Type Method

dragField

Creates a field that slows any object in its area of effect with a force proportional to the object’s velocity.

Declaration

+ (SCNPhysicsField *)dragField;

Return Value

A physics field object. To use the field in a scene, attach it to the physicsField property of an SCNNode object.

Discussion

Like the damping and angularDamping properties of a physics body, drag fields can simulate effects such as fluid friction or air resistance. Unlike those properties, drag fields can simulate different intensities of fluid friction in different areas of your scene. For example, you can use a drag field to represent underwater areas.

The default falloffExponent value for a drag field is 0.0, indicating that the field’s effect is constant throughout its area of effect.

See Also

Creating Physics Fields

+ vortexField

Creates a field whose forces circulate around an axis.

+ radialGravityField

Creates a field that accelerates objects toward its center.

+ linearGravityField

Creates a field that accelerates objects in a specific direction.

+ noiseFieldWithSmoothness:animationSpeed:

Creates a field that applies random forces to objects in its area of effect.

+ turbulenceFieldWithSmoothness:animationSpeed:

Creates a field that applies random forces to objects in its area of effect, with magnitudes proportional to those objects’ velocities.

+ springField

Creates a field that pulls objects toward its center with a spring-like force.

+ electricField

Creates a field that attracts or repels objects based on their electrical charge and on their distance from the field’s center.

+ magneticField

Creates a field that attracts or repels objects based on their electrical charge, velocity, and distance from the field’s axis.