$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, including ragdoll limbs, 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.

$automass

Tells StudioMDL to calculate the mass of the model (based on the volume of the collision SMD and the density/thickness of the material defined in its prop_data).

$concave

By default StudioMDL will generate a single convex hull by bridging any concavities in a collision SMD. You can create a concave hull by including multiple, overlapping convex meshes in your SMD, and using the $concave command to tell StudioMDL to preserve concavities by using multiple convex pieces. The resulting hull structure is a bit like a Rigid ragdoll.

$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 complex collision model.

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

$masscenter <vector|offset>

Override the center of mass, in local coords.

$inertia <int|scale>

Inertia scale.

$damping <int|scale>

Linear damping scale.

$rotdamping <int|scale>

Rotational damping scale.

$drag <int|scale>

Scales air resistance.

Example

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

See also

• VPhysics
• Physics and Ragdolls
• $collisionjoints