Hi all,
it seems that you want to do something similar to what we did. You can take a look at our approach. I mentioned it on a previous post:
Our radio propagation simulator can be used as a Unity plugin. As mentioned here, simulation is separated from rendering. The code is using Optix 6.5, though. We are not really interesting in rendering, just simulation, so the plugin is not very efficient. We use Unity mainly to create the 3D scene that it is later loaded to the simulator. It can render the propagation paths (the method should be definitively changed) but it is enough for us because we use it just for debugging. Anyway, all of this may be useful to you to get started in your project.