OptionalenableEnable body sleeping (default: true)
OptionalgravityGravity vector (default: { x: 0, y: 9.8 })
OptionalpixelsPixels per meter conversion (default: 30)
OptionalpositionPosition iterations for solver (default: 3)
OptionaltimestepFixed timestep in seconds (default: 1/60)
OptionalvelocityVelocity iterations for solver (default: 8)
PhysicsWorld configuration.