Hi Cless, sorry no currently there isn't any method set up in MoI to show the positive normal direction. I do want to add something for that in the future though.

One thing that can help is if you have created just individual surfaces that touch each other it is good to Join those together so they are larger connected objects. That way the whole connected piece will have a consistent normal direction and you shouldn't have lots of little ones to flip around in 3dsmax.

Also if you make your objects into a closed solid, that will automatically orient the normals to the outside of the solid volume.

- Michael