Thanks, that is helpful. The way I’ve done it at this point is that we can use the rotation of any arbitrary transform to set the sun direction, so you can use a directional light to drive it, no problem. I had not even specifically tested that yet, but hooking a directional light to bella’s sun, I get a shadow match between bella’s sun, and the directional light’s shadows in maya hardware renderer.
Regarding whether bella would crash with a maxwell scene or vice versa, there is nothing specifically related between the two plugins, but any time two plugins are in play, then at least in principle, one may ask maya to do something the other is not prepared for. I don’t have the maxwell plugin, but if you have a scene where you think there could be some conflict, I’d like to take a look.