Name
Type
Typical Range
Description
Name
adhesionVelocity
Type
float
Typical Range
0.1- 10
Description
Deprecated variable, will not affect anything from now on (0.6.0+)
Name
staticFrictionCoefficient
Type
float
Typical Range
0.1 - 2
Description
Static friction keeps you in the same place when you are stopped on a hill. This friction coefficient is usually higher than sliding friction.
Name
slidingFrictionCoefficient
Type
float
Typical Range
0.1 - 1.5
Description
Sliding friction coefficient determines how much friction force occurs once the node has started sliding. The friction does not transition instantly from static to sliding friction, but gradually moves toward sliding friction as the sliding velocity increases. To control this effect, see “stribek velocity” below.
Name
hydrodynamicFriction
Type
float
Typical Range
0 - 1.5
Description
This friction coefficient is used to add some extra friction as sliding velocity increases. This is useful for replicating fluid viscosity or speed sensitive friction effects of somewhat fluid-like ground types (soft dirt, sand, mud). If you decide that you’ll simulate the fluid like behavior with the more complex fluid physics below, then just set this to 0.
Name
stribeckVelocity
Type
float
Typical Range
N/A
Description
The stribeck velocity defines the shape of the static-sliding friction curve. A small stribeck velocity will cause an abrupt change from static to sliding friction, a large stribek velocity will make a slower transition that will feel more “sticky”. The inverse (1 / stribeck velocity) is often described as “stribeck coefficient”. Reference values can be found in either form, so make sure not to confuse them when looking up reference data.
Name
strength
Type
float
Typical Range
0 - 2
Description
This parameter raises or diminishes surface friction in a generic way. It is here so as to be able to do quick calibrations of friction. Start with having this to 1.0 and after tuning the rest of the surface variables, come back and play with this.
Name
defaultDepth
Type
float
Typical Range
N/A
Description
This parameter sets the depth of the surface fluid in meters.
Name
fluidDensity
Type
float
Typical Range
N/A
Description
Density of the surface fluid (kg/m^3).
Name
flowConsistencyIndex
Type
float
Typical Range
N/A
Description
Determines the speed sensitive drag effect. If <1 then fluid is Pseudoplastic (ketchup, whipped cream, paint) and has less drag coefficient at high speeds. If =1 then fluid is Newtonian, having equal drag coefficient at any speed. If >1 then fluid is Dilatant, having higher drag coefficient at high speeds.
Name
flowBehaviorIndex
Type
float
Typical Range
N/A
Description
N/A
Name
dragAnisotropy
Type
float
Typical Range
N/A
Description
Upwards/Downwards drag anisotropy. This creates a lifting or sinking effect on the node when it slides through the surface fluid.
Name
skidMarks
Type
bool
Typical Range
N/A
Description
False = No skidmarks, True = Skidmarks.
List of existing physics materials and their properties can be seen in art/groundmodels.json in the game’s directory.
