$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.

In materials

• $surfaceprop is not linked to any particular shader, so can be used at any time.

In models

• A model's surface prop will override its material's
• 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