VR Simulated Gravity

As people explore deeper into space, we will need a rotating space craft to simulate gravity. However, there are many engineering problems that need to be solved for a rotating space craft, like where does the toilet go--in the rotating portion or the central part with very low to no simulated gravity? what happens when the supplies are moved around inside the rotating portion--lopsided rotation, faster, slower? One of the ways to solve some of these problems is with Virtual Reality simulations. Can you help NASA solve some of the engineering difficulties with a simulation showing how objects, fluids and the space craft behave when it is all rotating?