Physical Materials Reference

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Physical Materials are used to define the response of a physical object when interacting dynamically with the world. Physical Materials are fairly easy to use. Creating one will give you a set of default values, identical to the default physical material that is applied to all physics objects. Examples of this would be a character's dead body (ragdoll), a movable crate, and so on.

Properties

Below are the properties for Physical Materials separated by major category.

Physical Material

This category contains the core properties of the Physics Material: Friction, Restitution, and Density.

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Property

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Description

Friction

This is the friction value of the surface, which controls how easily things can slide on this surface.

Friction Combine Mode

This property enables you to adjust how Physical Material frictions are combined. This is set to Average by default, but can be overriden using the Override Friction Combine Mode property.

Average

Uses the average value of the touching materials: (a+b)/2

Min

Uses the smaller value of the touching materials: min(a,b)

Multiply

Multiplies the values of the touching materials: a*b

Max

Uses the larger value of the touching materials: max(a,b)

Override Friction Combine Mode

By default, the Friction Combine Mode is set to Average, by enabling this property you can change how Frictions are combined between touching Physical Materials.

Restitution

This is how "bouncy" the surface is, or how much energy it retains when it collides with another surface.

Restitution Combine Mode

This property enables you to adjust how Physical Material restitutions are combined. This is set to Average by default, but can be overriden using the Override Restitution Combine Mode property.

Average

Uses the average value of the touching materials: (a+b)/2

Min

Uses the smaller value of the touching materials: min(a,b)

Multiply

Multiplies the values of the touching materials: a*b

Max

Uses the larger value of the touching materials: max(a,b)

Override Restitution Combine Mode

By default, the Restitution Combine Mode is set to Average, by enabling this property you can change how Restitutions are combined between touching Physical Materials.

Density

Used with the shape of the object to calculate its mass properties. The higher the number, the heavier the object. Measured as g per cubic cm.