World
constructor(gravity: Vec2 = Vec2(0f, -10f), restitutionThreshold: Float = 1.0f, hitEventThreshold: Float = 1.0f, contactHertz: Float = 30.0f, contactDampingRatio: Float = 10.0f, maxContactPushSpeed: Float = 3.0f, maximumLinearSpeed: Float = 400.0f, enableSleep: Boolean = true, enableContinuous: Boolean = true)