$controller

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Allows the bone to be controlled from game code. The axis can be X Y or Z. You can prefix L on the axis to specify this controller loops back around to the start when it ends, and/or suffix R to specify the start/end numbers are in  radian units instead of degrees.

If you need a controller over more then one axis you need to specify a new controller for each axis.

Description

$controller number "bone-name" axis start-offset end-offset

Example

$modelname "npcs/robot.mdl"
$cdmaterials "models/npcs/"
$model "Robot" "robot.smd"
$controller 1 "jaw" X 0 20
$sequence "idle" "idle.smd"