Today, 12:37 AM · 7 replies and 172 views.
I don't think you know what you are talking about. In your logic, my co-pilot should feel this "motion sickness" as well since he/she has no control of the ship, but they don't. In fact, I have been playing DCS and IL-2 semi-professionally in the past 12 years, and sometimes as gunner, I have never experienced any of your "motion sickness", nor have I heard anyone else who has.
No horizon means even more blurry back ground, means less "motion sickness". Skybox will be ignored during the play as the gunner's focus is either on the ship or the target. (besides, you so called "skybox" is just a blackground with some white dots anyway)
If you have a visual nerve issue, that is OK. But please don't presume everybody else has the same issue as you.
True motion sicknesses are usually caused by G force or other motions. The "motion sickness" you called is rather just a nerve issue where some people's visual nerve can't adjust focus fast enough to fit a 3D image and can't differentiate the simulated range and...