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Revision as of 09:15, 4 March 2014 by Pacguy19 (talk | contribs) (clarification)
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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 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.png 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.

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