$collisionmodel
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(Redirected from $rotdamping)
Contents
The QC command $collisionmodel
is used to embed a static collision mesh in a model, for use in VPhysics calculations. Animated models (including one that will become ragdolls) should use $collisionjoints
instead.
Warning: Collision meshes should have extremely few polygons. See Collision mesh for examples.
Warning: Concave collision meshes should not have meshes overlapping.


vcollide_wireframe 1
to view collision meshes in-game.Syntax
$collisionmodel <collision mesh SMD/DMX> { <options> }
Options
-
$mass <float|kilograms>
- Manually set the mass of the model, in kilograms.
Tip:By default, the Player can +USE pick up 35KG max. The gravgun can pick up 250KG max. The portal gun can pick up 85KG max.
$automass
- Calculate the mass of the model based on the volume of the collision model and the material defined in its prop_data.
-
$concave
- By default, studiomdl will generate a single convex hull by 'shrinkwrapping' any concavities. You can create a concave hull by including multiple convex shapes (potentially overlapping) in your collision model, smoothing the hulls’ shading, and passing this command.
$maxconvexpieces <int>
- By default, the model compiler limits a concave collision model to twenty convex pieces. This command can be used to override the limit if you are creating an Costly collision model.
Note:Introduced with the Orange Box. In the Ep1 engine, run studiomdl with
-fullcollide
instead. -
$masscenter <vector|offset>
- Override the center of mass, in local coords.
-
$inertia <normal>
- Inertia scale.
-
$damping <float>
- Linear damping scale.
-
$rotdamping <float>
- Rotational damping scale.
Warning: This affects the pull of gravity on the model and if abused can make it appear to float gently through the air. Valve recommends using "friction" instead.
-
$drag <normal>
- Scales air resistance.
-
$addconvexsrc <file> "offset pos[ <float> <float> <float> ] angle[ <float> <float> <float> ] scale[ <float> ] concave"
- Adds a convex model onto the collision model with the specified position, angle, and scale. The "concave" option is optional.
Note:It must be formatted EXACTLY like this!
Example
$collisionmodel "tree_deciduous_01a_physbox.smd" { $mass 350.0 $concave }