I have a few questions which I think all fit in this forum catagory, I hope.

First, I currently use 3D ewald with a extra long z box length for my interfacial simulations. Is there a better way of doing this?

Secondly, is there support for a fixed 180 degree angle between 3 atoms? With a fixed bond length as well.

And while I'm here, I'd like to be able to make Lennard Jones wall in say the xy plane using the 3-9 potential. As anyone done anything like this before?

Thanks for any help,