$surfaceprop

The $surfaceprop command links the surface of either a material or model to a set of physical properties, including:

• What sounds are emitted during collisions
• What effects are emitted when the surface is shot
• Mass, buoyancy, bounciness...
• The effect of the surface on nearby sounds (reverberation, echo, absorption...)

Syntax

Syntax is the same for both models and materials:

$surfaceprop <name>

Names are defined in <game>\scripts\surfaceproperties_manifest.txt (and the files it references). For a list of Valve's stock props, see Material surface properties.

Bug:Left 4 Dead does not display bullet decals properly on brick surfaces. If you're okay with the decals and visual effects being inappropriate, you can change the $surfaceprop to something else to fix it.  [todo tested in ?]

In materials

• $surfaceprop is not linked to any particular shader, so it can be used at any time.
• Only brush based shaders require this parameter. $surfaceprop must always be defined within the collision property of the QC file if anything other than the default is to be used, however.

In models

• It is unclear whether a model's mass is calculated from $surfaceprop or prop_data
• Surface props can be defined for individual bones with $jointsurfaceprop

Addtion links

• Material_surface_properties