Instance Property


The rate at which the simulation executes.


@property(nonatomic) CGFloat speed;


The default value is 1.0, which means the simulation runs at normal speed. A value other than the default changes the rate at which time passes in the physics simulation. For example, a speed value of 2.0 indicates that time in the physics simulation passes twice as fast as the scene’s simulation time. A value of 0.0 pauses the physics simulation.

See Also

Configuring the Physics World


A vector that specifies the gravitational acceleration applied to physics bodies in the physics world.