$collisionmodel

The QC command $collisionmodel is used to embed a non-animated collision mesh in a model, for use in VPhysics calculations.

Tip:Use vcollide_wireframe 1 to view collision meshes in-game.

Tip:If your model has moving parts that need to collide, use $collisionjoints.

Warning:Collision meshes should be extremely low-poly in comparison to body meshes, and even lod meshes. See collision mesh.

Usage

$collisionmodel <collision mesh SMD>
{
    <options>
}

Options

$mass <float|kilograms>

Manually set the mass of the model.

Todo: Presumably this has some use outside physics simulation?

$automass

Automatically compute the mass of the model. The calculation takes into account the density/thickness of the material defined by $surfaceprop and/or prop_data, as well as the volume of the collision SMD itself.

$concave

A collision model must be a convex shape, but you can create concave shapes by including multiple meshes in the same model. $concave tells studiomdl that this is what you want it to do, rather than make a single convex hull by bridging any gaps.

$maxconvexpieces <int>

By default, studiomdl limits a concave collision model to twenty convex pieces. This command can be used to override the limit - for instance if you are creating an unusually large model.

Note:Introduced with the Orange Box. In the Ep1 engine, run studiomdl with -fullcollide when compiling instead.

$masscenter <X Y Z offset?>

Override the center of mass, in local coords.

$inertia <scale?>

Inertia scale.

$damping <scale?>

Linear damping scale.

$rotdamping <scale?>

Rotational damping scale.

$drag <scale?>

Scales air resistance.

Example

$collisionmodel "tree_deciduous_01a_physbox.smd"
{
	$mass 350.0
	$concave
}

See also

• VPhysics
• Physics and Ragdolls
• $collisionjoints