle_theta and $moss_angle_falloff.

Examples.
`$moss_angle_theta 50, $moss_angle_phi 50, $moss_angle_falloff 0.5.` `$moss_angle_theta 50, $moss_angle_phi 100, $moss_angle_falloff 0.5.` `$moss_angle_theta 50, $moss_angle_phi 200, $moss_angle_falloff 0.5.`

$moss_angle_falloff <float>

Falloff value for displacement surfaces. Results depend on $moss_angle_theta and $moss_angle_phi.

Examples.
`$moss_angle_theta 10, $moss_angle_phi 200, $moss_angle_falloff 0.5.` `$moss_angle_theta 10, $moss_angle_phi 200, $moss_angle_falloff 10` `$moss_angle_theta 10, $moss_angle_phi 200, $moss_angle_falloff 500`