Not all sceneries have been modelled with different ground materials. We might add this in the future to those places.
OK, that's what I thought. I guess it may be a bit more difficult to model this with the 4D fields because most of them cover very large areas. I'm mainly flying VR in these 4D fields with 3D planes and Heli's so differences in ground materials is not very important to me right now anyway. It still would be good to have these in the future though.
Thanks for your reply and thanks to the developers for a great RC sim which I'm sure will continue to get better and better!