$subd
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Tip: The smoothness can be adjusted using the console variable
Tip: It works only in Alien Swarm and Source Filmmaker.
Confirm:Works in games other than Alien Swarm and Source Filmmaker?
Warning: Studiomdl will crash if any triangles are present in the model.
Important: $subd must be stated before the $model or $body you want to apply it to
$subd is a QC command available in all 
Source games since 
Alien Swarm. It is used to mark a model to be tessellated in run-time. This can be used to make models appear smoother than they actually are.
It also is needed to make $displacementmap work.
Tip: The smoothness can be adjusted using the console variable mat_tessellationlevel <1-16>, with higher values rendering more polygons. Tip: It works only in Alien Swarm and Source Filmmaker. Confirm:Works in games other than Alien Swarm and Source Filmmaker?Warning: Studiomdl will crash if any triangles are present in the model. $subd only works with quads and n-gons with more than 3 edges. This effectively makes the SMD format unusable, meaning you have to use the DMX format, as SMD only supports triangles. The SMD format can still be used for animations, though. Syntax
$subd
Important: $subd must be stated before the $model or $body you want to apply it to
Example
$modelname "example/subdivision.mdl" $cdmaterials "example/subdivision" $subd $body test "subdivison.dmx" $sequence idle "subdivision_idle.smd"