func_friction
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This entity is obsolete. Its use is discouraged. It may only exist/function in older engine branches.
func_friction is a point entity available in 
Black Mesa (mod) and 
Garry's Mod.
Warning:
- The {{{game}}} parameter is inconsistent with the name defined by the {{Black Mesa 2012}} template. This can most likely be fixed by setting the value of the {{{game}}} parameter to Black Mesa (mod).
If a parameter is consistent but you're still seeing this warning, it may be an issue with the template itself. Please discuss it on the template's talk page.
Initially, this entity should allow you to create an area of low friction (to simulate an icy area for example). However, this entity doesn't work at all, it is also unused and removed in Steam versions of the game. There are many other ways to have areas with low friction, $surfaceprop parameter for example.
Keyvalues
- Name (targetname) <string>[ Edit ]
- The name that other entities refer to this entity by, via Inputs/Outputs or other keyvalues (e.g.
parentnameortarget).
Also displayed in Hammer's 2D views and Entity Report.See also: Generic Keyvalues, Inputs and Outputs available to all entities
- Friction Percent (modifier) <float>
- Set the friction to this percent of the regular friction.