Interface IRunnerOptions

A Number that specifies the time step between updates in milliseconds. If engine.timing.isFixed is set to true, then delta is fixed. If it is false, then delta can dynamically change to maintain the correct apparent simulation speed.

A Boolean that specifies if the runner should use a fixed timestep (otherwise it is variable). If timing is fixed, then the apparent simulation speed will change depending on the frame rate (but behaviour will be deterministic). If the timing is variable, then the apparent simulation speed will be constant (approximately, but at the cost of determininism).