VMT Param EGSMShader

// Material will use "ShaderName" only when EGSM is installed
UnlitGeneric
{
    "EGSMShader" "ShaderName"
}    

// Will only use params defined inside "EGSMShader" { ... }
UnlitGeneric
{
    "EGSMShader"
    {
        "Shader" "ShaderName"
        "$basetexture" "hunter/myplastic"
    }
}   

No EGSM

EGSM installed