$cdmaterials
From Valve Developer Community
The QC command $cdmaterials defines the folders in which the game will search for the model's materials, relative to <game>/materials/.
Tip: Filenames are defined by the $body SMD(s).[edit]
Syntax
$cdmaterials <path> <second path> ...
[edit]
Example
$modelname "weapons/shell.mdl" $cdmaterials "models/weapons/" $body shell "shell_ref.smd" $sequence idle "shell_idle.smd"

