It's just something about programming approach and various tricks. Advanced LOD system and procedural workflow can make miracles. Space Engine handles entire universe Yep, Unity3D doesn't provide advanced low-level access to model meshes and general rendering pipeline, but certainly it's still capable to achieve required effect. Journey between planets can take YEARS of real time, but it doesn't stop making gameplay fun So why extra 10 minutes of flight can so abruptly make game extremly tedious? Again, it's programming issues with time acceleration and physical engine (to wich, I suppose, you have only high-level access), and, probably, some game-design ones. Ok, just to summarize: there was a gameplay problem, and you solved it in this way. I'm still not conviced that that's the only way to solve it, but let it be so I'm not going to argue anymore. Thank you for very detailed explanation, even though it seems not the first time you are doing it. Now it all is a little bit clear for me. And, by the way, before creating new thread I've tried to search similar disscussion with various keywords, but didn't find anything relevant. If this topic hurts your feelings, I'm really sorry. Feel free to block it and ban me, for the great justice Best regards, Alex.