That would imply the computer we are simulated on is isomorphic to the 3D universe it is simulating, i.e. that if A and B are close in the simulation, the storage for A and B are physically close in the simulator, and that the storage moves as the objects move. Otherwise the speed of light would vary from a place to another.
None of that matters if the simulation only has access to simulated time--e.g. a vm with access to a clocksource but not a 'real' time one.